Biogas at Home- Cheap and Easy

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About: Brain of an Engineer, Heart of an Artist. 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

~

Snapchat and Instagram: @chitlangesahas

I'd love to connect with you guys on Snapchat and Instagram, I document the experience, learning lessons and also answer questions on those platforms. Looking forward to connect! Here is my username for both: @chitlangesahas


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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:

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3 People Made This Project!

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215 Discussions

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MugaruraJ

5 weeks ago

How can I apply that idear on my pit latrine and generate power.....which device will convert generated gas into power or electricity..

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MugaruraJ

5 weeks ago

Why is there a gap btn the digester tank and agas holder tank. Can't that let the gas escape

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JahmelB

9 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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shagunjain2005JahmelB

Reply 6 weeks ago

I wanted to ask the same question.... Please respond

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Kaypharo

Question 2 months ago on Step 4

The gas holder tank, is it covered on the other end or just insert in into the dung slurry?

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AnujS67

Question 3 months 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 5 months ago on Step 2

what was the size of this container?

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sb54

Question 7 months ago on Introduction

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

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itsDutt

Question 8 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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etruth

Question 11 months ago on Step 7

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

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PaulM676

11 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 11 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!