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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:

Step 2:

The smaller white can, which will act as the gas holder fits inside the red one. Here, again removed the top of the white can, also with the help of a hack saw blade:

Step 3:

64 mm, 32 mm and 25 mm dia PVC pipes which  will be used for feeding the kitchen waste, guide pipe for the gas holder and guide pipe fixed with the digestion chamber respectively. A small piece of 32 mm dia pipe will be used as outlet for the slurry:

Step 4:

  1. items required for the gas delivery system: got these items from a hardware store

1. Ball valve : one no ( to adjust the gas flow)
2. 'T' joint : one no ( to connect the gas holder and the ball valve)
3. Cap to block one end of 'T' joint : one no
4. Coupling or Adapter : one no (to connect vertical end of 'T' in to the gas collector)
5. Nipple: one no (added to the coupling in to the gas collector)
6. Gas pipe (flexible) : two meters
7. Barb : one no (fitted with the gas pipe, to join with the Ball valve)
8. Clip : one no (used for crimping the barb with the gas pipe and make it leak-proof)
9. Teflon tape : one roll (used as thread tape in all joints)

Step 5:

Here I have marked the cuts to be made in the bottom of the gas collection tank. The smaller hole on the left for gas delivery system, center hole for fixing the 32 mm guide pipe and 64 mm hole for fixing the waste feeding pipe on the right side. Made these holes with the help of a sharp knife and hack saw blade.

The next image is Inside of the gas holder showing the 32 mm guide pipe (center) and the 64 mm feeding pipe fixed with M-seal

Step 6:

Top view of the gas holder showing the feeding pipe, central guide pipe and the gas delivery system: I have closed the feeding pipe withe an old lid  (red one). This will facilitate opening the feed pipe only during feeding the system.

Step 7:

Digestion tank fitted with the central guide pipe and the outlet pipe for the slurry:

Step 8:

Completed unit. I have removed the gas pipe, so that the joints will get cured without any stress:

Wait for a day or two before feeding the system, allowing all joints to get cured and become leak-proof.

Initially, cow-dung mixed with water will be fed in to the system, which will start the gas formation process. Subsequently, food waste, decomposable organic material and kitchen waste will be diluted with water and used to feed the system. The gas holder will rise along the guide pipes based on the amount of gas produced. We can add some weight on top of the gas holder to increase the gas pressure. When we feed the system, the excess digested slurry will fall out through the outlet pipe, which can be collected, diluted and used as organic manure.

Initial production of gas will consist of oxygen, methane, carbon di oxide and some other gases and will not burn. These gases can be released to the atmosphere by opening the ball valve at least three / four times.

Subsequent gas will consist of about 70 to 80 percent methane and the rest carbon di oxide, which can be used in a single bio-gas burning stove or a Bunsen burner.

Total cost of this proto-type system is about one thousand Indian Rupees (about 20 dollars)

This is a basic prototype of a Bio-gas system using the food waste, decomposable organic material and kitchen waste to produce gas. An one thousand litre capacity Digestion tank will be sufficient for a small household for daily cooking purpose. The bigger commercial models provide a water seal between the digestion tank and gas holder tank.

You can get further information on kitchen waste based mini Bio-gas plant at the following links:

http://e-biogas.blogspot.in/

http://www.samuchit.com/index.php?option=com_content&view=article&id=8&Itemid=10

Step 9:

Charged the digester tank with cow dung diluted with water. Placed the gas holder tank and left it for two three days. The cow dung slurry started the process of gas forming.

Gas formation started and the gas holder tank gets lifted up. I have placed two bricks on top of the gas holder to get more gas pressure.

