The invention relates to a interconnected passage between inlet cha»ber and outlet chamber for anaerobic digestion or substances such as pressssud from sugar Skills, agricultural and/or industrial wastes to produce organic manure and/or biogas.
KVIC and modified KVIC designs for anaerobic digestion of cow-dung is commonly available in India. There are various other designs of liquid digestors which are also in the market. So far the known level of digestor size for slurries has been mostly on an experimental stage and no large sized commercial scale anaerobic digestors for slurries have been attempted anywhere in India.
In the conventional designs there are many operating problems relating to poor mixing, scum formation, cessation of microbial activities, solid withdrawals and low biogas generation. In order to overcome these problems, bio-reactor having inclined passage connecting the inlet chamber and outlet chamber is used.
The invention provides a bio-reactor comprising an inlet chamber having slurry inlet, vent, drain, the said inlet chamber being connected to auri outlet chamber through sn inclined passage, the said outlet chamber having a gas outlets and slurry outlet.
The bio-reactor according to the invention is schematically fthown in the accompanying drawing. The various reference numerals indicate the various parts of the bio-reactor as follows :

1. Slurry inlet. 5. Outlet.
2. Vent. 6. Inlet chanber.
3. Gas outlet. 7. Inclined Tube..
4. Drain. 8. Outlet Chamber.
9. Alkaly do-iing no22l©.
The digestors are interoonnected to a feeding system fro» th© Bixers and also interconneoted to the outlat system connecting to the dewatering system when dischar^ged fro» the reactors. The biogas generated ftoB each digestor »ay be interconnected and collected and taken into the dryer system.
The novfcti features of this design provides the folloTJing advantages :
1. The digestors are housed on ground level and minimum energy is required for pumping the slurry in or out of the digestors.
2. Unlike the existing circular tank type reactor the vertical segregation of layer is minimised by the inclined tubular construction.
3. Scum formation is also minimised as only the outlet chamber has a gas liquid interface.

4. Natural mixing characteristics are good because the gas generated has to pass through the inclined passage. Similarly there is a constant aovenent of Kolids to th© bottom of the inclined pas-sage which displaces and encourages aiixing.
Other benefits achieved are :
1. The ffiicroblal activity in shortest pariod sjaximisss
anaerobic digestion and high quality organic manure is produced.
2. Simultaneous generation of biogas from non-conventional
energy source is made possible.
3. A reduction in the chemicsl oxygen demand (COD) levels
upto 20% which reduces the load on the downstream of the aerobic
treatment of the distillery effluent.
The construction and operation of this design is simnple and can be managed with the minimum manpower and space. The design is modular and the capacity can be progressively enhanced according to the need. For a sugar factory witii a distil ley bio-reactor according to the invention will be an ideal solution for efficient disposal of their waste v?ith simultaneous resource recovery and biogas generation

The invention relates to a bio-reactor for anaerobic ditfestion of substances such as pressnud from sugar mills, agricultural and/or industrial wastes to produce organic manure and/or biogas with water and/or preparing a slurry with water and effluents such as spent wash sewage water and other industrial liquid wastes.
Reactors for anaerobic digestion of cow-dung are known. However, the known level of digester size for slurries has been mostly small size of operation and no large sized commercial scale anaerobic digestion for slurries have been attempted. In the conventional designs there are many operating problems relating to poor mixing, scum formation, cessation of microbial activities solid withdrawals and low biogas generation. In order to overcome these problems, the invention provides a bio-reactor having inclined passage connecting the inlet chamber and outlet chanber.
Accordingly the invention provides a bio-reactor comprising at least one inlet chamber having a slurry inlet and a vent at the top portion and a drain and outlet at the bottom portion; at least .one outlet chamber having a gas outlet and an alkali dozing nozzle at the top portion and a drain and an outlet at the bottom portion; the bottom portion of the said inlet chamber being connected to the top portion of the outlet chamber through an inclined passage.

The bio-reactor according to the invention is schematically shown in the accompanying drawing.
There are at least one inlet chamber (6) and at least one outlet chamber (8). The inlet chamber is provided with a slurry inlet (1) and vent (2) at the top portion. At the bottom portion of the inlet chamber a drain (4) and an outlet (5) are provided. The lower portion of the inlet chamber (6) is connected to the upper portion of the outlet chamber (8) through an inclined passage <7). The outlet chamber (8) is also provided with a drain (4) and outlet (5) at the bottom portion. At the top portion of the outlet chamber, a gas outlet (3) and an alakli dozing nozzle (9) are provided. With plurality of inlet chambers and outlet chambers, the slurry inlets may be interconnected to a feeding system from the mixers. Similarly the outlets of the plurality of outlet chambers may be interconnected to a dewatering system. The bio-gas from the gas outlets may be interconnected and collected or taken to dryer.
The bio-reactor according to the invention provides the following advantages:-
1. The digesters are housed on ground level and minimum energy is required for pumping the slurry in or out of the digesters.
2. Unlike the existing circular tank type reactor the vertical segregation of layer is minimised by the inclined tubular construction.

3. Soum formation is also nininised as only the outlet
chanber has a gas liquid interface.
4. Hatural mixing characteristics are good because the gas
generated has to pass through the inclined passage. Similarly
there is a constant movement of solids to the bottom of the
inclined passage which displaces and encourages mixing.
Other benefits achieved are :
1. The microbial activity in shortest period maximises
anaerobic digestion and high quality organic manure is produced.
2. Simultaneous generation of biogas from non-conventional energy source is made possible.
3. A reduction in the chemical oxygen demand (COD) levels upto 20X which reduces the load on the downstream of the anaerobic treatment of the distillery effluent.
The construction and operation of this design is simple and can be managed with the minimum manpower and space. The design is modular and the capacity can be progressively enhanced aooording to the need. For a sugar factory with a distillery bio-reactor according to the invention will be ideal solution for efficient disposal of their waste with simultaneous resource recovery and biogas generation.

WE CLAIM :
1. A bio-reactor comprising at least one inlet chamber (6) having a
slurry inlet (1) and a vent (2) at the top portion and a drain (4)
and outlet (5) at the bottom portion; at least one outlet chamber
(8) having a gas outlet (3) and an alkali dozing nozzle (9) at the
top portion and a drain (4) and an outlet (5) at the bottom
portion; the bottom portion of the ,said inlet chamber (6) being
connected to the top portion of the outlet chamber (8) through
an inclined passage (7).
2. The bio-reactor as claimed in claim 1, comprising plurality of
inlet chambers (6) and equal number of outlet chambers (8)
with the inlets of the inlet chambers being interconnected to
receive the feed in each inlet chamber and the outlets of outlet
chambers being interconnected to collect the biogas.
3. A bio-reactor, substantially as hereinabove described and
illustrated with reference to the accompanying drav\Hngs.