1. A method of performing batch and semi batch separations in a separation system, the
method comprising:
a. receiving, by at least one reservoir, a system level feed solution from an
external source to initiate a first pass of a batch separation, wherein the batch separation
includes one or more pass level separations;
b. supplying, by the at least one reservoir, at least one of the system level feed
solution and a pass level retentate solution as a pass level feed solution to a first side of a
semi-permeable membrane of a separation unit;
c. exerting, by a pressurizing unit, a pressure on the pass level feed solution in
fluid communication with the first side of the semipermeable membrane such that a pass
level permeate solution from the pass level feed solution passes from the first side of the
semipermeable membrane to a second side of the semipermeable membrane of the
separation unit,
wherein the pressurizing unit includes at least one of an energy recovery device (ERD) device, a high-pressure pump, a booster pump, a piston, an hydraulic fluid and pneumatic fluid;
d. discharging, by the separation unit, a pass level retentate solution from the first
side of the semi-permeable membrane, on passing the pass level permeate solution from
the first side of the semipermeable membrane to the second side of the semipermeable
membrane, wherein the discharged pass level retentate solution is stored in one of the at
least one reservoir and supplied as the pass level feed solution to any of its subsequent
pass until a system level retentate solution is generated, wherein the pass level permeate
solution is removed as a system level permeate solution from the separation system; and
e. removing, by the separation unit in fluid communication with the at least one
reservoir and the pressurizing unit, the generated system level retentate solution from the
separation system.
2. The method as claimed in claim 1, wherein the method further comprises repeating,
by the separation system, steps (a-e) to continue with one or more subsequent batch
separations and semi batch separations.

3. The method as claimed in claim 1, wherein the method further comprises mixing a
system level process solution with a pass level process solution thereby achieving the
semi-batch separations,
wherein the system level process solution includes a system level feed solution, a system level permeate solution and a system level retentate solution,
wherein the pass level process solution includes a pass level feed solution, a pass level permeate solution and a pass level retentate solution.
4. The method as claimed in claim 1, wherein the method further comprises filling in parallel one of the at least one reservoir with a system level feed solution for the one or more subsequent separation cycles to achieve at least one of the batch separation and the semi batch separation.
5. The method as claimed in claim 1, wherein a reservoir switchover sequence is used to enable the separation system to switch connections to supply at least one of the pass level retentate solution and the pass level permeate solution stored in one of the at least one reservoir as the pass level feed solution to any of its subsequent pass, the reservoir switchover sequence comprises:
enabling different hydraulic segments of the separation system to replace the pass level feed solution, the pass level permeate solution and the pass level retentate solution corresponding to an earlier pass with a pass level feed solution, a pass level permeate solution and a pass level retentate solution of a next pass.
6. The method as claimed in claim 1, wherein the method further comprises collecting the pass level permeate solution in one of the at least one reservoir and supplying as a pass level feed solution to any of its subsequent pass until a system level permeate solution is generated.
7. The method as claimed in claim 1, wherein the pressure exerted on the pass level feed solution in fluid communication with the first side of the semipermeable membrane is maintained by at least one of varying pressurized boundaries of a liquid container enclosing the at least one reservoir, displacing a hydraulic fluid between the at least one

reservoir, adding hydraulic fluid to the at least one reservoir, transporting the pass level retentate solution and the pass level feed solution through the pressurizing unit to recover a portion of energy released by reducing the pressure of the pass level retentate solution and utilizing the recovered energy to pressurize the pass level feed solution.
8. The method as claimed in claim 7, wherein a process solution acts as the hydraulic fluid to maintain the pressure exerted on the pass level feed solution in fluid communication with first side of the semipermeable membrane, wherein the process solution includes at least one of the system level feed solution, the system level permeate solution, the system level retentate solution, the pass level feed solution, the pass level permeate solution and the pass level retentate solution.
9. The method as claimed in claim 1, wherein removing, by the separation system, the generated system level retentate solution comprises:
discharging the system level retentate solution to one of the at least one reservoir; isolating one of the at least one reservoir from the separation unit; depressurizing one of the at least one reservoir to an ambient pressure; and removing the generated system level retentate solution from and filling the system level feed solution in one of the at least one reservoir by at least one of a sequential process or by a simultaneous process.
10. The method as claimed in claim 1, wherein removing, by the separation system, the
generated system level retentate solution includes:
passing the generated system level retentate solution and the system level feed solution partially or completely of the subsequent batch separations and the semi batch separations through the ERD to recover a portion of energy released upon reducing a pressure in the generated system level retentate solution and utilizing the recovered energy to pressurize the system level feed solution, wherein the pressurized system level feed solution from the ERD is collected in one of the at least one reservoir; and
removing the system level retentate solution from the ERD on transferring the recovered energy to the system level feed solution.
11. The method as claimed in claim 1, wherein discharging the pass level retentate
solution from the first side of the semi-permeable membrane, comprises:

exerting, by the pressurizing unit, the pressure on the pass level feed solution on the first side of the semipermeable membrane to discharge the pass level retentate solution from the first side of the semi-permeable membrane and the pass level permeate solution from the second side of the semipermeable membrane; and
recovering, by the pressurizing unit, a portion of energy released upon depressurising the pass level retentate solution and utilizing the recovered energy to pressurize the pass level feed solution.
12. The method as claimed in claim 1, wherein the at least one reservoir comprises at
least one of:
an unpressurized liquid container;
a piston pressurized liquid container;
a piston pressurized liquid container with at least two chambers separated by at
least one movable partition, wherein the at least two chambers acts as two
different reservoirs;
an indirect hydraulically pressurized liquid container with at least two chambers
separated by at least one movable partition, wherein the at least two chambers
acts as two different reservoirs;
a direct hydraulically pressurized liquid container with the hydraulic fluid,
wherein the hydraulic fluid is in direct fluid communication with the process
solution in the reservoir;
a direct feed pressurized reservoir;
an unpressurized liquid container with at least two chambers separated by at least
one movable partition, wherein the at least two chambers acts as two different
reservoirs;
an unpressurized liquid container with at least one chamber enclosed by a
bladder, wherein the at least one chamber acts as a reservoir and includes one or
more connections for supplying and receiving the process solutions; and
a pressurized liquid container with at least one chamber enclosed by a bladder.
wherein the at least one chamber acts as a reservoir and includes one or more
connections for supplying and receiving the process solutions.