Step 10:

Note for students who are doing this as their School Project:

1. Take guidance from your teacher while using the gas in a stove or Bunsen burner.
2. Collect surplus food and wastage during lunch, dilute and feed the system.
3. Fruit peels, extracted tea powder, waste milk and milk products  can also be used for feeding the system.
4. DO NOT USE eggshells, Onion peels or left-over bones in this system as they will affect the efficient functioning of the system
5. Plant some seedling
6. while feeding, collect the slurry from the outlet, feed the seedlings and watch them grow
1. One 10m3 biogas digester plastic<br>2. One Equivalent final gas container<br>3. One gas purifier(mainly co2 and h2s)<br>4. One gas compressor<br>5. One gas cylinder (to reserve 30 days gas for 5 members family/daily 3 hours burning)<br>6. Pipes for adjusting the whole system<br>7. One stove for biogas<br>Can u please advise on structure and the whole system alongwith approx budget to my email...mepoux@gmail.com
<p>Sir, can you please send the file related to design and operation of this biogas plant it will be of great help.. my ID is nandhini_125@yahoo.co.in</p>
<p>I built my own bioplant and now create my own electricity using WWW.BIOGASPLANT.INFO -- I literally slashed my energy bill by 80% by making biogas! I didn't have to invest in any expensive solar panels or generators (so expensive!) - all I did was follow the steps listed on that website to build my own biogas plant. If I can do it, anybody can...seriously! It's a great tool that will explain everything step-by-step for you.Everybody has enough energy to power their home using nothing but items you already have. I've never seen anything like this before! I was so furious that I spent so many years giving the big electric companies my money. Going off the grid was the best idea I've ever had! It's impossible to overstate how invaluable the money I've saved has been for my family and I. It's very easy to make your own power!</p>
<p>I built my own bioplant and now create my own electricity using WWW.BIOGASPLANT.INFO -- I literally slashed my energy bill by 80% by making biogas! I didn't have to invest in any expensive solar panels or generators (so expensive!) - all I did was follow the steps listed on that website to build my own biogas plant. If I can do it, anybody can...seriously! It's a great tool that will explain everything step-by-step for you.Everybody has enough energy to power their home using nothing but items you already have. I've never seen anything like this before! I was so furious that I spent so many years giving the big electric companies my money. Going off the grid was the best idea I've ever had! It's impossible to overstate how invaluable the money I've saved has been for my family and I. It's very easy to make your own power!</p>
<p>I built my own bioplant and now create my own electricity using WWW.BIOGASPLANT.INFO -- I literally slashed my energy bill by 80% by making biogas! I didn't have to invest in any expensive solar panels or generators (so expensive!) - all I did was follow the steps listed on that website to build my own biogas plant. If I can do it, anybody can...seriously! It's a great tool that will explain everything step-by-step for you.Everybody has enough energy to power their home using nothing but items you already have. I've never seen anything like this before! I was so furious that I spent so many years giving the big electric companies my money. Going off the grid was the best idea I've ever had! It's impossible to overstate how invaluable the money I've saved has been for my family and I. It's very easy to make your own power!</p>
<p>I built my own bioplant and now create my own electricity using WWW.BIOGASPLANT.INFO -- I literally slashed my energy bill by 80% by making biogas! I didn't have to invest in any expensive solar panels or generators (so expensive!) - all I did was follow the steps listed on that website to build my own biogas plant. If I can do it, anybody can...seriously! It's a great tool that will explain everything step-by-step for you.Everybody has enough energy to power their home using nothing but items you already have. I've never seen anything like this before! I was so furious that I spent so many years giving the big electric companies my money. Going off the grid was the best idea I've ever had! It's impossible to overstate how invaluable the money I've saved has been for my family and I. It's very easy to make your own power!</p>
