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I have been searching for some method of using the food waste, decomposable organic material and kitchen waste efficiently, and came across information on producing bio-gas from organic waste.

The bio-gas produced from food waste, decomposable organic material and kitchen waste, consisting of methane and a little amount of carbon di oxide is an alternative fuel for cooking gas (LPG). Also, the waste materials can be disposed off efficiently without any odor or flies and the digested slurry from the bio-gas unit can be used as an organic manure in the garden.

Components of the Bio-gas Plant

The major components of the bio-gas plant are a digester tank, an inlet for feeding the kitchen waste, gas holder tank, an outlet for the digested slurry and the gas delivery system for taking out and utilizing the produced gas.

This project is also useful for students to have a hands-on learning experience in constructing a Mini Bio-Gas Plant, using locally available material.

Material Required:

1. Empty PVC can 50 ltrs capacity: 1 No. (to be used as Digester Tank)
2. Empty PVC can 40 ltrs capacity: 1 no. (to be used as Gas Holder Tank) (Make sure the smaller can fits inside larger one and moves freely)
3. 64 mm dia pvc pipe: about 40 cm long (to be used for feeding waste material)
4. 32 mm dia pvc pipe: about 50 cm long (fixed inside gas holder tank as a guide pipe)
5. 25 mm dia pvc pipe: about 75 cm long (fixed inside the digester tank as a guide pipe)
6. 32 mm dia pvc pipe: about 25 cm long (fixed on digester tank to act as outlet for digested slurry)
7. M-seal or any water-proof adeshive
8. Gas outlet system: Please see Step 4 below for required materials and construction

Tools required

Do not require many tools here. A hack saw blade for cutting the cans & pipes and a sharp knife for cutting holes on the cans are all the tools we need.

Additional accessories

A single burner bio-gas stove or a Bunsen Burner used in school laboratories

Step 1:

