Claims:We Claim:
1. A portable agitator based biogas digester system (100) comprising:
a foldable digester housing (102) configured for accumulation of organic material slurry for generation of biogas, wherein the foldable digester housing (102) comprises:
a feed material inlet (104) for feeding the organic material slurry into the biogas digester housing (102),
a biogas collection outlet (106) for collecting biogas generated inside the foldable digester housing (102),
a slurry fertilizer outlet (110) for discharging fertilizer slurry out of the foldable digester housing (102),
a waste material cleaning drain valve (112) configured for removing the organic waste and cleaning the portable biogas digester system; and
an agitator mechanism (108) positioned outside the foldable digester housing (102) and configured for agitating the organic material slurry, wherein the agitator mechanism (108) is installed on a foldable exoskeleton stand (114), wherein the foldable exoskeleton stand (114) is configured to support the foldable digester housing (102).

2. The portable agitator based biogas digester system (100) as claimed in claim 1, wherein the foldable digester housing (102) is inflatable for accumulation of biogas liberated from the organic material slurry.

3. The portable agitator based biogas digester system (100) as claimed in claim 1, wherein body, of the foldable digester housing (102), is made from a multilayered material, wherein an outermost layer, of the multilayered material, is made from neoprene rubber and a second layer, of the multilayered material, is a nitrile coating layer.

4. The portable agitator based biogas digester system (100) as claimed in claim 1, wherein the agitator mechanism (108) is mounted to the foldable digester housing (102) using a foldable tripod stand (114) from outside of the foldable digester housing (102).

5. The portable agitator based biogas digester system (100) as claimed in claim 1, wherein the agitator mechanism (108) comprises a manual rotating handle (116), a bevel gear mechanism (118), an agitator (120), and a sealing mechanism (122).

6. The portable agitator based biogas digester system (100) as claimed in claim 4, wherein the agitator (120) comprises a two blade shaft arrangement (124) positioned inside the digester housing, wherein the two blade shaft arrangement (124) is hanging above the bottom surface of the foldable digester housing (102) at a height equivalent to one fourth height of the foldable digester housing (102).

7. The portable agitator based biogas digester system (100) as claimed in claim 1, wherein the manual rotating handle (116) is connected to the agitator (120) from outside of the foldable digester housing (102) using the bevel gear mechanism (118) at a 90° angle, enabling the manual rotating of the agitator from outside of the foldable digester housing (102).

8. The portable agitator based biogas digester system (100) as claimed in claim 1, wherein the agitator (120) and the manual rotating handle (116) are connected through a sealing mechanism (122), wherein the agitator shaft (124) is passed through a sealing mechanism (122) flange which is fixed on the top side of the foldable digester housing (102) to avoid leakage.

9. The portable agitator based biogas digester system (100) as claimed in claim 1, wherein the waste material cleaning drain valve (112) is positioned at the bottom of the digester housing to clean a digester system without entering into the digester.

10. The portable agitator based biogas digester system (100) as claimed in claim 1, is a balloon type biogas digester system.

Dated this 24th Day of June 2020
, Description:FORM 2
THE PATENTS ACT, 1970
(39 of 1970)
&
THE PATENT RULES, 2003
COMPLETE SPECIFICATION
(Specification 10 and Rule 13)

Title of invention:
A PORTABLE AGITATOR BASED BIOGAS DIGESTER SYSTEM

APPLICANT:
Nutzen Engineering Solutions
An Indian entity having address as,
S. No- 39/4, "Peony" B 1001
Pune, Maharashtra - 411045 India

The following specification particularly describes the invention and the manner in which it is to be performed.

CROSS-REFERENCE TO RELATED APPLICATION(S) AND PRIORITY
The present application does not claim priority from any other patent application(s).
FIELD OF INVENTION
The present invention relates to the field of portable biofuel generation systems. More particularly, the present invention relates to the portable biogas digester system.

BACKGROUND OF INVENTION
As on today the organic material wastes are sent to landfill sites and it is kept as it is to degenerate on its own. Such open organic landfill sites often tend to release greenhouse gases such as methane in atmosphere, if these gases are not trapped it causes damage to ozone layer harming the environment.
In state of the art, biofuel digester systems are utilized to help trap these gases in balloon and can be used as a fuel for cooking, energy, etc. Also, the source of the biogas is easily available in household, restaurants, and also to the rural area residing people as a cattle waste. The rural area residing people can afford these digesters and also manage their organic waste at household, Co-Op society, canteen level for producing biogas which can be used as clean cooking fuels in biogas stoves.
In state of the art, various biogas digesters and storage units are available. These two units are masonry type large scale digesters which also requires the civil construction of huge tanks, plastic tank digesters or PVC plastic bag digesters.
However, the existing units lack in enabling portability to the biogas digesters. Also, the biogas digesters disclosed in state of the art are not enabled to deal with the problem of choking of the of small scale digester choking, sludge formation. Also the housing unit of the digesters is either made of plastic which is vary tedious to clean and prone to short life and chocking of the digester or made of large scale cement digester not enabled for portability and need entering inside the tank for cleaning and removing the clogging.
Therefore, there is a long felt need of an economic, portable, small scale biogas digester unit which can easy to be cleaned and does not comprise problems such as chocking of the tank due to hardening of the biowaste.
Hence, the present inventors were motivated to pursue their research to develop the said digester system in a portable, durable, substantially cost effective and eco-friendly manner of for biogas generation and to obviate the problems associated with the various prior art process(s).