<p>I built my own bioplant and now create my own electricity using WWW.BIOGASPLANT.INFO -- I literally slashed my energy bill by 80% by making biogas! I didn't have to invest in any expensive solar panels or generators (so expensive!) - all I did was follow the steps listed on that website to build my own biogas plant. If I can do it, anybody can...seriously! It's a great tool that will explain everything step-by-step for you.Everybody has enough energy to power their home using nothing but items you already have. I've never seen anything like this before! I was so furious that I spent so many years giving the big electric companies my money. Going off the grid was the best idea I've ever had! It's impossible to overstate how invaluable the money I've saved has been for my family and I. It's very easy to make your own power!</p>
<p>I built my own bioplant and now create my own electricity using WWW.BIOGASPLANT.INFO -- I literally slashed my energy bill by 80% by making biogas! I didn't have to invest in any expensive solar panels or generators (so expensive!) - all I did was follow the steps listed on that website to build my own biogas plant. If I can do it, anybody can...seriously! It's a great tool that will explain everything step-by-step for you.Everybody has enough energy to power their home using nothing but items you already have. I've never seen anything like this before! I was so furious that I spent so many years giving the big electric companies my money. Going off the grid was the best idea I've ever had! It's impossible to overstate how invaluable the money I've saved has been for my family and I. It's very easy to make your own power!</p>
<p>I built my own bioplant and now create my own electricity using WWW.BIOGASPLANT.INFO -- I literally slashed my energy bill by 80% by making biogas! I didn't have to invest in any expensive solar panels or generators (so expensive!) - all I did was follow the steps listed on that website to build my own biogas plant. If I can do it, anybody can...seriously! It's a great tool that will explain everything step-by-step for you.Everybody has enough energy to power their home using nothing but items you already have. I've never seen anything like this before! I was so furious that I spent so many years giving the big electric companies my money. Going off the grid was the best idea I've ever had! It's impossible to overstate how invaluable the money I've saved has been for my family and I. It's very easy to make your own power!</p>
<p>I built my own bioplant and now create my own electricity using WWW.BIOGASPLANT.INFO -- I literally slashed my energy bill by 80% by making biogas! I didn't have to invest in any expensive solar panels or generators (so expensive!) - all I did was follow the steps listed on that website to build my own biogas plant. If I can do it, anybody can...seriously! It's a great tool that will explain everything step-by-step for you.Everybody has enough energy to power their home using nothing but items you already have. I've never seen anything like this before! I was so furious that I spent so many years giving the big electric companies my money. Going off the grid was the best idea I've ever had! It's impossible to overstate how invaluable the money I've saved has been for my family and I. It's very easy to make your own power!</p>
<p>I built my own bioplant and now create my own electricity using WWW.BIOGASPLANT.INFO -- I literally slashed my energy bill by 80% by making biogas! I didn't have to invest in any expensive solar panels or generators (so expensive!) - all I did was follow the steps listed on that website to build my own biogas plant. If I can do it, anybody can...seriously! It's a great tool that will explain everything step-by-step for you.Everybody has enough energy to power their home using nothing but items you already have. I've never seen anything like this before! I was so furious that I spent so many years giving the big electric companies my money. Going off the grid was the best idea I've ever had! It's impossible to overstate how invaluable the money I've saved has been for my family and I. It's very easy to make your own power!</p>
<p>I built my own bioplant and now create my own electricity using WWW.BIOGASPLANT.INFO -- I literally slashed my energy bill by 80% by making biogas! I didn't have to invest in any expensive solar panels or generators (so expensive!) - all I did was follow the steps listed on that website to build my own biogas plant. If I can do it, anybody can...seriously! It's a great tool that will explain everything step-by-step for you.Everybody has enough energy to power their home using nothing but items you already have. I've never seen anything like this before! I was so furious that I spent so many years giving the big electric companies my money. Going off the grid was the best idea I've ever had! It's impossible to overstate how invaluable the money I've saved has been for my family and I. It's very easy to make your own power!</p>