13. The method as claimed in claim 1, wherein at least one of the generated system level retentate solution from a batch separation is used as the system level feed solution to another batch separation and the generated system level permeate solution from the batch separation is used as the system level feed solution to another batch separation.
14. The method as claimed in claim 1, wherein the semipermeable membrane used is at least one of a reverse osmosis membrane, a nanofiltration membrane and an ultrafiltration membrane.
15. A method of performing batch and semi batch separations in a separation system, the method comprising:
a. receiving, by the separation system, a system level feed solution to at least one
feed side reservoir and a system level draw solution to at least one draw side
reservoir to initiate a first pass of a batch separation, wherein the batch separation
includes one or more pass level separations, wherein the system level draw solution
having a higher osmotic pressure than an osmotic pressure of the system level feed
solution;
b. supplying, by the at least one feed side reservoir, one of the system level feed
solution and a pass level retentate solution as a pass level feed solution to a first side
of a semi- permeable membrane of a separation unit;
c. supplying, by the at least one draw side reservoir, one of the system level draw
solution and a pass level diluate draw solution as a pass level draw solution to a
second side of a semi- permeable membrane of the separation unit, wherein the pass
level draw solution having a higher osmotic pressure than an osmotic pressure of the
pass level feed solution;
d. discharging, by the separation unit, a pass level retentate solution from the first
side of the semi-permeable membrane and a pass level diluate draw solution from
the second side of the semi permeable membrane, on extracting a pass level
permeate solution having a lower osmotic pressure than the osmotic pressure of pass
level draw solution by the pass level draw solution to the second side of the
semipermeable membrane, wherein the discharged pass level retentate solution is
stored in one of the at least one feed side reservoir and supplied as the pass level
feed solution to any of its subsequent pass until a system level retentate solution is

generated, wherein the discharged pass level diluate draw solution is stored in one of
the at least one draw side reservoir and supplied as the pass level draw solution to
any of its subsequent pass until a system level diluate draw solution is generated;
and
e. removing, by the separation unit in fluid communication with the at least one
reservoir, the generated system level retentate solution and the system level diluate
draw solution from the separation system.
16. The method as claimed in claim 15, wherein the method further comprises repeating, by the separation system, steps (a-e) to continue with one or more subsequent batch separations and semi batch separations.
17. The method as claimed in claim 15, wherein the method further comprises mixing a system level process solution with a pass level process solution thereby achieving the semi-batch separations,
wherein the system level process solution includes a system level feed solution, a system level draw solution and a system level retentate solution and system level diluate draw solution,
wherein the pass level process solution includes a pass level feed solution, a pass level draw solution and a pass level retentate solution and a pass level diluate draw solution.
18. The method as claimed in claim 15, wherein the method further comprises filling in parallel the one of the at least one feed side reservoir and one of the at least one draw side reservoir with the system level feed solution and the system level draw solution respectively for the one or more subsequent separation cycles to achieve at least one of the batch separation and the semi batch separation.
19. The method as claimed in claim 15, wherein a reservoir switchover sequence is used to enable the separation system to switch connections to supply one of the system level feed solution and the pass level retentate solution stored in one of the at least one feed side reservoir as the pass level feed solution and to supply one of the system level draw solution and the pass level diluate draw solution stored in one of the at least one
SPTP-000600IN -105-

draw side reservoir as the pass level draw solution to any of its subsequent pass, the reservoir switchover sequence comprises:
enabling different hydraulic segments of the separation system to replace the pass level feed solution, the pass level draw solution, the pass level retentate solution and the pass level diluate draw solution corresponding to an earlier pass with a pass level feed solution, a pass level draw solution, a pass level retentate solution and a pass level diluate draw solution of a next pass.
20. The method as claimed in claim 15, wherein the separation system is an osmotically driven separation system.
21. The method as claimed in claim 15, wherein a flow of the feed solution on the first side of the membrane and a flow of the draw solution on the second side of the membrane are one of a counter current, a co-current and a cross-current to each other.
22. The method as claimed in claim 15, wherein one of the generated system level retentate solution from one batch separation or semi batch separation is used as system level feed solution to another batch separation or semi batch separation and the generated system level diluate draw solution from one batch separation or semi batch separation is used as a system level draw solution to another batch separation or semi batch separation.
23. A separation system for performing batch and semi batch separations, the separation system comprising:
at least one reservoir configured to:
a. receive a system level feed solution from an external source to initiate
a first pass of a batch separation, wherein the batch separation
includes one or more pass level separations;
b. supply at least one of the system level feed solution and a pass level
retentate solution as a pass level feed solution to a first side of a semi¬
permeable membrane of a separation unit.
a pressurizing unit configured to:

c. exert a pressure on the pass level feed solution in fluid communication
with the first side of the semipermeable membrane such that a pass
level permeate solution from the pass level feed solution passes from
the first side of the semipermeable membrane to a second side of the
semipermeable membrane of the separation unit,
wherein the pressurizing unit includes at least one of an energy recovery device (ERD) device, an high pressure pump, a booster pump, a piston, an hydraulic fluid and pneumatic fluid; the separation unit configured to:
d. discharge a pass level retentate solution from the first side of the semi¬
permeable membrane, on passing the pass level permeate solution to
the second side of the semipermeable membrane, wherein the
discharged pass level retentate solution is stored in one of the at least
one reservoir and supplied as the pass level feed solution to any of its
subsequent pass until a system level retentate solution is generated,
wherein the pass level permeate solution is removed as a system level
permeate solution; and
the separation unit in fluid communication with the at least one reservoir and the pressurizing unit configured to:
e. remove the generated system level retentate solution.
24. The separation system as claimed in claim 23, wherein the separation system configured to repeat the steps (a-e) to continue with one or more subsequent batch separations and semi batch separations.
25. The separation system as claimed in claim 23, wherein the separation system is configured to mix a system level process solution with a pass level process solution thereby achieving the semi-batch separations,
wherein the system level process solution includes a system level feed solution, a system level permeate solution and a system level retentate solution,
wherein the pass level process solution includes a pass level feed solution, a pass level permeate solution and a pass level retentate solution.

26. The separation system as claimed in claim 23, wherein the separation system configured for parallel filling of one of the at least one reservoir with a system level feed solution for the one or more subsequent separation cycles to achieve at least one of the batch separation and the semi batch separation.
27. The separation system as claimed in claim 23, wherein the separation system configured to enable a reservoir switchover sequence to switch connections to supply at least one of the pass level retentate solution and the pass level permeate solution stored in one of the at least one reservoir as the pass level feed solution to any of its subsequent pass by:
enabling different hydraulic segments of the separation system to replace the pass level feed solution, the pass level permeate solution and the pass level retentate solution corresponding to an earlier pass with a pass level feed solution, a pass level permeate solution and a pass level retentate solution of a next pass.
28. The separation system as claimed in claim 23, wherein the separation system
configured to collect the pass level permeate solution in one of the at least one reservoir
and supply as the pass level feed solution to any of its subsequent pass until a system
level permeate solution is generated.
29. The separation system as claimed in claim 23, wherein the pressure exerted on the pass level feed solution in fluid communication with the first side of the semipermeable membrane is maintained by at least one of varying pressurized boundaries of a liquid container enclosing the at least one reservoir, displacing a hydraulic fluid between the at least one reservoir, adding hydraulic fluid to the at least one reservoir, transporting the pass level retentate solution and the pass level feed solution through the pressurizing unit to recover a portion of energy released by reducing the pressure of the pass level retentate solution and utilizing the recovered energy to pressurize the pass level feed solution.
30. The separation system as claimed in claim 29, wherein a process solution acts as the hydraulic fluid to maintain the pressure exerted on the pass level feed solution in fluid

communication with first side of the semipermeable membrane, wherein the process solution includes at least one of the system level feed solution, the system level permeate solution, the system level retentate solution, the pass level feed solution, the pass level permeate solution and the pass level retentate solution.
31. The separation system as claimed in claim 23, wherein the separation system
configured to remove the generated system level retentate solution by:
discharging the system level retentate solution to one of the at least one reservoir;
isolating the at least one reservoir from the separation unit;
depressurizing one of the at least one reservoir to an ambient pressure; and
removing the generated system level retentate solution from and filling the system level feed solution in one of the at least one reservoir by at least one of a sequential process or by a simultaneous process.
32. The separation system as claimed in claim 23, wherein the separation system
configured to remove the generated system level retentate solution by:
passing the generated system level retentate solution and the system level feed solution partially or completely of the subsequent batch separations and the semi batch separations through the ERD to recover a portion of energy released upon reducing a pressure in the generated system level retentate solution and utilizing the recovered energy to pressurize the system level feed solution, wherein the pressurized system level feed solution from the ERD is collected in one of the at least one reservoir; and
removing the system level retentate solution from the ERD on transferring the recovered energy to the system level feed solution.
33. The separation system as claimed in claim 23, wherein the separation unit
configured to discharge a pass level retentate solution from the first side of the semi¬
permeable membrane by:
configuring the pressurizing unit to exert a pressure on the pass level feed solution on the first side of the semipermeable membrane to discharge the pass level retentate solution from the first side of the semi-permeable membrane and a pass level permeate solution from the second side of the semipermeable membrane; and

configuring the pressurizing unit to recover a portion of energy released upon depressurising the pass level retentate solution and utilizing the recovered energy to pressurize the pass level feed solution.
34. The separation system as claimed in claim 23, wherein the at least one reservoir
comprises at least one of:
an unpressurized liquid container;
a piston pressurized liquid container;
a piston pressurized liquid container with at least two chambers separated by at
least one movable partition, wherein the at least two chambers acts as two
different reservoirs;
an indirect hydraulically pressurized liquid container with at least two chambers
separated by at least one movable partition;
a direct hydraulically pressurized liquid container with the hydraulic fluid in
direct fluid communication with the process solution in the reservoir;
a direct feed pressurized reservoir;
an unpressurized liquid container with at least two chambers separated by at least
one movable partition, wherein the atleast two chambers acts as two different
reservoirs;
an unpressurized liquid container with at least one chamber enclosed by a
bladder, wherein the at least one chamber acts as a reservoir and includes one or
more connections for supplying and receiving the process solutions; and
a pressurized liquid container with at least one chamber enclosed by a bladder,
wherein the at least one chamber acts as a reservoir and includes one or more
connections for supplying and receiving the process solutions.
35. The separation system as claimed in claim 23, wherein at least one of the generated
system level retentate solution from a batch separation is used as the system level feed
solution to another batch separation and the generated system level permeate solution
from the batch separation is used as the system level feed solution to the another batch
separation.

