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Title:
AN AUTOMATED ANAEROBIC DIGESTER
Document Type and Number:
WIPO Patent Application WO/2021/001716
Kind Code:
A1
Abstract:
An automated: anaerobic digester using human excreta at thermophilic temperature through heavy PVC pipe assembly for producing bio-gas by bacterial decomposition of wet sludge human excreta. The natural decay process anaerobic decomposition is to speed up by using tuba tank (10) made from stainless steel and heavy thick wall PVC pipe/vessel (3) with motor (15) control stirrer (9) and spiral edited stainless steel heat exchanger (8) using convection. A. family type indoor anaerobic digester, the bacteria works best at thermophilic temperature, varying from 45° -70° C. The thermophilic responsible for digestion, the optimum thermophilic temperature is around 55° C, controlled by temperature controller. Heat Recovery hot water from heating, cooling and ventilation of heating equipment is used to maintain thermophilic temperature. Alternately energy used as are solar hot water or conventional gas, electrical energy as standby. The rats of gas production approximately doubles up for every 10°C and double between 35°C to 55°C.

Inventors:
MEHTA ALPESH (IN)
Application Number:
IB2020/055832
Publication Date:
January 07, 2021
Filing Date:
June 20, 2020
Export Citation:
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Assignee:
MEHTA ALPESH (IN)
International Classes:
C12M1/107; C12M1/02; C12M1/34; C12M1/36
Foreign References:
CN107418881A2017-12-01
CN202322828U2012-07-11
CN202881262U2013-04-17
US20170291858A12017-10-12
CN106635786A2017-05-10
CN201921026078U2019-07-03
IN1480MUM2012A
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Claims:
IM:

1. An automated anaerobic digester using human excreta at thermophilic temperature through PVC pipe assembly comprising,

a stainless steel tube tank (10) and

a thick wall PVC vessel/pipe (3), characterized in that

a dome shape (2) on top of thick wall PVC vessel/pipe (3) with an end cap (1); a gas outlet is provided on top of PVC vessel/pipe (3) with a pressure release valve (17);

a bio-gas generator tank inlet is connected to the gas outlet to obtain released biogas;

a copper spiral coiled heat exchanger (8) coupled with thick wall PVC tube (7) being provided over stainless steel tube tank (10);

a stainless steel stirrer (9) is connected from the bottom of the stainless steel tube tank (10), being configured for clockwise and anti-clockwise rotational movement;

said stainless steel stirrers (9) controlled by a controller is configured to maintain the viscous level of the wet sludge within heavy PVC pipe assembly;

a controller disposed within the stainless steel tube tank (10) to control the clockwise and anti-clockwise movement of the stainless steel stirrer (9) to maintain uniform temperature within sledge (19);

an inlet (13) from vacuum pump with crusher is provided to the stainless steel tube tank (10) inlet;

an inlet is provided to the auxiliary tank with a stainless steel hopper (24) from the stainless steel tube tank (10) outlet;

a PVC tube (7) covers over the stainless steel tube with copper spiral coil heat exchanger (8) and an insulator is connected at an upper portion;

a motor (23) is mounted over the top of the stainless steel hopper (24); a screw mechanism (27) with two disc and bolt (4 and 7) being provided to move upward and downward simultaneously; an inlet (22) is provided to the stainless steel hopper (24) from the outlet of the anaerobic digester;

a sensor mounted within the stainless steel tube tank (10) with touch screen over tank interfaced with z wave central controller;

a sensor mounted outside the stainless steel tube tank (10) with controller to detect and alert the leakage of biogas that automatically close the provided emergency valve;

an alert to receive over a smart phone and a central unit for intimating filling up of biogas within the plastic bag and biogas bottle;

a copper vessel (4) is welded with hollow aluminum tubes to work as heat exchanger;

the heat exchanger being configured to maintain temperature of 55°C within the copper vessel (4); and

said aluminum tube having inlet and outlet being welded for hot water flow/circulation within the tubes.

2. The automated anaerobic digester as claimed in claim 1, wherein a stainless steel and/or copper spiral coiled heat exchanger (8) is used within the stainless steel tube tank (10).

3. The automated anaerobic digester as claimed in claim 1, wherein the heat exchanger (8) having an inlet and an outlet is connected within the stainless steel tube tank (10).