<p>Sir, can you please send the file related to structure size ( according to waste material ) to my ID manojaudichya5070@gmail.com</p>
<p>I built my own bioplant and now create my own electricity using WWW.BIOGASPLANT.INFO -- I literally slashed my energy bill by 80% by making biogas! I didn't have to invest in any expensive solar panels or generators (so expensive!) - all I did was follow the steps listed on that website to build my own biogas plant. If I can do it, anybody can...seriously! It's a great tool that will explain everything step-by-step for you. Everybody has enough energy to power their home using nothing but items you already have. I've never seen anything like this before! I was so furious that I spent so many years giving the big electric companies my money. Going off the grid was the best idea I've ever had! It's impossible to overstate how invaluable the money I've saved has been for my family and I. It's very easy to make your own power!</p>
<p>I built my own bioplant and now create my own electricity using WWW.BIOGASPLANT.INFO -- I literally slashed my energy bill by 80% by making biogas! I didn't have to invest in any expensive solar panels or generators (so expensive!) - all I did was follow the steps listed on that website to build my own biogas plant. If I can do it, anybody can...seriously! It's a great tool that will explain everything step-by-step for you. Everybody has enough energy to power their home using nothing but items you already have. I've never seen anything like this before! I was so furious that I spent so many years giving the big electric companies my money. Going off the grid was the best idea I've ever had! It's impossible to overstate how invaluable the money I've saved has been for my family and I. It's very easy to make your own power!</p>
<p>I built my own bioplant and now create my own electricity using WWW.BIOGASPLANT.INFO -- I literally slashed my energy bill by 80% by making biogas! I didn't have to invest in any expensive solar panels or generators (so expensive!) - all I did was follow the steps listed on that website to build my own biogas plant. If I can do it, anybody can...seriously! It's a great tool that will explain everything step-by-step for you. Everybody has enough energy to power their home using nothing but items you already have. I've never seen anything like this before! I was so furious that I spent so many years giving the big electric companies my money. Going off the grid was the best idea I've ever had! It's impossible to overstate how invaluable the money I've saved has been for my family and I. It's very easy to make your own power!</p>
<p>please see the attached files sent to your mail</p>
thank you so much for reply . please sir do me one more favour i want information about plant size according to weight of waste(vegetable waste)..please send me information related to waste material. <br><br>
<p>For 1 to 1.5 kilogram of kitchen waste every day, you need a digester size of about 200 liters</p>
<p>I built my own bioplant and now create my own electricity using WWW.BIOGASPLANT.INFO -- I literally slashed my energy bill by 80% by making biogas! I didn't have to invest in any expensive solar panels or generators (so expensive!) - all I did was follow the steps listed on that website to build my own biogas plant. If I can do it, anybody can...seriously! It's a great tool that will explain everything step-by-step for you.Everybody has enough energy to power their home using nothing but items you already have. I've never seen anything like this before! I was so furious that I spent so many years giving the big electric companies my money. Going off the grid was the best idea I've ever had! It's impossible to overstate how invaluable the money I've saved has been for my family and I. It's very easy to make your own power!</p>
<p>I built my own bioplant and now create my own electricity using http://www.BioGasPlant.info -- I literally slashed my energy bill by 80% by making biogas! I didn't have to invest in any expensive solar panels or generators (so expensive!) - all I did was follow the steps listed on that website to build my own biogas plant. If I can do it, anybody can...seriously! It's a great tool that will explain everything step-by-step for you. Everybody has enough energy to power their home using nothing but items you already have. I've never seen anything like this before! I was so furious that I spent so many years giving the big electric companies my money. Going off the grid was the best idea I've ever had! It's impossible to overstate how invaluable the money I've saved has been for my family and I. It's very easy to make your own power!</p>
