FORM 2
THE PATENT ACT 1970
(39 OF 1970)
&
The Patents Rules, 2003
COMPLETE SPECIFICATION
(See section 10 and rule 13)
1. TTTLE OF THE INVENTION: Wet organic solid waste digester
2. APPLICANT:

(a) NAME : Mantras Green Resources Ltd.
(b) NATIONALITY : An INDIAN Company
(c) ADDRESS : Hall No. 1, First Floor, NICE Sankul,
Plot no. A-9, Near ITI Singal, MIDC Satpur, Nashik-422 007, Maharashtra, India
3. PREAMBLE TO THE DESCRIPTION
COMPLETE
The following specification particularly describes the invention and the manner in which it is to be performed

TITLE OF THE INVENTION:
Wet organic solid waste digester
FIELD OF THE INVENTION:
The present invention relates to a bio-digester which converts wet organic waste, obtained from various sources into combustible bio-gas and bio-fertilizer by the process of anaerobic digestion.
BACKGROUND OF THE INVENTION:
Anaerobic digestion is a collection of processes by which microorganisms break down biodegradable matter in the absence of oxygen. This process, also known as bio-digestion, is used for industrial or domestic purposes to manage waste. Bio-digestion mainly involves the bacterial digestion of input materials. Many microorganisms are involved in this anaerobic digestion process including acetic acid forming bacteria, acetogens and methane forming microorganisms, methanogens. These microorganisms initiate a number of chemical processes which convert the biomass to biogas.
Anaerobic digestion is used to treat biodegradable waste and sewage sludge. Widely used as a source of renewable energy, it forms a part of integrated waste management systems and reduces the emission of landfill gases into the atmosphere by producing biogas which can be used for various purposes. The three main products of anaerobic digestion are biogas, digestate and water. This biogas consists of methane, carbon di oxide and traces of other contaminant gases. It can be used directly as fuel in combined heat and power gas engines or can be upgraded

to natural gas-quality bio-methane. The digestate, which is also an end product of anaerobic digestion, is rich in nutrients and can be used as fertilizer.
Different kinds of anaerobic digesters are designed and engineered to operate using a number of different configurations which can be categorized into batch vs. continuous process mode, mesophillic vs. thermophillic temperature conditions, high vs, low portion of solids and single stage vs. multistage processes.
US Patent 5451319 discusses an anaerobic digestion process for sewage sludge which comprises the steps of dewatering raw sewage sludge to provide a solids content therein in the range of 10 to 25 weight %, recirculating a portion of digested sludge resulting from methane fermentation and having a dry solids content lower than that of said dewatered raw sewage sludge, adding one part by weight of the dewatered raw sewage sludge to at least one part by weight of the recirculated digested sludge, homogeneously kneading the resulting mixture for inoculation, and causing methane fermentation of the inoculated sludge mixture in a tube-shaped digestor. The inoculated sludge is moved in the longitudinal direction of the tube in the digestor during methane fermentation, and a portion of the sludge discharged from the digestor is recirculated.
US Patent 5942116 describes an anaerobic sludge digester which has a top, a bottom, sloped sides leading to the bottom, and a draft tube with an upper end spaced downward of the top of the digester and a lower end spaced upward of the bottom of the digester. The draft tube may have a propeller, impeller, or jets that enable liquid to be transported through the draft tube from one part of the digester to another. The digester has a discharge mouth positioned within the digester to receive heavy material that is pumped from the bottom of the digester and which flows outward across the liquid surface. One or more spray nozzles are located above the liquid