Bought this 50 ltrs capacity PVC can, which will act as the digester unit and removed the top portion of the can, by cutting it with a hack saw blade:
<p>hello sir,</p><p>can i use aluminium dig ester coated with black co lour instead of FRP digester ? i think metal can increase the temperature inside the chamber</p>
<p>Hello sir every time we need cow dunk or first time only because i live in city area.every time cow dunk is not available.from only wastage item from kitchen,organic things,fruit peels can be made or not please clear me.</p>
<p>only starting time we need cow dung than after there is no need of cow dung to run bio-gas plant unless bacteria inside the digester died.</p>
There is no need to use cow dung slurry every time. it is required only during the first time to start the digestion process. Afterwards you can all kitchen, food and organic wastes directly in the digester
<p>hell sir,what is the different between decomposable &amp; decompostable materials.i search the list of decomposable items on net but net shows compostable items only.are they same or diffirent ? </p>
<p>sir i am very interested for this job,by this method we get success or it is only try.could you please clearly mention that which which things can we use for this job.</p>
<p>this is a working prototype being used to explain how the biogas digester works</p>
I could not reply to you earlier as my system was down.<br><br>Using any metal bodies as digester or gas holder is not advisable. About 40 years back, during the initial stages of Biogas plants in India, they used metal sheets for the gas holder, but none of them are functioning now. The reason metal got eroded in the slurry and gas started leaking.
<p>Thank you, sir</p>
AJAY KHEDKAR:<br>hello sir, i am civil engineering student from INDIA.I am doing my final year project on clean and green energy village under which we are designing Bio Gas plant for village and we require your support for that <br> 1.what are standard design steps for Bio gas plant design? <br> 2.what are various material can be used instead of cow dung?<br> also plz give your innovative suggestion for CLEAN AND GREEN ENERGIES that can be use in villages
Please go through my other instructables on biogas at the following links<br><br>How to Build a Medium sized Biogas Plant<br><br>http://www.instructables.com/id/Constructing-a-Medium-Sized-Biogas-Plant-Using-Kit/<br><br>Make Energy from weeds<br><br>http://www.instructables.com/id/Make-Energy-From-Weeds/<br><br>You can also download more files like Designing the Biogas System and construction details larger fixed dome models from the Dropbox link below...<br><br>Designing Biogas System<br><br>https://www.dropbox.com/s/4v7s1vcbwg1uhti/Designing%20biogas%20system.pdf?dl=0<br><br>Balaji Biogas system<br><br>https://www.dropbox.com/s/dyzqhplp1bjtrnr/Balaji%20Biogas%20system.pdf?dl=0<br><br>Deenbandhu Type Biogas plant Construction Manual<br><br>https://www.dropbox.com/s/yc1mql1aoyrvz92/Constrution%20manual%20Deenbandhu%20type%20Bio-gas%20plant.pdf?dl=0
<p>Hello sir.That's really a very good idea.sir,I want to use biogas for heating in pyrolysis of plastics.I would like to know whether this plant can be use for this purpose?</p><p>thank you</p>
This is a prototype of a Biogas plant, which can not be used other than School Science projects
<p>Hello! I love your idea. I am going to use it for science fair this year, but we don't own a bio-gas stove. However, we do own a propane stove. Could that be used instead? Thanks a lot!</p>
You can not use a propane stove for Biogas. Instead use a Bunsen Burner which is available in almost all school laboratories, or you can buy it online. It is very cheap.
<p>Thank You!! I really appreciate your help!</p>
Hello am Allan from Uganda, but in our country we are eatting up the green cover. But i believe such knowledge ( biogass) will be a great deal for our locals , so wat am asking ,for a 100 Litre drum how much gobar is need and how much water is needed for the start and for how long will the gas produce? And is ther any catalysist to speed up the reaction? Thank very much
Fill the tank initially to about 1/3 with cow dung slurry. If you can fill with more cow dung, it is better. For 100 ltrs drum, use about 500 to 750 grams of material with about 2 ltrs of water. Gas production will start within few days. No catalysts are required to speed up the process
<p>Thank you very much sir, please how soon are you to change the waste material.</p>
You need not to change the waste material. Feed the digester regularly everyday and the digested slurry will be automatically drained out through the outlet pipe.
Absolutely great method to recondition batteries: http://batteryrecover.com<br><br>Thank you Gregory ! :)
<p>Hello... i like this</p>
Thank you...
Hello sir,<br> Can I use wooden dust and chips to form slurry for biogas plant.
Do not use wooden dust and chips in the Biogas digester
<p>okey , Thank you sir , i will take your suggestion as my top most priority, but i want ask one more thing that for agriculture residue or soft wood waste like pine needles etc, should we need pre -digestion process ? or could we directly pore these kinds of waste into main dig ester after shredding? </p>