<p>Sir can you pls send file for a domestic biogas at home. I have used 120ltr tank as digester and 60ltr tank as Gas holder. I have some questions:</p><p>how long does it take to digest and produce gas?</p><p>should fertilizer be added simultaneously with food waste or after that? Please give time.</p><p>about stove, what should be its features? </p><p>I would be appreciate if you possibly send me file and answers to my mail:</p><p>reprisal85@yahoo.com</p>
<p>please see attached files sent to your mail. for a 120 liter digester tank you should use a 100 liter capacity gas holder. Otherwise there will be a large gap between both tanks which will lead to loss of gas.</p><p>Initially it will take about a week to get gas. Afterwards you will get regular supply of gas by feeding the digester regularly.</p><p>Do not add any fertilizer.</p><p>Biogas stove is different from normal stove with larger nozzle and burner holes</p>
<p>Please sir can I get the file in my mailbox: thassan07@gmail.com?</p>
<p>please see attached files sent to your mail</p>
Hello, i want to use 1000 liter water tank as digester and 20 liters container as gas cylinder for storage...how much cowdung and water i should give in digester perday/permonth? How many 1000 liter tank i need? I want to purify gas using NaCo3 for co2...but dont know how to purify H2S from the gas.....can anyone help please????
<p>for a 1000 liter digester, use about 750 liter capacity gas holder tank. Feed about 8 to 10 kilograms of cow dung per day. You will get about 1500 to 2000 grams of Biogas based on the climate. Dilute the cow dung with about 3 to 4 times water. Purification of Biogas is not economical for a 1000 liter capacity digester</p>
The calculation below is true? Possible?<br>1000 liter digester, 50 kg cow dung per day will produce 12.5 kg biogas per day......<br><br>Please help me to verify if the above calculation is true or false. .
<p>In a 1000 liter digester tank, you can not feed more than 8 to 10 kilograms of cow dung per day. Otherwise the output slurry will have mostly undigested materials.</p>
Sir can get the file on my id nikhildua96@gmail.com
Please see attached file sent to your mail
<p>Sir, can you please send the file to my ID baloloyalysa@yahoo.com</p><p>Thank you.</p>
<p>please see attached file sent to your mail</p>
<p>Thank You Sir.</p>
<p>Hello Sir!,</p><p>Can you please send me details on how to build or construct fixed dome type of biogas digester for pig dungs? At present, we have 4 sows and after they gave birth we will raise the piglets for fattening.. What will be the volume or area of the tank suited for that number of pigs? And is it ok if we continuously put in the dungs with water daily? Thank you!! (crystelrodrigueza@yahoo.com.ph)</p>
<p>please go through attached files sent to your mail. plan for a 2 to 3 cum capacity tank considering future expansion. you can add the diluted waste everyday to the plant</p>
Thanks a lot sir! Does adding the diluted waste everyday will not affect the gas production?
<p>you have to add diluted waste everyday to get regular gas supply. If you do not add regularly then your gas production will be affected</p>
Do i have to put a stirrer sir for a fixed dome type?
<p>stirrer is not necessary, but if you can install one that is good</p>
<p>Goodmorning Sir,</p><p>Thank you so much for sharing your knowledge, it is very useful!</p><p>I work for an NGO in Zambia; we would like to suggest this plant in rural areas. Unfortunately, I don't get the point on:</p><p>- how much organic waste (kitchen and agricultare waste) we shoud use for feeding the system;</p><p>- what is the ratio waste/water;</p><p>- how many time per day or week we have to feed the system;</p><p>- when we can use the fluid inside the digestor to fertilise the soil.</p><p>Could you please write me at my email address? It is saverio.ragazzi@gmail.com</p><p>Thank you very much,</p><p>Hope the best for your activities,</p><p>Saverio</p>