4. The automated anaerobic digester as claimed in claim 1, wherein the sensor mounted within and over the stainless steel tube tank (10) is configured to detect temperature, distance, humidity soil, CO2, CH4, and/or N.

5. The automated anaerobic digester as claimed in claim 1, wherein the temperature is controlled by central controller using wireless z-wave and/or Wi-Fi switching. 6. The automated anaerobic digester as claimed in claim 1, wherein the anaerobic digester working on thermophilic temperate generates biogas higher yield at 55° C.

7. The automated anaerobic digester as claimed in claim 1, wherein the sensor to detect temperature, C0 , CH , and/or N is mounted within and over stainless steel tube tank (10) with touch screen interfaced with z wave central controller.

8. The automated anaerobic digester as claimed in claim 1, wherein the natural decay process anaerobic decomposition is to speed up by through the stainless steel tube tank (10) and heavy thick wall PVC vessel/pipe (3).

9. The automated anaerobic digester as claimed in claim 1, wherein the generated biogas is collected within plastic bag and/or biogas bottle.

10. The automated anaerobic digester as claimed in claim 1, wherein the heat is transferred through heat exchanger by using heat recovery water mix with nano solution in the ratio of 50:50 in closed loop.

AMENDED CLAIMS

received by the International Bureau on 08 December 2020 (08.12.2020)

1. An automated anaerobic digester using human excreta at thermophilic temperature through PVC pipe assembly comprising, a stainless steel tube tank (10) and a thick wall PVC vessel/ pipe (3), characterized in that a dome shape (2) on top of thick wall PVC vessel/ pipe (3) with an end cap (1); a gas outlet is provided on top of PVC vessel/ pipe (3) with a pressure release valve (17); a bio-gas generator tank inlet is connected to the gas outlet to obtain released biogas; a copper spiral coiled heat exchanger (8) coupled with thick wall PVC tube (7) being provided over stainless steel tube tank (10); a stainless steel stirrer (9) is connected from the bottom of the stainless steel tube tank (10), being configured for clockwise and anti-clockwise rotational movement; said stainless steel stirrers (9) controlled by a controller is configured to maintain the viscous level of the wet sludge within heavy PVC pipe assembly; a controller disposed within the stainless steel tube tank (10) to control the clockwise and anti-clockwise movement of the stainless steel stirrer (9) to maintain uniform temperature within sledge (19); an inlet (13) from vacuum pump with crusher is provided to the stainless steel tube tank (10) inlet; an inlet is provided to the auxiliary tank with a stainless steel hopper (24) from the stainless steel tube tank (10) outlet; a PVC tube (7) covers over the stainless steel tube with copper spiral coil heat exchanger (8) and an insulator is connected at an upper portion; a motor (23) is mounted over the top of the stainless steel hopper (24); a screw mechanism (27) with two disc and bolt (4 and 7) being provided to move upward and downward simultaneously; an inlet (22) is provided to the stainless steel hopper (24) from the outlet of the anaerobic digester; a sensor mounted within the stainless steel tube tank (10) with touch screen over tank interfaced with z wave central controller; a sensor mounted outside the stainless steel tube tank (10) with controller to detect and alert the leakage of biogas that automatically close the provided emergency valve; an alert to receive over a smart phone and a central unit for intimating filling up of biogas within the plastic bag and biogas bottle; a copper vessel (4) is welded with hollow aluminum tubes to work as heat exchanger; the heat exchanger being configured to maintain temperature of 55°C within the copper vessel (4); and said aluminum tube having inlet and outlet being welded for hot water flow/ circulation within the tubes; wherein a stainless steel and/or copper spiral coiled heat exchanger (8) is used within the stainless steel tube tank ( 10); said heat exchanger (8) is having an inlet and an outlet and is connected within the stainless steel tube tank ( 10); wherein the sensor mounted within and over the stainless steel tube tank (10) is configured to detect temperature, distance, humidity soil, CO2, CH4, and/or N; wherein the temperature is controlled by central controller using wireless z-wave and/or Wi-Fi switching; wherein the anaerobic digester working on thermophilic temperate generates biogas higher yield at 55° C; wherein the sensor to detect temperature, CO2, CFU, and/or N is mounted within and over stainless steel tube tank ( 10) with touch screen interfaced with z wave central controller; wherein the natural decay process anaerobic decomposition is to speed up by through the stainless steel tube tank ( 10) and heavy thick wall PVC vessel/ pipe (3); wherein the generated biogas is collected within plastic bag and/or biogas bottle; wherein the heat is transferred through heat exchanger by using heat recovery water mix with nano solution in the ratio of 50:50 in closed loop.