surface to break up foam and emulsions. The mouth may also be used to effectively remove scum and light solids from the liquid surface. A shutoff valve on a discharge pipe extending from the discharge mouth can be closed while sludge is added to the system, causing the liquid level to rise above the mouth. After the spray nozzles are used to create a swirl in the surface liquid, the shutoff valve can be opened to draw in significant quantities of scum and light solids. US Patent 7172698 discloses an egg-shaped anaerobic sludge digester which has upper and lower draft tubes, and an optional middle draft tube. The draft tubes are arranged so that liquid can be (1) simultaneously pumped downwards through the upper (or middle) draft tube and upwards through the lower (or middle) draft tube; (2) simultaneously pumped upwards through two or more draft tubes; or (3) simultaneously pumped downwards through two or more draft tubes. When a middle draft tube is provided, it can be used in place of the upper draft tube when the liquid surface in the digester falls below the top of the upper draft tube. Alternatively, the middle draft tube can work as a coordinated relay conduit to move liquid either in the same direction as the upper draft tube or to move liquid in the same direction as the lower draft tube. US Patent 8110106 provides an anaerobic digester design and operation wherein the apparatus includes a pre-digestion treatment chamber and an anaerobic digester chamber coupled to the pre-digestion treatment chamber. A liquid suspension of solid waste is pretreated under aerobic conditions by heating to a desired pre-digestion temperature. One or more chemical or biological additives are added to the suspension of solid waste to improve the anaerobic digestibility of the solid waste. This may include enzymes to destruct poorly digestible solids and/or materials to provide a desired C:N ratio in the solid waste. The apparatus may include mixers, heaters, chemical or biological additives as needed, various sensors and probes, and a control system to

monitor and control the anaerobic digestion process and maintain microbial health of the digester.
US Patent 8298424 gives an apartment-shaped anaerobic digester for producing biogas configured to include input reactors into which livestock wastewater or food waste (hereinafter, "inflow') is introduced; regions of an anaerobic digestion reactor designed for the inflow passing through an input reactor to perform methane fermentation to produce and transfer biogas simultaneously into the next region; an inlet pipe into which sludge liquid is drawn; an inlet pipe into which activated liquid is drawn; a biogas capturing device; a first heat exchange tube to allow the sludge liquid to perform heat exchange with a new inflow; regions of a subsequent treatment reactor to allow the sludge liquid whose heat exchange is completed to be introduced and to treat gas odor components generated from the sludge liquid; and a liquid-composting reactor in which the emitted sludge whose odor components have been removed is stored. US Patent 9133430 relates to an apparatus for production of a biogas by anaerobic digestion of organic material, the apparatus comprising: a digester chamber defining: a gas generating zone and a gas collecting zone. A biogas outlet is defined in the gas collecting zone, and one or more nozzles is/are arranged to spray a gas cooling liquid into the gas accommodated in the gas collecting zone so as to cool the gas. A collecting member is arranged in the gas collecting zone lo collect the gas cooling liquid when sprayed from the one or more nozzles towards the collecting member so as to prevent the gas cooling liquid from entering the organic material. The collecting member is arranged to cause the collected gas cooling liquid to flow into a liquid based safety valve.
US Patent Application 20150101375 describes a compact anaerobic digestion system to converts household waste biomass materials to methane rich biogas and concentrated compost

slurry of about 9 to 40% solids for agriculture soil applications. The horizontal anaerobic digester vessel comprising a horizontal vessel provided with insulation and preferably cylindrical at the bottom, fitted inside of the said vessel is at least one shaft with 4-100 radial or horizontal or diagonal baffles at equal distribution, and attached with a handle or wheel outside the vessel to rotate the shaft from outside, the said vessel being provided with minimum of one port at one end for introducing the raw biomass wastes and another set of ports for discharging stabilized wastes at the opposite end, and having one valve-controlled gas port of above the level of the said port for discharging stabilized wastes, a small hand operated shredder coupled to the digester vessel for shredding/cutting/crushing large and hard solids such as bones to get particles preferably lesser than 10 mm sizes. The waste falls inside the digester and gets mixed slowly while being fed by rotating the handle attached to a shaft having baffles inside the digester. WO 2012116394 discusses an anaerobic digester for digesting organic matter and producing biogas. The digester (12) includes a support (14), and a drum (16) rotatably mounted on the support about a longitudinal axis thereof. The drum has an internal drum surface (19) and defines a closed interior space (20). The drum (16) has two fixed mixing blades (32, 34) on the internal surface (19) which project into the interior space (20), and which mix organic matter within the interior space (20) when the drum (16) rotates. The digester (16) also includes a feed/discharge arrangement (40) on an end (23) of the drum (16) through which organic matter can be fed into and discharged from the drum (16). The digester (12) also includes a biogas off-take arrangement including a gas collection head (89) and an off-take conduit (90) for drawing off biogas generated within the drum (16). An apparatus including an outer container within which the digester (12) is contained is also disclosed. The outer container can be heated by means of a heat exchanger to increase the temperature within the digester to promote digestion. The outer