<p>This model is a small working prototype of a Biogas Plant. To get any usable gas, you should have a minimum 200 liters digestion tank.</p><p>Regarding your queries,</p><p>- use about 500 grams of organic waste for 100 liters capacity of digester. that means in a 1000 liter capacity digester tank you can feed about 5 kilograms of waste.</p><p>- use about 3 to 3.5 liters of water per kilogram of food waste</p><p>- feed the plant once everyday to get the optimum gas output.</p><p>- the digested slurry will fall out through the outlet pipe. you can collect and use it as fertilizer.</p><p>Please also go through my other instructables on &quot;Construction of a Medium sized Biogas Plant&quot; and &quot;Make Energy from weeds&quot; at the following links:</p><p><a href="http://www.instructables.com/id/Constructing-a-Medium-Sized-Biogas-Plant-Using-Kit/">http://www.instructables.com/id/Constructing-a-Med...</a></p><p><a href="http://www.instructables.com/id/Make-Energy-From-Weeds/">http://www.instructables.com/id/Make-Energy-From-W...</a></p>
<p>Thank you very much for your kind reply.</p><p>But is this model (50 litres) useful for making gas? Can a small family use it or it is just a theoretical model and it is necessary a bigger plant (as you said, at least 200 litres)? In this case, should we double the amount of food waste and water compared to the 100 liters plant? And if we use a 50 liters can, should we half the waste and water amounts?</p><p>Many thanks,</p><p>Saverio</p>
<p>this a prototype model useful for students doing school project. The gas produced from 50 liters digester is not sufficient for a small family. Calculate the amount of food waste and water as I mentioned in my earlier reply</p>
<p>Hello Sir, </p><p>Please, how do I generate energy from my pig dung? I intend to power the farm with the energy. It's a small farm though. I will appreciate any material you can send. </p><p>Thank you. </p><p>Michael, moyagha@yahoo.com </p>
<p>HELLO!! sir the steps are clear to me but i m really unable to understand the working process means how with the slurry or the remaining waste comes out and how is this floating mechanism work?? </p><p>can i get the few more details about this design please mail me at</p><p>email- rhulmeena8@gmail.com </p>
<p>the working method of this plant is very simple. when the gas is produced it raises up and tries to escape to the atmosphere. this gas is stopped by the sealed gas collector. when more gas is collected, the gas collector naturally floats up.</p><p>when you feed diluted organic waste into the digester, the slurry level in the tank raises up. as there is an outlet on top, the slurry drains out through the opening. since the digested slurry is lighter than the fresh feed material, the drained out slurry is almost fully digested and can be used as manure.</p><p>please also go through attached files sent to your mail</p>
<p>Hello,</p><p>I would like to have some more info about a mini bio-gas plant...</p><p>I'm trying to understand if it's possible to install a mini plant on a caravan or a camping car...to product gas for a field kitchen unit!</p><p>-Moving it could be a problem?</p><p>-More or less how long does it take to digest and produce gas(witch kind of..?) and at how many degree?</p><p>-And how many gas can I produce in that time? Can I use it continuously?</p><p>thanks for now</p><p>you can answer me at fr.gilli.bo.i@gmail.com</p><p>bye</p>
This is a prototype and will not produced much gas. You need a minimum of 200 liters capacity digester to get some usable gas.<br><br>You can do some modifications and install the biogas digester in a caravan:<br><br>1. Instead of the floating gas holder use some think like an inflatable arrangement like a balloon to store the gas. You also need to fix the digester firmly with the caravan. Moving the plant could be a problem <br><br>2. The slurry outlet to be taken from just above the bottom to prevent gas leakage. You can also close a outlet while moving.<br><br>3. Once you started feeding the digester, you will get burnable gas in about 10 to 15 days. The digester needs a warm climate to produce gas efficiently. Gas production will be less in severe winters.<br><br>4. for a 200 liter digester, you can feed about one kilogram of wastes everyday. You will get about 250 grams of gas from that<br><br>5. Yes you can use it continuously.<br><br>Another option is instead of going to the trouble of installing the digester in a caravan, place a large capacity plant on ground and fill the gas in car tyre tubes. With little modifications to the tubes, you can have few gas-filled tubes which you can use during camping
<p>I have try with L drum but after 20 days I didn't get any gas. Do I need to wait more? Please send me your experience so that I can correct my installation. gngaryagi@gmail.com</p>

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