OBJECTIVES OF THE INVENTION
The main objective of the present invention is to provide a portable agitator based biogas digester system, which is simple, economical, user friendly, and commercially viable.
Another objective of the present invention is to provide a chocking free small scale digester with a flexible and durable digester housing.
Yet another objective of the present invention is to improve provide a modified agitation mechanism inside a flexible digester housing of a biogas digester system and an easy cleaning mechanism without entering the digester system.
SUMMARY OF THE INVENTION
Before the present, systems, and processes are described in the said proposed invention, it is to be understood that the disclosed invention is not limited to the specific systems and processes as described herein, as there can be multiple possible embodiments which hare not expressly illustrated in the present invention but may still be practicable within the scope of invention. It is also to be understood that the terminology used in the description is for the purpose of describing the particular versions or embodiments only and is not intended to limit the scope of the present application.
The instant invention describes a potable biogas system of generation and storage of the biogas obtained by the bio-organic waste material.
Accordingly, the present invention provides a portable agitator based biogas digester system. The said system may comprise one or more components enabling portability and avoid chocking of the digester system enabling durability of the biogas digester system.
The said portable agitator based biogas digester system may comprise a foldable digester housing configured for accumulation of organic material slurry for generation of biogas. The said foldable digester housing may further comprise a feed material inlet configured for feeding organic material slurry into to the biogas digester housing. The said foldable digester housing may further comprise a biogas collection outlet for collecting biogas generated inside the foldable digester housing. The said foldable digester housing may further comprise a slurry fertilizer outlet for discharging fertilizer slurry out of the foldable digester housing. The said foldable digester housing may comprise a waste material cleaning drain valve configured for removing the organic waste and cleaning the portable agitator based biogas digester system. The said foldable digester housing may comprise an agitator mechanism positioned outside the foldable digester housing and configured for agitating the organic material slurry, wherein the agitator mechanism is installed on a foldable exoskeleton stand, wherein the foldable exoskeleton stand is configured to support the foldable digester housing.
BRIEF DESCRIPTION OF DRAWINGS
The detailed description is described with reference to the accompanying Figures. In the Figures, the left-most digit(s) of a reference number identifies the Figure in which the reference number first appears. The same numbers are used throughout the drawings to refer like features and components.
Figure 1 depicts an overall assembly of the portable agitator based biogas digester system (100), in accordance with an embodiment of the present invention.
Figure 2 depicts the top view of a portable agitator based biogas digester system (100), in accordance with an embodiment of the present invention.
Figure 3 depicts the front view of a portable agitator based biogas digester system (100), in accordance with an embodiment of the present invention.