container can be a rectangular intermodal shipping container which enables the apparatus to be transported from one location to another.
WO 2015082891 discloses a containerized waste digester which is a system for anaerobic digestion of organic waste comprising a plurality of containers sealingly connected end-on-end and/or stacked on top of each other to form a tunnel to receive the waste, the tunnel configured to be sealingly closed for given period for digestion of the waste contained therein. EP 1586632 provides an anaerobic digester, designed to produce biogas and compost, has a preparation tank mounted on weight sensors and equipped with an ultrasound system, comprising a transmitter (59) and receiver (60), for measuring the concentration of solid matter. -It also has a system for reducing the solid matter, especially straw and other plant waste, into particles no more than 4 mm long before they go into the preparation tank. The digestion takes place in one or more chambers heated by a diffusion system and insulated by layers of heat reflective and low conductivity materials set at a distance from the chamber walls to create an air gap. The chambers are mounted on a platform made from honeycomb panels and installed inside a holder of heated water that allows the digestion temperature to be controlled. The water can be heated by a co-generator (19) that also produces electricity.
GB 2448113 gives an anaerobic digester 12 for organic microbial waste treatment apparatus 10, comprises a reaction chamber 22, an inlet for the supply of organic waste into the reaction chamber 22, an effluent outlet 26 for supplying effluent from the anaerobic digester 12 to an aerobicdigester 14, a waste gas outlet 28 for waste gas produced in the reaction chamber 22 to flow out of the reaction chamber 22, two or more bio-gas discharge mixing devices 32 provided in the reaction chamber 22, and pumping apparatus 29a for supplying mixed bio-gas to the biogas discharge mixing devices 32. The or each biogas discharge mixing devices 32 having a

plurality of discharge outlets 34 for the discharge of mixed bio-gas into the organic waste in the reaction chamber 22. At least one of the mixing devices having first said discharge outlets 34 which are oriented to direct mixed bio-gas into the organic waste for mixing the waste, and at least the other mixing device having second said discharge outlets 34 which are oriented to direct mixed bio-gas at one or more interior surfaces 22b of the reaction chamber 22 for scouring the or each said interior surface. Also claimed is an organic microbial waste treatment apparatus comprising an anaerobic digester as previously described, an aerobic digester and means for pumping effluent between the two.
RU 2491233 relates to a domestic digester for recovery of biological nitrogen- and carbon-bearing wastes by anaerobic fermentation for production of high-quality fertiliser. Domestic digester comprises heat-isolated body 1 divided by partitions 4 into intercommunicated fermentation chambers 5, loading pipe 2 and discharge pipe 3 and biogas discharge hydraulic gate 9. Perforated partitions are arranged inside said body one above the other while loading pipe is furnished with feed valve 12. Body insulation is composed of two spaced apart layers. Every layer consists of inner heat-reflective layer and outer heat-isolation layer while resistive heater is arranged between said layers and distributed over inner layer surface. Temperature gage is provided to control air temperature in air gap. Digester inner surface has antirust polymer coating. Stiff jacket covers the digester from outside. Feed valve represents a flexible immersed leaf shutter located at top partition.
JP 02-211299 describes anaerobic digestion of sludge with high digestion rate in a short period of time by supplying solubilized organic sludge into an anaerobic digestor chamber wherein exist the methane bacteria which propagate at a pH value of 7.8-8.5 and thereafter effecting its anaerobic digestion in at least five days. The organic sludge is subjected to a wet milling

