Biogas at Home- Cheap and Easy

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About: I love the process of making things and it makes me happy!

Hi there, I am Sahas chitlange, aging 14, from India. here is my homemade cheap and easy to build mini Biogas plant. It burns for approx. 20-30 mins on a bunsen burner. you can add anything from your kitchen waste ( Exept Onion peels and eggshells). In 12 hours the Gas is ready for use. It is very easy and cost effective to build (only 2-3 dollars) and gives many useful products.

the end products of this system are:
1) Methane : (Can be used as a fuel)
2) Slurry     : (the spent slurry is exellent manure)

The main components oof this system are:

1)  Inlet pipe
2) digester tank
3) gas holder tank
4) slurry outlet pipe
5) gas outlet pipe


Pls leave a comment

Supplies:

Step 1: Chose the Correct Container

You will have to chose a correct size container which will act as a digester tank. My one is liters tank. I got it from scrap.

Step 2: Make Holes

Make holes in the tank for Inlet and outlet. For this I took a old iron rod and heated it to make holes. CAUTION: rod is really very hot.

Step 3: Fix the Inlet and Outlet Pipes

Glue the Inlet pipe and the Outlet pipe with any water proof adhesive. 

Step 4: Making the Gas Holder Tank

I took a paint bucket of 20 lts for making a gas holder tank. this tank holds the gas produced. The tank is overturned and fixed with a valve used for plumbing purposes.

Step 5: Time to Mix the Cow Dung !

mix the cow dung (5kg for 50 liters) and add water to  make a fine slurry. Now put the slurry in the digester tank.

Step 6: Almost Finished!

Put the gas holder tank overturned in the digester tank after adding the slurry . REMEMBER: open the valve while putting the gas holder tank. the mini plant takes 10-15 days for the first time to get output. For the first time, the gas in the tank wont burn as it contains Carbon Dioxide gas, if fortunately it burns then good or wait for the second time. You can detect how much gas is there in this system, the gas holder tank will rises up as the gas is produced.  

Step 7: Working Photos

The photos of the system working are provided....... the heat is so much that it melts a thin sheet of tin in just 2 mins!!!! if you like this i'able please like and comment....

Step 8:

3 People Made This Project!

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211 Discussions

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AnujS67

Question 1 day ago on Step 8

Just saw the entire process, want to understand 2 things
1) what is the inlet and outlet for.
2) why do have to put valve on the top and open it.

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cowsblike

Question 2 months ago on Step 2

what was the size of this container?

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sb54

Question 3 months ago on Introduction

Hi, very cool system. Are there any cautions on flammability/combustibility? thank you

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itsDutt

Question 4 months ago on Step 5

hy can i use kitchen waste + cow dung? is there any ratio about it or not?

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JahmelB

5 months ago on Step 8

I thought the anaerobic bacteria is only activated when oxygen isn't present. Is it ok for air to enter the system?

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etruth

Question 7 months ago on Step 7

i dont really understand what you did here can you please explain clearly

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PaulM676

7 months ago on Step 7

I like your idea is great for a starter,I will make this one as a proto type,because I am getting off the grid soon I only need to buy an inverter
Thank you. For your idea

Aussie. Paul. 12/10/2018

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JaiJ14

Question 8 months ago on Step 3

Why is the puspose of the pipes? Why is the design like that

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BireshwarS

Question 1 year ago on Step 8

Does it require any another chemical to add on it for the first time to generate the gas ?

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StarlyteAndreiafouto

Reply 1 year ago

The liquid left is amazing fertilizer, you could put in a drain off at a higher level than the working rest, and recuperate it.

I think it would maybe need diluting before direct plant application, as it must be pretty strong.

Gas and fertilizer in one go! Who could want more from their waste?

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josé antonioc3

3 years ago

the last picture confuses me, why the paint bucket is "floating". i belive that it must be well atachet and sealed inside the tank. i mean, i believe the tank must be completly sealed, except by inlet pipe, outlet pipe and the vale. if the gas holder thank is floating over the slurry, how much gas it can contain and how much gas scape from digester tank?

Last question, why do you put that bricks over the gas holder tank?

sincerely i hope you can answer. i am very interested in this proyect, but need more information and alternatives to use the cow dung. i live in the middle of the city and can't get it.

thanks for your attention

1 reply
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Starlytejosé antonioc3

Reply 1 year ago

The top bucket NEEDS to expand/move as it recuperates the gas.

I guess you could find a way to put a rubber seal round its' "path", between the muck bucket and the expansion bucket.

I was thinking about that too. Unless you are lucky enough to find 2 buckets, one that fits upside down in the other PERFECTLY, then I suppose you need a seal. Some one said he built a cage on the top of the gas bucket to stop it taking off, which seems to me a doable idea.

I love this project, it's the final touch for an autonom house!

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IdowuA

2 years ago

hello dear. i am Ben from Nigeria. i will like to teach my collegues and friends this method to generate biogas from kitchen waste and animal dung. I will appreciate if I can get more detailed instruction manual on how to make this home made Biogas if possible with video .

Much appreciated

My email addressess idayodele@gmail.com

1 reply
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StarlyteIdowuA

Reply 1 year ago

As you have internet try Youtube "Biogas converter DIY". Loads of videos on the same idea.

And what is left as liquid is great fertilizer, not toxic, and probably will need diluting or it will burn the plants, as it must be condensed.

Good luck, it's a great project!

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RickH106

2 years ago

Those plastic Barrels are very expensive in Uganda , out of reach for many people

We have build several using this method .

Bur we replaced the barrel ,with a hole on the ground ,and a strong plastic bag .

it has large capacity and produce more gas .... And the top of bag act as a gas storage tank ..

1 reply
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StarlyteRickH106

Reply 1 year ago

I don't know what is cheap or free in Uganda, but it might be good if you could use clay or cement or plaster to line the hole. Or mud and straw well mixed.

All is pretty solid, it makes houses, so to keep a hole air and water proof... no problem.

Then use the plastic bag on top for the gas.

Though I find your idea pretty good as it is.

My suggestions are just ideas in case it may help.

Good luck, and keep it going :D