Description:
AN AUTOMATED ANAEROBIC DIGESTER

TECHNICAL FIELD OF INVENTION:

The present invention generally relates to the production of bio-gas from human waste. More particularly the present invention relates to an automated anaerobic digester using human excreta at thermophilic temperature, where the biogas is produced by bacterial decomposition of wet sludge human excreta. The natural decay process anaerobic decomposition can be speed up using a tube made from stainless steel and heavy thick wall PVC pipe with motor control stirrer and spiral coiled stainless steel heat exchange using convection.

BACKGROUND OF THE INVENTION:

The anaerobic digester is to feed with human excreta in proportion with black water to maintain the viscose level of sledge for better performance. A stainless steel stirrer moves clockwise and counter clock wise for uniform temperature within sledge.

As a result of the fossil fuel crisis and increase C0 2 emission in atmosphere, switching to energy efficient product and alternate of source of energy have recently attracted greater interest.

Different types of biogas digesters are available in markets. Few of them are KVIC, Prad, Astra, and Afpro. It is known that production of bio-gas through anaerobic digestion of the biomass is dependent on temperature.

Numerous processes have been developed over the years for biological treatment of domestic wastewater and sludge. This biological treatment processes include anaerobic treatment processes which use biologically active microorganism to convert arias soluble contaminants, especially organic contaminants, which can be separated from wastewater.

With reference to the Indian Patent application 1480/MU M/2012 aims at maintaining higher yield of bio-gas at thermophilic temperature. Whereas the design appears bulky complex structure, with body and heat exchange made from base metal, which increase the cost of system. Besides, it uses square vessel, where within vessel the layer temperature formation which result into lower gas production then the rated gas generation. The Anaerobic digesters are to be kept at outdoors, where the feed is human excreta and kitchen waste. The invention is modification to said patent application.

The technical problems in the prior art application is that the thermophilic responsible for digestion, the optimum thermophilic temperature is around 55° C. The weather conditions influence the gas generation to great extend viz. wind velocity (chill factor) and sunshine directly available to keep the dome at the optimum temperature. Variation in the ambient temperature result into low production of bio-gas.

The feed to anaerobic digester mainly are from animal wastes and agricultural wastes and occupies more space.

The prior art Indian patent application, the anaerobic digester have bulky structure and are more costly as base metal are used for heat exchange.

The present application provides solution to the above mentioned problems by the implication of the following system. The Anaerobic digester working on thermophilic temperate generates bio-gas higher yield at 55° C. A heat exchange is used as copper spiral coil heat exchanger within PVC tubes. The temperature is controlled by central controller using wireless z-wave/Wi-Fi switching. A family type indoor anaerobic digester with human excreta inputs, are to feed directly from anaerobic digester ready commode.

OBJECT OF THE INVENTION:

The principal objective of the present invention is that the higher yield of bio-gas using heavy PVC pipe structure with copper tube as heat exchange, for optimum performance.

The other objective of the present invention is to provide a closed looped PVC tubes sized for required pressure with human excreta feed.

The other objective of the present invention is the use of two stainless stirrers, controlled by electric motor to maintain the viscose level of the wet sludge within the heavy PVC pipe assembly which maintains 55° C degree centigrade. Use of z wave/Wi-Fi temperature sensor interface with z wave/Wi-Fi touch screen controller. The Bio-gas z wave/Wi-Fi leakage sensor installed near release valve, z-wave stop valve, z wave solenoid valve, alerts, sms, voice message call.

Another objective of the present invention is that the generated bio-gas is collected within plastic bag or bio-gas bottle, used to generate electricity using bio-gas generator or bio-gas for kitchen use.

Yet another objective of the present invention is the interface with common second manure hopper stainless steel tank with z wave/Wi-Fimoisture sensor, distance sensor with alerts, sms, and voice call z wave/Wi-Fi bio-gas meter interface with z wave/Wi-Fi touch screen and monitoring agency.