treatment, supersonic treatment and heat treatment to break the cell walls of the sludge microorganisms for effecting solubilization thereof. The sludge thus solubilized is supplied into an anaerobic digestor chamber containing as main microbial mass the methane bacteria which propagate rapidly in sewage sludge at a pH value of 7.8-8.5. This sludge is then subjected to anaerobic digestion within the aforesaid pH range and for at least five days with the bacteria-inoculated sludge kept in the chamber. The adoption of this treatment method permits a high digestion rate to be attained in only several days, thereby increasing substantially the treating capacity of the digestor chamber.
CN 102618437 discusses a convenient and fast biogas digester anaerobic fermentation device relates to livestock wastewater treatment. The convenient and fast biogas digester anaerobic fermentation device comprises a biogas digester and an auxiliary biogas digester, wherein the biogas digester is provided with a water inlet guide pipe, a biogas digester water flowing hole and a digester bottom slag discharging hole, thebiogas digester water flowing hole is connected with the auxiliary biogas digester, the wastewater discharged from the biogas digester water flowing hole enters into the auxiliary biogas digester andis discharged from a water outlet of the auxiliary biogas digester, and the biogas is discharged from a biogas collecting pipe; a biogas digester arch surface is arranged on the upper portion of the biogas digester, an inspection hole and a biogas collecting hole is mounted on the biogas digester arch surface, and a water flowing hole and a water outlet are disposed on the biogas digester above the biogas digester arch surface; a fixed pipeline, a moveable pipeline, a tee joint and a straight joint are installed between the biogas digester and the auxiliary biogas digester;; and the auxiliary biogas digester is connected with the biogas digester through the water flowing hole, the water in the auxiliary biogas digester is

discharged from the water outlet of the auxiliary biogas digester, the water discharged from the water outlet of the auxiliary biogas digester passes through the water flowing hole to be discharged from the biogas digester water outlet, and the digester bottom slag discharging hole of the biogas digester and a digester bottom slag discharging hole of the auxiliary biogas digester are connected with a slag discharging pipeline valve.
CN 203946997 discloses a rural household refuse and sewage treatment system which comprises a sewage collecting pond and a household refuse storage bin, wherein the sewage collecting pond is provided with a grating well, and the sewage collecting pond is sequentially connected with an adjusting tank, an anaerobic tank, an oxygen-deficient tank, an oxidation pond, a settling pond, a shallow subsurface infiltration system and a sterilization tank; the household refuse storage bin is connected with a biogas digester, the biogas output end, the biogas residue output end and the biogas slurry output end of the biogas digester are respectively connected with a biogas storage tank, a sludge drying chamber and the adjusting tank, the biogas storage tank is connected with a biogas power generation system, and the exhaust gas output end of the sludge drying chamber is connected with the shallow subsurface infiltration system; and the anaerobic tank, the oxygen-deficient tank and the oxidation pond are respectively provided with a sludge return port, and the sludge return ports are connected with the biogas digester through a sludge tank. According to the rural household refuse and sewage treatment system disclosed by the utility model, a sewage treatment station purifies water by virtue of AAO technological treatment and by using the shallow subsurface infiltration system, and is connected with a household refuse treatment system, so that rural household refuses and sewage as well as sludge in the sewage treatment station, and the like can be comprehensively treated; and the rural