<p>I am not aware of pine needles and soft wood waste being used in Biogas plant. You can use the following material for feeding Biogas digester. Just shred with water and feed:</p><p>Cow manure, Pig manure, Chicken manure, Brewery waste, Green clippings, Grass silage, Corn silage, Food scraps, Bakery waste and Fats &amp; Grease</p>
<p>while making bio gas for higher capacity pre-treatment process does so which would be better aerobic or anaerobic pre- treatment process?</p>
No pre-treatment required other than shredding the waste material in to fine pieces. There are many food / kitchen and organic waste shredders available in the market in various capacities. You can install one based on the quantity of waste you can collect every day at the inlet of the Biogas digester. This will highly improve the biogas production
<p>sir, while pre-treatment process which one aerobic pre treatment or anaerobic pre treatment will be better ?</p>
<p>Pre-treatment for what ?</p>
What is the guide pipe sir??Anybody got an answer....
Actually, you do not require a guide pipe, if you can balance the gas holder tank. Otherwise, the gas holder tank will tilt to one side when it is filled with gas. The guide pipe will keep it straight and the gas holder will move up and down along the guide pipe without tilting
<p>THANKS FOR THE REPLY &quot;ANTONIRAJ&quot;. </p><p> I HAVE SEEN SOME VIDEOS WHERE SOME READY MADE CULTURE IS AVAILABLE IN THE MARKET WHICH CAN BE USED TO START AND SPEED UP THE ANAEROBIC PROCESS. IT IS AVAILABLE IN SMALL PLASTIC BOX. DO YOU KNOW SOMETHING ABOUT IT? </p><p>THE REASON I INSIST ON NOT USING COW DUNG IS THAT BECAUSE OF OUR RELIANCE ON COW DUNG, BIO GAS CAN BE USED ONLY IN RURAL AREAS. TO BE VERY FRANK, NO ONE WANTS TO MESS AROUND WITH COW DUNG. I HAD A FRIEND WHO HAD A BUFFALO AND HAD SET UP A BIO GAS PLANT AND WAS HAPPY WITH IT. </p><p>AFTER A FEW YEARS WHEN THE TOPIC CAME UP AGAIN FOR DISCUSSION, HE SAID THAT THEY HAD STOPPED THE BIO GAS PLANT BECAUSE THE MEN AND WOMEN OF THE HOUSE HOLD DID NOT WISH TO DO SUCH MENIAL JOBS. I SUPPOSE DEALING WITH VEGETABLE WASTE IS MUCH MORE BEARABLE THAN COW DUNG.</p><p>THEREFORE I BELIEVE THAT VEGETABLE WASTE SHOULD BE USED.</p><p>THANKS.</p>
Waste water treatment plants use such starter cultures instead of cow dung slurry. You can inquire with the waste water treatment department in your area. I hope you will get the starter culture from them
I have spend more money in dairy farm and no profit gain so please give money efficient project ..by this project how much gas produced ...
<p>you can construct a larger model Biogas plant and use the gas to run Biogas Generator, stove and lighting. Please download few Biogas related files from the following dropbox link and go through them</p><p>https://www.dropbox.com/sh/hjpq1o8qbe3r8db/AAD63dDpvb3SMSCye_eXPeRca?dl=0 </p>
<p>SIR,</p><p>I WANT TO USE ONLY VEGETABLE WASTE WITHOUT USING COW DUNG. NOT EVEN AS STARTUP PROCESS. IS IT POSSIBLE TO DO SO? THE SMALL SIZE BIO GAS PLANT AS SHOWN IN THE PICTURE, CAN IT GIVE ME 10 MINUTES OF COOKING GAS ON 1 STOVE FOR SAY 2 KG OF VEGETABLE WASTE DAILY? PLEASE GUIDE.</p><p>THANKS.</p>
You can use vegetable waste only without cow dung to start the process, but it will take very long.<br><br>This small size Biogas plant is just a model. You can feed about 250 grams of waste per day which will give about 100 grams of biogas. It will not burn for 10 minutes as quantity is very small
<p>Hi, antoniraj. That's a great set up you have there!<br>I'm from Brazil and I'm writing about biogas for a college course. I'd like to know what did you use as the substrate and what was the yield you got from the system you described here. Actually, I'd really appreciate if we could talk more about it by skype or e-mail.</p><p>Thank you!<br>Best regards.</p>
You can see my other two instructables on Biogas on the following links. I hope these instructables will give you more information<br><br>http://www.instructables.com/id/Constructing-a-Medium-Sized-Biogas-Plant-Using-Kit/<br><br>http://www.instructables.com/id/Make-Energy-From-Weeds/<br>
Sir i have a dairy farm .i spend more money for generator fuel everage 15000 rupee per month please advise me for biogas plant ...in less money
<p>sir i would like to separate the co2 from biogas and i would like to use it as raw material for other industries is it possible ?</p>
<p>how the floating dome was fixed....without gas escaping??????</p>
Actually the floating dome was not fixed. You can place the floating drum without the central guide pipe also. In that case the floating drum may tilt to one side due to the gas pipe line.<br><br>Please go through my other instructable on constructing a medium sized Biogas plant at the following link, which will clarify your doubt<br><br>http://www.instructables.com/id/Constructing-a-Medium-Sized-Biogas-Plant-Using-Kit/
<p>how sir ? how can i use some part of biogas to heat the digester, by adding hot water in it?</p>
You can use biogas to heat water to be warm for mixing with waste material
<p>i also trying to make a small black colour plastic hut around the digester so that it can trap the sun heat and makes the digester around hotter. if any further requirement is needed please sir it my pleasure to take your advise to</p>

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