SUMMARY OF THE INVENTION: An automated anaerobic digester using human excreta at thermophilic temperature through pvc pipe assembly, comprises a stainless steel tube tank; a thick wall PVC vessel/pipe; a dome shape on top of thick wall PVC vessel/pipe with an end cap; a gas outlet is provided on top of PVC vessel/pipe with a pressure release valve; a bio gas generator tank inlet is connected to the gas outlet to obtain released biogas; a copper spiral coiled heat exchanger coupled with thick wall PVC tube being provided over stainless steel tube tank; a stainless steel stirrer is connected from the bottom of the stainless steel tube tank, being configured for clockwise and anti-clockwise rotational movement; a controller disposed within the stainless steel tube tank to control the clockwise and anti-clockwise movement of the stainless steel stirrer to maintain uniform temperature within sledge; an inlet from vacuum pump with crusher is provided to the stainless steel tube tank inlet; an inlet is provided to the auxiliary tank with a stainless steel hopper from the stainless steel tube tank outlet; a PVC tube covers over the stainless steel tube with copper spiral coil heat exchanger and an insulator is connected at an upper portion; a motor is mounted over the top of the stainless steel hopper; a screw mechanism with two disc and bolt being provided to move upward and downward simultaneously; an inlet is provided to the stainless steel hopper from the outlet of the anaerobic digester; a sensor mounted within the stainless steel tube tank with touch screen over tank interfaced with z wave central controller; a sensor mounted outside the stainless steel tube tank with controller to detect and alert the leakage of biogas that automatically close the provided emergency valve; an alert to receive over a smart phone and a central unit for intimating filling up of biogas within the plastic bag and biogas bottle; a copper vessel is welded with hollow aluminum tubes to work as heat exchanger. Further, said stainless steel stirrers controlled by a controller is configured to maintain the viscous level of the wet sludge within heavy PVC pipe assembly; and the heat exchanger being configured to maintain temperature of 55°C within the copper vessel; and said aluminum tube having inlet and outlet being welded for hot water flow/circulation within the tubes.

BRIEF DESCRIPTION OF THE DRAWINGS:

Example embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements and in which:

Figure 1 illustrates a structural view of an automated anaerobic digester using human excreta at thermophilic temperature through PVC pipe assembly, according to one or more embodiment.

Figure 2 illustrates the outdoor common unit where a stainless steel hopper with inlet from common outlet of digested sludge to anaerobic digesters, according to one or more embodiment.

Other features of the present embodiments will be apparent from the accompanying drawings and from the detailed description that follows.

DETAILED DESCRIPTION OF THE INVENTION:

A system, method, and device for an automated anaerobic digester using human excreta at thermophilic temperature through PVC pipe assembly are disclosed.

The following detailed description includes references to the accompanying drawings, which form a part of the detailed description. The drawings show illustrations in accordance with example embodiments. These example embodiments are described in enough detail to enable those skilled in the art to practice the present subject matter. However, it will be apparent to one of ordinary skill in the art that the present invention may be practiced without these specific details. In other instances, well-known methods, procedures and components have not been described in detail so as not to unnecessarily obscure aspects of the embodiments. The embodiments can be combined, other embodiments can be utilized or structural and logical changes can be made without departing from the scope of what is claimed. The following detailed description is, therefore, not to be taken as a limiting sense, and the scope is defined by the appended claims and their equivalents.

Now referring to Fig.l, an automated anaerobic digester using human excreta at thermophilic temperature through pvc pipe assembly according to the present invention comprises a stainless steel tube tank (10); a thick wall PVC vessel/pipe (3); a dome shape (2) on top of thick wall PVC vessel/pipe (3) with an end cap (1); a gas outlet provided on top of the PVC vessel/pipe (3) with a pressure release valve (17); a bio-gas generator tank inlet is connected to the gas outlet to obtain released biogas; a copper spiral coiled heat exchanger (8) coupled with thick wall PVC tube (7) being provided over stainless steel tube tank (10); a stainless steel stirrer (9) connected from the bottom of the stainless steel tube tank (10), configured for clockwise and anti-clockwise rotational movement; a controller disposed within the stainless steel tube tank (10) to control the clockwise and anti clockwise movement of the stainless steel stirrer (9) for maintaining uniform temperature within sledge (19); an inlet (13) from vacuum pump with crusher being provided to the stainless steel tube tank (10) inlet; a PVC tube (7) covers over the stainless steel tube with copper spiral coil heat exchanger (8) and an insulator is connected at an upper portion. Said stainless steel stirrers (9), as depicted in Fig.l, are controlled by a controller which maintains the viscous level of the wet sludge within heavy PVC pipe assembly. Figure 1 illustrates a structural view of an automated anaerobic digester using human excreta at thermophilic temperature through PVC pipe assembly, according to one or more embodiment.