household refuse and sewage treatment system is convenient and efficient, low in investment cost, less in occupied land, and high in benefits.
Indian Patent Application No. 32/MUM/2011 provides an anaerobic digester assembly comprising an inclinedly disposed digester chamber having an inlet means to introduce DOC in slurry form prepared with water to said digester chamber, vertically; a gas outlet at the other end thereof and a discharge outlet located at the base of said digester chamber connecting to digestate collection system for discharging spent feed, said digestate collection system provided with automatic level control means.
Although a number of digesters for anaerobic digestion are available in the prior art, a wet organic solid waste digester, which is modular, made of pre-fabricated structures, having integrated or separate sludge pits as per the requirement and possessing required safety features with improved reaction rate for faster solid waste digestion, is the need of the day.
OBJECT OF THE INVENTION:
The main object of the invention is to provide for wet organic solid waste digester which digests wet organic solid waste from residential or commercial places and produces combustible biogas along with nitrogen-phosphorus-potassium enriched bio-fertilizer by the process of anaerobic digestion.
Another object of the invention is to provide for wet organic solid waste digester which has a broad range of waste feed capacity and is made of pre-fabricated structures which can be easily transported and assembled on site.

Still another object of the invention is to provide for wet organic solid waste digester which has the option of providing integrated sludge pit or separate sludge pit as per the requirement.
Yet another object of the invention is to provide for wet organic solid waste digester which has the provision of safety valve which can be opened in case of accidental pressure build up or accidental fire, to prevent explosions.
A further object of the invention is to provide for wet organic solid waste digester which has octagonal dome shaped gas holder tank that enables pressure build-up of the collected gas so that the gas reaches the user's end at sufficient pressure.
SUMMARY OF THE INVENTION:
The present invention provides wet organic solid waste digester which digests wet organic solid waste from domestic or commercial establishments and produces combustible biogas which can be used as a bio-fuel, along with nitrogen-phosphorus-potassium enriched digestate which can be used as a bio-fertilizer, by the process of anaerobic digestion. For achieving this, waste is fed into the fermenter tank along with water which is broken down by microorganisms in the absence of oxygen to produce biogas and bio-fertilizer which are used for various purposes.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 gives the three dimensional view of the solid waste digester.
Fig. 2 gives the flow-chart of the process of digestion of the wet organic solid waste
Fig. 3 gives the table displaying the cost-benefit analysis for different sizes of digesters

DETAILED DESCRIPTION:
The nature of the invention and the manner in which it is performed is clearly described in the specification. The invention has various components and they are clearly described in the detailed description.
Organic waste or green waste comprises organic material such as food, garden, lawn clippings etc. It can also include animal and plant based material as well as degradable carbon such as paper, cardboard, timber etc. When such organic waste is dumped as domestic or industrial waste, it gets sent to landfill sites without being properly utilized. At these sites, it undergoes anaerobic decomposition due to lack of oxygen and generates methane gas which when released in the atmosphere causes more harm as methane is 20 times more potent greenhouse gas than carbon dioxide. But methane is also a valuable energy source as the natural gas used for domestic and industrial purposes. Moreover, organic wastes can also be treated to make mineral rich fertilizers. So, organic waste recycling is a naturally efficient, earth-friendly disposal alternative, which benefits the community and the environment.
The present invention is wet organic solid waste digester which converts wet organic wastes obtained from various sources such as kitchens, toilets, animal husbandry, farms, temples, gardens etc. into combustible biogas by the process of anaerobic digestion: This bio-digester has waste feed capacity ranging from 4 kg/day to 40 kg/day which corresponds to bio-digester sizes of 7"X7" to 9"X9". As shown in Fig. 1, the main parts of the solid waste digester are waste feed inlet, fermenter tank, gas holder tank, gas outlet and sludge pit. Individual components of this bio-digester like fermenter tank, sludge pit walls, foundation, gas holder tank, feed and drain plumbing etc. are pre-fabricated according to the requirement and then are assembled on site thereby making transportation and assembling of the digester easy. The integrated sludge pit has