DETAILED DESCRIPTION OF THE INVENTION
The words “comprising”, “having”, “containing”, “including” and other forms thereof, are intended to be equivalent in meaning and be open ended in that an item or items following any one of these words is not meant to be an exhaustive listing of such item or items or meant to be limited to only the listed item or items.
It must also be noted that, the singular forms “a”, “an”, and “the” include plural references unless the context clearly dictated otherwise, although any methods similar or equivalent to those described herein can be used in the practice or testing of embodiments of the present invention, the exemplary systems are described. The disclosed embodiments are merely exemplary of the invention, which may be embodied in various forms.
Various modifications to the embodiment may be readily apparent to those skilled in the art and the generic principles herein may be applied to other embodiments. However, one of ordinary skill in the art may readily recognize that the present invention is not intended to be limited to the embodiments illustrated but is to be accorded the widest scope consistent with the principles and features described herein.
No terminology in this application should be construed as indicating any non-claimed element as essential or critical. The use of any and all examples, or example language (e.g., "such as") provided herein, is intended merely to better illuminate example embodiments and does not pose a limitation on the scope of the claims appended hereto unless otherwise claimed.
The present invention now will be described in total hereinafter. Indeed, the invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather these embodiments are provided so that his invention will satisfy applicable legal requirements.
The disclosed invention of digester system is made of for scientifically managing home based waste, restaurant, and canteen organic waste as well as it can be used at cow shades where it will operate on cow manure.
Referring to Figure 1, a portable agitator based biogas digester system (100) for generation of biogas from bio-organic material waste is illustrated in accordance with an embodiment of the present invention, the portable agitator based biogas digester system (100) may comprise one or more components in interconnection and interdependence with each other.
The portable agitator based biogas digester system (100) may comprise various modified components enabling portability and avoid chocking of the digester system and further enabling durability of the biogas digester system. The portable agitator based biogas digester system (100) may comprise a foldable digester housing (102), configured for generation of biogas. The foldable digester housing (102) is particularly configured for accumulation of organic material slurry for generation of biogas. The foldable digester housing (102) (also referred as “digester housing”) is a digestion tank comprising the waste material slurry and various inlets outlets attached to the housing. The foldable digester housing (102) is inflatable for accumulation of biogas liberated from the organic material slurry. The body of the foldable digester housing (102) is made from a multilayered material. The outermost layer, of the multilayered material, is made from neoprene rubber and a second layer, of the multilayered material, is a nitrile coating layer. The two layer fabric housing enables easy installing and requires very light civil work and therefore ready to use as soon on installed in 1 to 2 hours of time. The neoprene rubber is a heavy duty rubber material which is durable and light weight foldable fabric. The neoprene rubber outer layer of the digester housing (102) may also comprise a coating of the rodent repellent and UV protection selected as but not limited to nitrile layer. The two layer fabric tank digester housing minimizes any chances of leakage. Also, the balloon type structure of the digester tank enables holding of excess biogas generated inside the housing (102).
In one embodiment, the foldable digester housing (102) may also be used in dual features i.e. for generation of biogas and for storage of the biogas generated in the digester system and also inflatable for accumulation of biogas liberated from the organic material slurry The foldable digester housing (102) may be enabled for 8 to 10 hours of gas storage without any additional storage system. The digester housing (102) comprises features such as low weight, rust proofing, and weather proofing properties enabling portability and durability to the biogas digester system (100).
Referring to Figure 1 and Figure 3, an overall view and front view of the biogas digester system (100) is described. In one embodiment, foldable digester housing (102) may comprise a feed material inlet (104) configured for feeding organic material slurry into to the biogas digester housing (102) from the bottom of the digester system (100). In one embodiment, the feed material inlet (104) may be positioned at any portion of the foldable digester housing (102). In one embodiment, a biogas collection outlet (106) is disclosed. Referring to figure 2 and 3, the biogas collection outlet (106) is positioned at the upper portion of the biogas digester housing (102) for collection and further distribution of biogas generated inside the foldable digester housing (102).
Again, referring to figure 1, 2 and 3, in one embodiment, the biogas digester system (100) comprises an agitator mechanism assembly positioned at the upper portion of the foldable digester housing (102) outside the foldable digester housing (102) and configured for agitating the organic material slurry is illustrated. The agitator mechanism (108) is positioned within the foldable digester housing (102) and configured for agitating the organic material slurry. The agitator mechanism (108) is installed on a foldable exoskeleton stand (114), wherein the foldable exoskeleton stand (114) is configured to support the foldable digester housing (102). In one embodiment, the agitator mechanism (108) is mounted to the foldable digester housing (102) using a foldable tripod stand (114) from outside of the foldable digester housing (102).
In state of the art, the flexible balloon tanks are not enabled with agitator mechanism as they tend to leak out. Such biogas balloon digestion tanks are often installed without agitator mechanism and therefore engage with the choking and clogging of the tank further reducing the usability duration of the tank. Therefore, to overcome this shortcoming of the existing systems following modifications are carried out to the discloses portable agitator based biogas digester system (100).The agitator mechanism (108) may comprise a manual rotating handle (116) , a bevel gear mechanism (118), the agitator (120) , and a sealing mechanism (122). In one embodiment, the agitator (120) comprises a two blade shaft arrangement (124) positioned inside the digester housing, wherein the two blade shaft arrangement (124) is hanging above the bottom surface of the foldable digester housing (102) at a height equivalent to one fourth height of the foldable digester housing (102).
In yet another embodiment, manual rotating handle (116) is connected to the agitator (120) from outside of the foldable digester housing (102) using the bevel gear mechanism (118) at an angle of 90° enabling the manual rotating of the agitator from outside of the foldable digester housing (102). In yet another embodiment, the agitator (120) and the manual rotating handle (116) are connected through a sealing mechanism (122), wherein the agitator shaft (124) is passed through a sealing mechanism (122) flange which is fixed on the top side of the foldable digester housing (102) to avoid leakage. In one embodiment, the agitation mechanism inside the portable agitator based digester housing (102) may operate on zero electricity and requires a minor manual operation. The manual rotating handle (116) attached to the agitator shaft (124) from the outside of the digester housing enables high efficiency generation of biogas and also improve yield per kg than that of the existing mechanisms.
The main advantage of connecting an agitator mechanism (108) along with a sealing mechanism (122) and a manual rotating handle is that to avoid leakage and also to enable a user to operate the agitation system from outside of the tank (foldable digester housing).
In one embodiment, the exoskeleton stand (114) is the foldable stand (114) which can hold the two blade shaft agitator arrangement (124), vertically in the digester chamber and for manual rotation (116) form outside of the foldable digester housing (102), the bevel gear (118) are fitted at top with handle attached at 90 degree. In one embodiment, the agitator shaft (124) passes through a flange which is fixed on top side of digester unit as a seal. In one embodiment, the flange sealing mechanism (122) may be enabled to hold a seal bearing to agitator mechanism (108). This bearing provides shaft rotation as well as there is no leakage of gas through it because of its sealant properties.
In one embodiment, the portable agitator based biogas digester system (100) may also comprise a slurry fertilizer outlet (110) configured for separating and for discharging fertilizer slurry out of the foldable digester housing (102).
In one embodiment, the portable agitator based biogas digester system (100) may also comprise a waste material cleaning drain valve (112) configured for removing the organic waste and cleaning the portable agitator based biogas digester system. In one embodiment, the waste material cleaning drain valve (112) is positioned at the bottom of the digester housing to clean a digester system without entering into the digester. The cleaning drain valve (112) is enabled for removal of excess utilized sludge from the digester system. The cleaning drain valve is also configured for removing the whole organic material from the digester housing (102) which enables portability and foldability to the overall biogas digester system (100).
In one embodiment, the disclosed biogas digestion system (100) is ergonomically easy to operate, assemble, disassemble, reinstall and movable/portable from one site to another site.
In one embodiment, the disclosed biogas digestion system (100) may be enabled to directly connect to the biogas cooking stove for on-line consumption by adding a gas line (not shown) to the biogas collection outlet (106) enabling high utilization of the biogas generated in the biogas digestion system (100).
The present invention is further described by following examples as proof of concept:
Example 1
This micro scale portable agitator based biogas digester (100) is in the capacity of 4 cubic meter in volume and it is designed for intake of 50 kg of organic waste material / cow manure per day. The digester (100) is enabled to generate biogas in the range of 2 to 3 cubic meter / day based on either cattle manure or kitchen waste, the gas rich in methane which can be used for: 1. Cooking, 2. Power generator and 3. Hot water generator. Also, the slurry produced as by-product is extraordinarily rich organic fertilizer and can used for gardening, farming as fertilizer. In one embodiment, this micro scale portable agitator based biogas digester may be varying in sizes such as 4, 5 and 6 cubic meter.