Particularly, Figure 1 illustrates different components of automated anaerobic digester with tube made from stainless steel and heavy thick wall PVC pipe,

1. PVC End Cap

2. Dome shape reducer to remove gas

3. PVC thick wall gas vessel

4. PVC tube cover, as insulator

5. Reducer coupler between PVC tube and Stainless Steel tube

6. Outlet of water mix solution.

7. PVC tube over heat exchanger

8. Copper tube heat exchanger

9. Stirrer

10. Stainless steel Tube Tank

11. PVC reducer

12. Stirrer rod

13. Inlet from Vacuum pump with curser to Digester Vessel

14. Stainless steel Tube

15. Motor

16. Outlet of vacuum pump with crusher

17. Pressure release valve with emergency valve

18. Outlet form vessel to auxiliary hopper.

19. Inlet form anaerobic digester ready commode - sledge

20. Touch Screen with sensor interface over tank

21. Indoor tank sensor C02, CH4, N Now as shown in Fig.2, the automated anaerobic digester according to the present invention comprises an inlet provided to the auxiliary tank with a stainless steel hopper (24) from the stainless steel tube tank (10) outlet; a motor (23) mounted over the top of the stainless steel hopper (24); a screw mechanism (27) with two disc and bolt (25 and 28) being provided to move upward and downward simultaneously; an inlet (22) provided to the stainless steel hopper (24) from the outlet of the anaerobic digester; a sensor mounted within the stainless steel tube tank (10) with touch screen over tank interfaced with z wave central controller; a sensor mounted outside the stainless steel tube tank (10) with controller to detect and alert the leakage of biogas that automatically close the provided emergency valve; an alert to receive over a smart phone and a central unit for intimating filling up of biogas within the plastic bag and biogas bottle; a copper vessel (4) welded with hollow aluminum tubes to work as heat exchanger. Further, said heat exchanger is configured to maintain temperature of 55°C within the copper vessel (4), and said aluminum tubes having inlet and outlet being welded for hot water flow/circulation within the tubes.

Figure 2 illustrates the outdoor common unit where a stainless steel hopper with inlet from common outlet of digested sludge to anaerobic digesters, according to one or more embodiment.

Particularly, Figure 2 illustrates different components of outdoor common unit,

22. Inlet form anaerobic digester outlet

23. Motor

24. Stainless steel hopper

25. Disc with bolt movement over screw lower

26. End plate fixed to hopper over which screw moves

27. Screw Mechanism

28. Disc with bolt movement over screw top. 29. Distance sensor interface with z wave/Wi-Fi touch screen.

30. Humidity moisture sensor interface with z wave/Wi-Fi touch screen

In another embodiment, the wet sledge (19) from commode is crushed by curser and further suctioned by vacuum pump into the anaerobic digester made from heavy duty PVC pipes to withstand required pressure, with stainless steel coupler interface with PVC pipe, the spiral heat exchange made from copper is inserted within PVC pipe, maintains the stainless steel stirrer (9) maintain viscous sludge level and uniform temperature within PVC pipe.

The surrey is removed out from outlet (18) of bottom centre form required PVC tube diameter, which is the digested contain of human excreta, which further moved to PVC outlet, by opening butterfly valve, within a plastic bag, removing the moisture and converting into natural organic manner, which on bag get filled will be intimated by sms, alert to owner using IOT.

The top of the tank is dome shape, or from top centre PVC tube coupled with stainless steel, where the bio-gas collected, reach the required pressure, have pressure valve, release the biogas into PE bags or directly as sized to biogas electric generator, which is attached to tie grid invertor, into the grid or the biogas can be used for cooking application.

As a standby, alternately, an indecent coil is fixed as a standby heater using renewable energy, conventional energy or gas fuel.