mechanical separator for ease of drying. If there is no scope for installing integrated sludge pit along with the digester, the invention has an option of separate sludge pits or direct drain of the sludge in the available drainage system as per on site requirement. The digester of the present invention also has a safety valve in the gas pipeline as well as 3 ball valves in drain plumbing which can be opened in case of accidental pressure build up or accidental fire breakdown due to any external reasons.
As shown in Fig. 1, the fermenter tank, the gas holder and sludge pits of the bio-digester are octagonal shaped that enables pressure build-up of the collected gas so that it reaches the burner at the user's end at a sufficient pressure. The walls of the fermenter tank are decorated with surface ornamentation of octagonal & square tessellations while the gas holder tank is decorated with diamond/half diamond funnel at the apex. This gas holder tank provides waste feed input to the fermenter tank in a manner such that passive agitation of the fermenting material is achieved. This improves the reaction rate of the digestion process as well as it helps in breaking the scum. A pressure gauge is placed at the top of the bio digester to measure the pressure created in it.
The process of digestion of organic waste using the present invention is shown in Fig. 2. Wet organic waste obtained from kitchens, toilets, animal husbandry farms, temples, gardens etc, is finely pulped or ground. These starchy, sugary, cellulosic or fatty substances without any extradious matter like plastic etc., are used as feed stock. This finely pulped organic waste is fed into the rfermenter tank along with adequate amount of water. In this fermenter tank, microorganisms break down the biodegradable material in the absence of oxygen.

This bio-digestion occurs in four stages namely hydrolysis, acidogenesis, acetogenesis and methanogenesis. During hydrolysis, the bacteria transform the particulate organic substrate into liquefied monomers and polymers i.e. proteins, carbohydrates and fats are transformed to amino acids, monosaccharides and fatty acids respectively. In the second stage of acidogenesis, the acidogenic bacteria transform the products of the first stage into short chain volatile acids, ketones, alcohols, hydrogen and carbon dioxide. From these, the hydrogen, carbon dioxide and acetic acid skip the third stage of acetogenesis and are used directly by the methanogenic bacteria in the final stage. In the third stage of acetogenesis, the propionic acid, butyric acid and alcohols which are end-products of the second stage, are transformed by acetogenic bacteria into hydrogen, carbon dioxide and acetic acid. The fourth and final stage of anaerobic breakdown of biodegradable matter is called methanogenesis, during which microorganisms convert hydrogen and acetic acid formed in the previous stages, into methane gas and carbon dioxide.
Due to gas production, the gas holder tank starts to rise as the gas collected in the dome pushes it upwards. This pressurized gas can be used for various applications like cooking, heating etc. The residue remaining after the bio-digestion process is collected into sludge pits where it is dried. This dried residue can be used as bio-fertilizer which is rich in nitrogen-phosphorus-potassium. If there is no provision of sludge pits, the residue is drained off into sewage chambers.
The amount of biogas generated in this anaerobic digestion process depends upon various factors like feed stock configuration, ambient temperature, pH level of the feed stock etc. Optimally, the wet organic solid waste digester of the present invention takes around 45 days of reaction period after which it starts to yield combustible bio-gas and bio-fertilizer.