36. The separation system as claimed in claim 23, wherein the semipermeable membrane used is at least one of a reverse osmosis membrane, a nanofiltration membrane and an ultrafiltration membrane.
37. A separation system for performing batch and semi batch separations, the separation system comprising:
at least one feed side reservoir configured to:
a. receive a system level feed solution to the at least one feed side reservoir
and supply one of the system level feed solution and a pass level retentate
solution as a pass level feed solution to a first side of a semi- permeable
membrane of a separation unit for a batch separation, wherein the batch
separation includes one or more pass level separations, wherein the system
level draw solution having a higher osmotic pressure than an osmotic
pressure of the system level feed solution;
at least one draw side reservoir configured to:
b. receive a system level draw solution to at least one draw side reservoir
for the batch separation and supply one of the system level draw solution
and a pass level diluate draw solution as a pass level draw solution to a
second side of a semi- permeable membrane of the separation unit, wherein
the system level draw solution having a higher osmotic pressure than an
osmotic pressure of the system level feed solution;
the separation unit configured to:
c. discharge a pass level retentate solution from the first side of the semi¬
permeable membrane and a pass level diluate draw solution from the
second side of the semi permeable membrane, on extracting a pass level
permeate solution having a lower osmotic pressure than the osmotic
pressure of pass level draw solution by the pass level draw solution to the
second side of the semipermeable membrane, wherein the discharged pass
level retentate solution is stored in one of the at least one feed side reservoir
and supplied as the pass level feed solution to any of its subsequent pass
until a system level retentate solution is generated, wherein the discharged
pass level diluate draw solution is stored in one of the at least one draw side

reservoir and supplied as the pass level draw solution to any of its subsequent pass until a system level diluate draw solution is generated; and the separation unit in fluid communication with the at least one reservoir, configured to: d. remove the generated system level retentate solution and the system level diluate draw solution from the separation system.
38. The separation system as claimed in claim 37, wherein the separation system further configured to repeat the steps (a-d) to continue with one or more subsequent batch separations and semi batch separations.
39. The separation system as claimed in claim 37, wherein the separation system configured to mix a system level process solution with a pass level process solution thereby achieving the semi-batch separations,
wherein the system level process solution includes a system level feed solution, a system level draw solution and a system level retentate solution and system level diluate draw solution,
wherein the pass level process solution includes a pass level feed solution, a pass level draw solution and a pass level retentate solution and a pass level diluate draw solution.
40. The separation system as claimed in claim 37, wherein the separation system configured to fill in parallel one of the at least one feed side reservoir and one of the at least one draw side reservoir with a system level feed solution and the system level draw solution for the one or more subsequent separation cycles to achieve at least one of the batch separation and the semi batch separation.
41. The separation system as claimed in claim 37, wherein the separation system configured to enable a reservoir switchover to switch connections to supply one of the system level feed solution and the pass level retentate solution stored in one of the at least one feed side reservoir as the pass level feed solution and to supply one of the system level draw solution and the pass level diluate draw solution stored in one of the at least one draw side reservoir as the pass level draw solution to any of its subsequent pass by:

enabling different hydraulic segments of the separation system to replace the pass level feed solution, the pass level draw solution, the pass level retentate solution and the pass level diluate draw solution corresponding to an earlier pass with a pass level feed solution, a pass level draw solution, a pass level retentate solution and a pass level diluate draw solution of a next pass.
42. The separation system as claimed in claim 37, wherein the separation system is an osmotically driven separation system.
43. The separation system as claimed in claim 37, wherein a flow of the feed solution on the first side of the membrane and a flow of the draw solution on the second side of the membrane are one of a counter current, a co-current and a cross-current to each other.
44. The separation system as claimed in claim 37, wherein one of the generated system level retentate solution from one batch separation or semi batch separation is used as system level feed solution to another batch separation or semi batch separation and the generated system level diluate draw solution from one batch separation or semi batch separation is used as a system level draw solution to another batch separation or semi batch separation.
45. A method of performing batch and semi batch separations in a separation system, the method comprising:
a. receiving, by a at least one feed side reservoir, a system level feed solution and
supplying as a pass level feed solution to the first side of the semi permeable
membrane for a first pass of a first batch; and
b. supplying, by the at least one draw side reservoir, a pass level draw solution
having a higher osmotic pressure than an osmotic pressure of the pass level feed
solution corresponding to the first pass to the second side of the semi permeable
membrane;
c. discharging, by the separation unit, a pass level retentate solution from the first
side of the semi-permeable membrane and the pass level diluate draw solution
from the second side of the semi permeable membrane, on extracting a pass level
permeate solution having a lower osmotic pressure than the osmotic pressure of