In another embodiment, the wet sledge (19) from commode is crushed by curser and further suctioned by vacuum pump into the anaerobic digester within stainless steel inlet pipe with required viscous sludge level. The stainless steel stirrer (9) maintain viscous sludge level and uniform temperature within the stainless tube with heat exchanger (8) by conduction and convection using copper spiral coil with inlet and outlet , cover with PVC tube as insulator (7). The surrey is remove out from outlet (18) of stainless steel tube , which is the digested contain of human excreta, which further moved to auxiliary hopper (24) tank made from stainless steel through inlet.

In yet another embodiment, the copper vessel (4) is welded with hollow aluminum tubes that work as heat exchange. The function of heat exchange is to maintain temperature to 55°C within the copper vessel. The aluminum tube is welded having inlet outlet where the hot water is passed within the tubes at inlet. The hot water is circulated within tubes and removed from outlets from hot water tank. Temperature controller on solenoid valve (20 and 21) and heat pump as the temperature vessel sensor sense temperature below 55°C. During the flow of hot water, the heat from water is transferred within the vessel. Once the temperature reaches 55°C, it closes (20, 21 and 19). This process is continued 24 hours, 365 days. Insulation of body mainly includes by plastic and rock wool.

In yet another embodiment, the outdoor common unit where a stainless steel hopper (24) with inlet (22) from common outlet of digested sludge to anaerobic digesters. The motor(23) is mounted with screw mechanism(27) with two disk with bolt (25 and 28), both move upwards and downwards simultaneously, the top disk(28) will force the dry manure downwards when the dryness is sensed by humidity soil sensor(30) and second will open the hopper(24) to fill for mature collection within a recyclable bag. Once the distance sensor (29) sense for distance, the motor stop, clock wise and move in upward direction in counter clock wise and close the hopper. The process is follow till all the manure is filled within the bags. The alerts are on IOT smart phone or touch screen.

The top of the tank is dome shape, where the bio-gas collected, reach the required pressure, have pressure valve, release the bio-gas into PE bags or directly as sized to biogas electric generator , which is attached to tie grid invertor, into the grid or the biogas can be used for cooking application. A sensor to detect temperature, C0 2 , CH 4 , and N is mounted within tubular tank with touch screen over tank interfaced with touch screen over with z wave central controller.

A sensor to detect C0 2 , CH 4 outside is mounted over tubular tank, with controller with alerts and leakage detect, close emergency valve.

Additionally, while the constructional and operational process described above and illustrated in the drawings is shown as a sequence of steps, this was done solely for the sake of illustration. Accordingly, it is contemplated that some constructional and operational steps may be added, some constructional steps may be omitted, the order of the constructional steps may be re-arranged, and/or some constructional steps may be performed simultaneously.

Although embodiments have been described with reference to specific example embodiments, it will be evident that various modifications and changes may be made to these embodiments without departing from the broader spirit and scope of the system and method described herein. Accordingly, the specification and drawings are to be regarded in an illustrative rather than a restrictive sense.

Many alterations and modifications of the present invention will no doubt become apparent to a person of ordinary skill in the art after having read the foregoing description. It is to be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitation. It is to be understood that the description above contains many specifications; these should not be construed as limiting the scope of the invention but as merely providing illustrations of some of the personally preferred embodiments of this invention. Thus the scope of the invention should be determined by the appended claims and their legal equivalents rather than by the examples given. LIST OF REFERENCE NUMERALS

1. PVC End Cap

2. Dome shape reducer to remove gas

3. PVC thick wall gas vessel/pipe

4. PVC tube cover as insulator OR copper vessel

5. Reducer coupler between PVC tube and Stainless Steel tube

6. Outlet of water mix solution.

7. PVC tube over heat exchanger

8. Copper tube heat exchanger

9. Stirrer

lO.Stainless steel Tube Tank

11. PVC reducer

12.Stirrer rod

13. Inlet from Vacuum pump with curser to Digester Vessel 14.Stainless steel Tube

15. Motor

16.0utlet of vacuum pump with crusher

17. pressure release valve with emergency valve

18.0utlet from vessel to auxiliary hopper.

19. Inlet form Anaerobic digester ready commode - sledge 20.Touch Screen with sensor interface over tank

21. Indoor tank sensor C02, CH4, N.

22. Inlet form Anaerobic digester outlet

23. Motor

24.Stainless steel hopper

25. Disc with bolt movement over screw lower

26. End plate fixed to to hopper over which screw moves