Fig. 3 gives the table displaying the cost-benefit analysis for different sizes of digesters of the present invention. It gives the gas yield per day depending on the waste feed per day fed into the optimally sized digester. It also gives the LPG equivalent of the gas yield, the cost of the gas produced, the fertilizer cost savings by using the digestate as fertilizer, the revenue generated by the plant's yield per day as well as calculated revenue per year and the maximum time for use of the plant everyday.
The wet organic solid waste digester of the present invention is highly advantageous. It is available in different sizes as per the user's requirement depending on the waste feed generated. As most of the components of the bio-digester like the fermenter tank, sludge pit walls, foundation, gas holder tank, feed and drain plumbing etc. are pre-fabricated and assembled on site, transportation and assembling of the digester becomes easy. Digestion of wet organic solid waste leads to the production of biogas which can be used for various purposes like heating, cooling etc. After the fermentation process, the sludge from the digester, which is the digestate, is collected into sludge pits which have mechanical separators for drying the sludge easily. This dried sludge is rich in nitrogen, phosphorus and potassium content and so can be used as bio-fertilizer. The present invention has the option of providing integrated or separate sludge pit as per the requirement. If there is no scope for providing a sludge pit, the invention provides the facility for directly draining the sludge in the available drainage system. The gas generated from the bio-digester contains considerable amount of carbon dioxide which is not combustible and which displaces air as it is heavier than air. So there are no chances of occurrence of explosion due to gas leakage. However, there is a provision for safety valve in the gas pipeline and 3 ball valves in the drain plumbing which can be opened in case of accidental pressure build-up or accidental fire breakdown due to any external reasons, thereby making the invention very safe.

The bio-digester of the present invention has distinctive octagonal dome shaped gas holder tank that enables build-up of pressure of the collected gas so that it reaches to the burner at the user's end at a sufficient pressure. The gas holder tank also provides waste feed input to the fermenter tank in a manner such that passive agitation of the fermenting material is achieved. This passive agitation improves the rate of reaction of the fermentation process. This mechanism which is a part of feed as well as gas holder tank also helps in breaking the scum. Moreover the bio-digester is equipped with a pressure gauge at the top which helps to measure the pressure created in the bio-digester. Apart from producing biogas and bio-fertilizer, the present invention also has positive environmental impact of reduced pollution, improved communal hygiene and more importantly reduced landfill dumping.
Although the preferred embodiment as well as the method and use have been specifically described, it should be understood that variations in the preferred embodiment could be achieved by a person skilled in the art without departing from the spirit of the invention. The invention has been described with reference to specific embodiment which is merely illustrative and not intended to limit the scope of the invention as defined in the claims.

We claim,
1. Wet organic solid waste digester comprises pre-fabricated components namely fermenter tank, sludge pit walls, foundation, gas holder tank, feed and drain plumbing and others which can be assembled on site and which has a waste feed capacity ranging from 4 kg per day to 40 kg per day which is achieved by means of shape and method of construction of the pre-fabricated elements of the digester.
2. The wet organic solid waste digester as claimed in claim 1 wherein the digester has the option of providing integrated sludge pit or separate sludge pit as per the requirement wherein the integrated sludge pit is provided with mechanical separator which provides ease of drying.
3. The wet organic solid waste digester as claimed in claim 2 wherein if there is no scope for providing any kind of sludge pit, there is an option of draining off the sludge in the drainage system.
4. The wet organic solid waste digester as claimed in claim 1 wherein the digester is provided with a safety valve in the gas pipeline and 3 ball valves in the drain plumbing which can be opened in case of accidental pressure build-up or accidental fire breakdown due to any external reasons.
5. The wet organic solid waste digester as claimed in claim 1 wherein the digester has octagonal shaped fermenter tank, gas holder tank and sludge pits and the walls of the fermenter tank have surface ornamentation of octagonal and square tessellations and the gas holder tank has a diamond or half-diamond funnel at the apex.

6. The wet organic solid waste digester as claimed in claim 5 wherein the octagonal dome shaped gas holder tank enables pressure build up of the collected gas so that it reaches the burner at the user's end at sufficient pressure.
7. The wet organic solid waste digester as claimed in claim 6 wherein the gas holder tank provides waste feed input to the fermenter tank in a manner in which passive agitation of the fermenting material is achieved which improves the rate of reaction of the fermentation process as well as helps in breaking the scum.
8. The wet organic solid waste digester as claimed in claim 1 wherein the digester is provided with a pressure gauge placed at its top to measure the pressure created in the digester.
9. The wet organic solid waste digester substantially herein described with reference to the foregoing description and diagrams.