pass level draw solution by the pass level draw solution from the first side of the semipermeable membrane to the second side of the semipermeable membrane,
wherein the discharged pass level retentate solution is stored in one of the at least one feed side reservoir and supplied as the pass level feed solution to any of its subsequent pass,
wherein the discharged pass level diluate draw solution is removed as a system level diluate draw solution;
d. supplying, by the at least one feed side reservoir, a pass level retentate produced
in the first pass as a pass level feed solution to the first side of the semi permeable
membrane for a second pass;
e. supplying by the at least one draw side reservoir, a pass level draw solution
corresponding to the second pass, to the second side of the semi permeable
membrane, wherein the pass level draw solution having a higher osmotic pressure
than an osmotic pressure of the pass level feed solution;
f discharging, by the separation unit, a pass level retentate solution from the first side of the semi-permeable membrane and the pass level diluate draw solution from the second side of the semi permeable membrane corresponding to the second pass, on extracting a pass level permeate solution having a lower osmotic pressure than the osmotic pressure of pass level draw solution by the pass level draw solution from the first side of the semipermeable membrane to the second side of the semipermeable membrane,
wherein the discharged pass level retentate solution is stored in one of the at least one feed side reservoir and supplied as the pass level feed solution to a third pass,
wherein the discharged pass level diluate draw solution is stored in one of the at least one draw side reservoir and supplied as the pass level draw solution to a first pass of a second batch;
g. repeating steps (d-f) for further passes till pass n-1 of the first batch to produce a pass level retentate of pass n-1, wherein the discharged pass level diluate draw solution of every pass of the first batch is stored in one of the at least one draw side reservoir and supplied as the pass level draw solution to an earlier pass of a second batch;

h. supplying the pass level retentate of pass n-1 as a pass level feed solution to the first side of the semi permeable membrane for a pass n; and
i. receiving and supplying, by the at least one draw side reservoir, a system level draw solution having a higher osmotic pressure than the osmotic pressure of the pass level feed solution of the pass n in step h as a pass level draw solution to the second side of the semi permeable membrane;
j. discharging, by the separation unit, a pass level retentate solution from the first side of the semi-permeable membrane and the pass level diluate draw solution from the second side of the semi permeable membrane, on extracting a pass level permeate solution having a lower osmotic pressure than the osmotic pressure of pass level draw solution by the pass level draw solution from the first side of the semipermeable membrane to the second side of the semipermeable membrane,
wherein the discharged pass level retentate solution is removed as system level retentate solution,
wherein the discharged pass level diluate draw solution is stored in one of the at least one draw side reservoir and supplied as pass level draw solution to n-1 pass of the second batch;
k. repeating the steps, a-j for further batches, wherein the system level feed solution and system level draw solution are converted to corresponding system level retentate solution and a system level diluate draw solution.
46. The method as claimed in claim 45, wherein the method comprise receiving and supplying by the at least one draw side reservoir a system level draw solution as a pass level draw solution corresponding to the second pass, to the to second side of the semi permeable membrane and removing the discharged pass level retentate solution corresponding to the second pass, from the first side of the semi-permeable membrane as a system level retentate when a batch consists of maximum of two passes, wherein the pass level draw solution having a higher osmotic pressure than an osmotic pressure of the pass level feed solution.
47. The method as claimed in claim 45, wherein the method further comprises mixing a system level process solution with a pass level process solution thereby achieving a semi-batch separation,

wherein the system level process solution includes a system level feed solution, a system level draw solution, a system level retentate solution and a system level diluate draw solution,
wherein the pass level process solution includes a pass level feed solution, a pass level draw solution, a pass level retentate solution and a pass level diluate draw solution.
48. The method as claimed in claim 45, wherein the method further comprises filling in parallel the at least one feed side reservoir with a system level feed solution and the at least one draw side reservoir with a system level draw solution for the one or more subsequent separation cycles to achieve at least one of the batch separation and the semi batch separation.
49. The method as claimed in claim 45, wherein a reservoir switchover sequence is used to enable the separation system to switch connections to supply one of the system level feed solution and the pass level retentate solution stored in one of the at least one feed side reservoir and one of the system level draw solution and the pass level diluate draw solution stored in one of the at least one draw side reservoir as the pass level feed solution and the pass level draw solution respectively having a higher osmotic pressure than an osmotic pressure of pass level feed solution to any of its subsequent pass, the reservoir switchover sequence comprises:
enabling different hydraulic segments of the separation system to replace the pass level feed solution, the pass level draw solution, the pass level retentate solution and the pass level diluate draw solution corresponding to an earlier pass with a pass level feed solution, a pass level draw solution, a pass level retentate solution and a pass level diluate draw solution of a next pass.
50. The method as claimed in claim 45, wherein the flow of feed solution on the first
side of the semipermeable membrane and the flow of draw solution on the second side of
the semipermeable membrane are one of counter current, co-current and cross-current to
each other.

51. The method as claimed in claim 45, wherein at least one of the generated system
level retentate solution from one batch separation or semi batch separation is used as
system level feed solution to another batch separation or semi batch separation and the
generated system level diluate draw solution from one batch separation or semi batch
separation is used as system level draw solution to another batch separation or semi
batch separation.
52. A separation system for performing batch and semi batch separations, the separation
system comprising:
at least one feed side reservoir configured to:
a. receive a system level feed solution and supplying as a pass level feed
solution to the first side of the semi- permeable membrane for a first pass
of a first batch; and
at least one draw side reservoir configured to:
b. supply a pass level draw solution having a higher osmotic pressure than
an osmotic pressure of pass level feed solution corresponding to the first
pass to the second side of the semi- permeable membrane;
a separation unit configured to:
c. discharge a pass level retentate solution from the first side of the semi¬
permeable membrane and the pass level diluate draw solution from the
second side of the semi permeable membrane, on extracting a pass level
permeate solution having a lower osmotic pressure than the osmotic
pressure of pass level draw solution by the pass level draw solution from
the first side of the semipermeable membrane to the second side of the
semipermeable membrane,
wherein the discharged pass level retentate solution is stored in one of the at least one feed side reservoir and supplied as the pass level feed solution to any of its subsequent pass,
wherein the discharged pass level diluate draw solution is removed as a system level diluate draw solution, the at least one feed side reservoir configured to:

d. supply a pass level retentate produced in the first pass as a pass level
feed solution to the first side of the semi- permeable membrane for a
second pass;
the at least one draw side reservoir configured to:
e. supply a pass level draw solution corresponding to the second pass, to
the second side of the semi permeable membrane, wherein the pass level
draw solution having a higher osmotic pressure than an osmotic pressure
of pass level feed solution;
the separation unit configured to:
f discharge a pass level retentate solution from the first side of the semi-permeable membrane and the pass level diluate draw solution from the second side of the semi permeable membrane corresponding to the second pass, on extracting a pass level permeate solution having a lower osmotic pressure than the osmotic pressure of pass level draw solution by the pass level draw solution from the first side of the semipermeable membrane to the second side of the semipermeable membrane,
wherein the discharged pass level retentate solution is stored in one of the at least one feed side reservoir and supplied as the pass level feed solution to a third pass,
wherein the discharged pass level diluate draw solution is stored in one of the at least one draw side reservoir and supplied as the pass level draw solution to a first pass of a second batch;
g. repeating steps (d-f) for further passes till pass n-1 of the first batch to produce a pass level retentate of pass n-1, wherein the discharged pass level diluate draw solution of every pass of the first batch is stored in one of the at least one draw side reservoir and supplied as the pass level draw solution to an earlier pass of a second batch;
the at least one feed side reservoir configured to:
h. supply the pass level retentate of pass n-1 as a pass level feed solution to the first side of the semi permeable membrane for a pass n; and
the at least one draw side reservoir configured to:

i.receive and supply a system level draw solution as a pass level draw solution having a higher osmotic pressure than an osmotic pressure of pass level feed solution of the pass n in step h as a pass level draw solution to the second side of the semi permeable membrane;
the separation unit configured to:
j.discharge a pass level retentate solution from the first side of the semi-permeable membrane and the pass level diluate draw solution from the second side of the semi permeable membrane, on extracting a pass level permeate solution having a lower osmotic pressure than the osmotic pressure of pass level draw solution by the pass level draw solution from the first side of the semipermeable membrane to the second side of the semipermeable membrane,
wherein the discharged pass level retentate solution is removed as system level retentate solution,
wherein the discharged pass level diluate draw solution is stored in one of the at least one draw side reservoir and supplied as pass level draw solution to n-1 pass of the second batch;
k. repeat the steps a-j for further batches, wherein the system level feed solution and system level draw solution are converted to corresponding system level retentate solution and a system level diluate draw solution.
53. The separation system as claimed in claim 52, wherein the at least one draw side reservoir configured to receive and supply a system level draw solution as a pass level draw solution corresponding to the second pass, to the second side of the semi permeable membrane and removing the discharged pass level retentate solution corresponding to the second pass, from the first side of the semi-permeable membrane as a system level retentate when a batch consists of maximum of two passes, wherein the pass level draw solution having a higher osmotic pressure than an osmotic pressure of the pass level feed solution.

54. The separation system as claimed in claim 52, wherein the separation system
further configured to mix a system level process solution with a pass level process
solution thereby achieving a semi-batch separation,
wherein the system level process solution includes a system level feed solution, a system level draw solution, a system level retentate solution and a system level diluate draw solution,
wherein the pass level process solution includes a pass level feed solution, a pass level draw solution, a pass level retentate solution and a pass level diluate draw solution.
55. The separation system as claimed in claim 52, wherein the separation system further configured for parallel filling the at least one feed side reservoir with a system level feed solution and the at least one draw side reservoir with a system level draw solution for the one or more subsequent separation cycles to achieve at least one of the batch separation and the semi batch separation.
56. The separation system as claimed in claim 52, wherein the separation system further configured to enable a reservoir switchover sequence to switch connections to supply one of the system level feed solution and the pass level retentate solution stored in one of the at least one feed side reservoir and one of the system level draw solution and the pass level diluate draw solution stored in one of the at least one draw side reservoir as the pass level feed solution and the pass level draw solution having a higher osmotic pressure than an osmotic pressure of pass level feed solution to any of its subsequent pass by:
enabling different hydraulic segments of the separation system to replace the pass level feed solution, the pass level draw solution, the pass level retentate solution and the pass level diluate draw solution corresponding to an earlier pass with a pass level feed solution, a pass level draw solution, a pass level retentate solution and a pass level diluate draw solution of a next pass.
57. The separation system as claimed in claim 52, wherein the flow of feed solution
on the first side of the semipermeable membrane and the flow of draw solution on the

second side of the semipermeable membrane are one of counter current, co-current and cross-current to each other.
58. The separation system as claimed in claim 52, wherein at least one of the generated
system level retentate solution from one batch separation or semi batch separation is
used as system level feed solution to another batch separation or semi batch separation
and the generated system level diluate draw solution from one batch separation or semi
batch separation is used as system level draw solution to another batch separation or
semi batch separation.
59. A method of performing batch and semi batch separations in a separation system,
the method comprising:
a. receiving, by a at least one draw side reservoir, a system level draw solution and
supplying as a pass level draw solution to the second side of the semi permeable
membrane for a first pass of a first batch; and
b. supplying, by the at least one feed side reservoir, a pass level feed solution
having a lower osmotic pressure than an osmotic pressure of the pass level draw
solution corresponding to the first pass to the first side of the semi permeable
membrane;
c. discharging, by the separation unit, a pass level retentate solution from the first
side of the semi-permeable membrane and the pass level diluate draw solution
from the second side of the semi permeable membrane, on extracting a pass level
permeate solution having a lower osmotic pressure than the osmotic pressure of
pass level draw solution by the pass level draw solution from the first side of the
semipermeable membrane to the second side of the semipermeable membrane,
wherein the discharged pass level retentate solution is removed as a system level retentate solution,
wherein the discharged pass level diluate draw solution is stored in one of the at least one draw side reservoir and supplied as the pass level draw solution to any of its subsequent pass;
d. supplying, by the at least one draw side reservoir, a pass level diluate draw
solution produced in the first pass as a pass level draw solution to the second side
of the semi permeable membrane for a second pass;