In Table 1 as below, performance details of the portable biogas digestion system (100) for 4 cubic meter volume is disclosed:
Table 1
Particulars Value Particulars Values
Overall Volume 4. cubic meter Cooking time 3-4 Hours of cooking per day
Dimension 2.3*0.9 Meter Daily Waste consumption 50 kg of waste
Gas Holding 1.4 Cubic meter Gas generation ratio 1 Kg waste = 0.04 cubic meter of biogas for Cattle manure and 0.06 cubic meter of biogas for kitchen waste

Example 2
Optionally, the biogas digester system (100) may also comprise a biogas holding balloon unit (not shown) and a Scrubber unit for purifying the biogas (not shown). In one embodiment, household, kitchen, canteen, and restaurant organic waste, a primary sorting table, shredder and mixer units are attached to the biogas digester system (100). The additional equipment may consume 1 to 2 units of electricity /day for 50 kg / day organic waste.
The said portable agitator based biogas digester system (100) as described in the present invention comprise the following advantages:
• The disclosed biogas digester system is an economical, cheaper and portable equipment can be shifted after removal of substrate such as bio-organic waste.
• The disclosed biogas digester system comprises a manually operable agitator mechanism (108) which improves gas generation efficiency, minimizes settling of substrate at the bottom, eases to avoid choking of digester, and also easy to clean
• The disclosed biogas digester system comprises a specialized fabric as a biogas digester housing tank and made from a heavy duty rubber material with neoprene coating and rodent repellant nitrile coating.
• The disclosed biogas digester system is easy to install and as may requires 1 to 2 hours for installation, and does not necessitate heavy digging, earth moving or big civil foundation.

The embodiments, examples and alternatives of the preceding paragraphs or the description and drawings, including any of their various aspects or respective individual features, may be taken independently or in any combination thereof. Features described in connection with one embodiment are applicable to all embodiments unless such features are incompatible.