e. supplying by the at least one feed side reservoir, a pass level feed solution corresponding to the second pass, to the first side of the semi permeable membrane , wherein the pass level feed solution having a lower osmotic pressure than an osmotic pressure of the pass level draw solution;
f discharging, by the separation unit, a pass level retentate solution from the first side of the semi-permeable membrane and the pass level diluate draw solution from the second side of the semi permeable membrane corresponding to the second pass, on extracting a pass level permeate solution having a lower osmotic pressure than the osmotic pressure of pass level draw solution by the pass level draw solution from the first side of the semipermeable membrane to the second side of the semipermeable membrane,
wherein the discharged pass level retentate solution is stored in one of the at least one feed side reservoir and supplied as the pass level feed solution to a first pass of a second batch,
wherein the discharged pass level diluate draw solution is stored in one of the at least one draw side reservoir and supplied as the pass level draw solution to a third pass;
g. repeating steps (d-f) for further passes till pass n-1 of the first batch to produce a pass level diluate draw of pass n-1, wherein the discharged pass level retentate solution of every pass of the first batch is stored in one of the at least one feed side reservoir and supplied as the pass level feed solution to an earlier pass of a second batch;
h. supplying the pass level diluate draw of pass n-1 as a pass level draw solution to the second side of the semi permeable membrane for a pass n; and
i. receiving and supplying, by the at least one feed side reservoir, a system level feed solution having a lower osmotic pressure than the osmotic pressure of the pass level draw solution of the pass n in step h as a pass level feed solution to the first side of the semi permeable membrane;
j. discharging, by the separation unit, a pass level retentate solution from the first side of the semi-permeable membrane and the pass level diluate draw solution from the second side of the semi permeable membrane, on extracting a pass level permeate solution having a lower osmotic pressure than the osmotic pressure of

pass level draw solution by the pass level draw solution from the first side of the semipermeable membrane to the second side of the semipermeable membrane,
wherein the discharged pass level retentate solution is stored in one of the at least one feed side reservoir and supplied as pass level feed solution to n-1 pass of the second batch,
wherein the discharged pass level diluate draw solution is removed as system level diluate draw solution; k. repeating the steps, a-j for further batches, wherein the system level feed solution and system level draw solution are converted to corresponding system level retentate solution and a system level diluate draw solution.
60. The method as claimed in claim 59, wherein the method comprises receiving and supplying by the at least one feed side reservoir a system level feed solution as a pass level feed solution corresponding to the second pass, to the first side of the semi permeable membrane and removing the discharged pass level diluate draw solution corresponding to the second pass, from the second side of the semi pemeable membrane as a system level diluate draw solution when a batch consists of maximum of two passes, wherein the pass level draw solution having a higher osmotic pressure than an osmotic pressure of the pass level feed solution.
61. The method as claimed in claim 59, wherein the method further comprises mixing a system level process solution with a pass level process solution thereby achieving a semi-batch separation,
wherein the system level process solution includes a system level feed solution, a system level draw solution, a system level retentate solution and a system level diluate draw solution,
wherein the pass level process solution includes a pass level feed solution, a pass level draw solution, a pass level retentate solution and a pass level diluate draw solution.
62. The method as claimed in claim 59, wherein the method further comprises filling
in parallel the at least one feed side reservoir with a system level feed solution and the at
least one draw side reservoir with a system level draw solution for the one or more

subsequent separation cycles to achieve at least one of the batch separation and the semi batch separation.
63. The method as claimed in claim 59, wherein a reservoir switchover sequence is
used to enable the separation system to switch connections to supply one of the system
level feed solution and the pass level retentate solution stored in one of the at least one
feed side reservoir and one of the system level draw solution and the pass level diluate
draw solution stored in one of the at least one draw side reservoir as the pass level feed
solution and the pass level draw solution respectively having a higher osmotic pressure
than an osmotic pressure of pass level feed solution to any of its subsequent pass, the
reservoir switchover sequence comprises:
enabling different hydraulic segments of the separation system to replace the pass level feed solution, the pass level draw solution, the pass level retentate solution and the pass level diluate draw solution corresponding to an earlier pass with a pass level feed solution, a pass level draw solution, a pass level retentate solution and a pass level diluate draw solution of a next pass.
64. The method as claimed in claim 59, wherein the flow of feed solution on the first side of the semipermeable membrane and the flow of draw solution on the second side of the semipermeable membrane are one of counter current, co-current and cross-current to each other.
65. The method as claimed in claim 59, wherein at least one of the generated system level retentate solution from one batch separation or semi batch separation is used as system level feed solution to another batch separation or semi batch separation and the generated system level diluate draw solution from one batch separation or semi batch separation is used as system level draw solution to another batch separation or semi batch separation.
66. A separation system for performing batch and semi batch separations, the separation
system comprising:
at least one draw side reservoir configured to:

a. receive a system level draw solution and supplying as a pass level draw
solution to the second side of the semi- permeable membrane for a first
pass of a first batch; and
at least one feed side reservoir configured to:
b. supply a pass level feed solution having a lower osmotic pressure than
an osmotic pressure of pass level draw solution corresponding to the first
pass to the first side of the semi- permeable membrane;
a separation unit configured to:
c. discharge a pass level retentate solution from the first side of the semi¬
permeable membrane and the pass level diluate draw solution from the
second side of the semi permeable membrane, on extracting a pass level
permeate solution having a lower osmotic pressure than the osmotic
pressure of pass level draw solution by the pass level draw solution from
the first side of the semipermeable membrane to the second side of the
semipermeable membrane,
wherein the discharged pass level retentate solution is removed as a system level retentate solution,
wherein the discharged pass level diluate draw solution is stored in one of the at least one draw side reservoir and supplied as the pass level draw solution to any of its subsequent pass; the at least one draw side reservoir configured to:
d. supply a pass level diluate draw solution produced in the first pass as a
pass level draw solution to the second side of the semi- permeable
membrane for a second pass;
the at least one feed side reservoir configured to:
e. supply a pass level feed solution corresponding to the second pass, to
the first side of the semi permeable membrane, wherein the pass level feed
solution having a lower osmotic pressure than an osmotic pressure of pass
level draw solution;
the separation unit configured to:

f. discharge a pass level retentate solution from the first side of the semi¬
permeable membrane and the pass level diluate draw solution from the
second side of the semi permeable membrane corresponding to the second
pass, on extracting a pass level permeate solution having a lower osmotic
pressure than the osmotic pressure of pass level draw solution by the pass
level draw solution from the first side of the semipermeable membrane to
the second side of the semipermeable membrane,
wherein the discharged pass level retentate solution is stored in one of the at least one feed side reservoir and supplied as the pass level feed solution to a first pass of a second batch,
wherein the discharged pass level diluate draw solution is stored in one of the at least one draw side reservoir and supplied as the pass level draw solution to a third pass;
g. repeating steps (d-f) for further passes till pass n-1 of the first batch to
produce a pass level diluate draw of pass n-1, wherein the discharged pass
level retentate solution of every pass of the first batch is stored in one of
the at least one feed side reservoir and supplied as the pass level feed
solution to an earlier pass of a second batch;
the at least one draw side reservoir configured to:
h. supply the pass level diluate draw of pass n-1 as a pass level draw solution to the second side of the semi permeable membrane for a pass n; and
the at least one feed side reservoir configured to:
i.receive and supply a system level feed solution having a lower osmotic pressure than an osmotic pressure of pass level draw solution of the pass n in step h as a pass level feed solution to the second side of the semi permeable membrane;
the separation unit configured to:
j.discharge a pass level retentate solution from the first side of the semi-permeable membrane and the pass level diluate draw solution from the second side of the semi permeable membrane, on extracting a pass level permeate solution having a lower osmotic pressure than the osmotic

pressure of pass level draw solution by the pass level draw solution from the first side of the semipermeable membrane to the second side of the semipermeable membrane,
wherein the discharged pass level retentate solution is stored in one of the at least one feed side reservoir and supplied as pass level feed solution to n-1 pass of the second batch,
wherein the discharged pass level diluate draw solution is removed as system level diluate draw solution;
k. repeat the steps a-j for further batches, wherein the system level feed solution and system level draw solution are converted to corresponding system level retentate solution and a system level diluate draw solution.
67. The separation system as claimed in claim 66, wherein the at least one feed side reservoir configured to receive and supply a system level feed solution as a pass level feed solution corresponding to the second pass, to the first side of the semi permeable membrane and removing the discharged pass level diluate draw solution corresponding to the second pass, from the second side of the semi permeable membrane as a system level diluate draw solution when a batch consists of maximum of two passes, wherein the pass level draw solution having a higher osmotic pressure than an osmotic pressure of the pass level feed solution.
68. The separation system as claimed in claim 66, wherein the separation system further configured to mix a system level process solution with a pass level process solution thereby achieving a semi-batch separation,
wherein the system level process solution includes a system level feed solution, a system level draw solution, a system level retentate solution and a system level diluate draw solution,
wherein the pass level process solution includes a pass level feed solution, a pass level draw solution, a pass level retentate solution and a pass level diluate draw solution.
69. The separation system as claimed in claim 66, wherein the separation system
further configured for parallel filling the at least one feed side reservoir with a system

level feed solution and the at least one draw side reservoir with a system level draw solution for the one or more subsequent separation cycles to achieve at least one of the batch separation and the semi batch separation.
70. The separation system as claimed in claim 66, wherein the separation system
further configured to enable a reservoir switchover sequence to switch connections to
supply one of the system level feed solution and the pass level retentate solution stored in
one of the at least one feed side reservoir and one of the system level draw solution and
the pass level diluate draw solution stored in one of the at least one draw side reservoir as
the pass level feed solution and the pass level draw solution respectively having a higher
osmotic pressure than an osmotic pressure of pass level feed solution to any of its
subsequent pass by:
enabling different hydraulic segments of the separation system to replace the pass level feed solution, the pass level draw solution, the pass level retentate solution and the pass level diluate draw solution corresponding to an earlier pass with a pass level feed solution, a pass level draw solution, a pass level retentate solution and a pass level diluate draw solution of a next pass.
71. The separation system as claimed in claim 66, wherein the flow of feed solution
on the first side of the semipermeable membrane and the flow of draw solution on the
second side of the semipermeable membrane are one of counter current, co-current and
cross-current to each other.
72. The separation system as claimed in claim 66, wherein at least one of the generated
system level retentate solution from one batch separation or semi batch separation is
used as system level feed solution to another batch separation or semi batch separation
and the generated system level diluate draw solution from one batch separation or semi
batch separation is used as system level draw solution to another batch separation or
semi batch separation.