Biogas Plant Working

Biogas Production.

Bio gas is produced in the absence of oxygen, so you need to make the plant air tight. Biogas is produced by anaerobic bacteria. This anaerobic bacteria is present in animal excretions. Commonly used material for the working of biogas plant is cow dung which is easily available. That’s why we need to put cow dung in our biogas plant to start its working. The organic waste which we are putting into the plant is fermented by this anaerobic bacteria producing methane gas. This process is called anaerobic digestion or fermentation This methane gas combines with carbon dioxide and becomes biogas which will burn.

Waste which we can put into biogas plant.

Vegetables, kitchen waste, animal and birds excretion especially cow dung, fish and meat waste, waste water after washing rice meat fish etc and any degradable organic waste can be put into bio gas plant.

Waste which we should not put into biogas plant.

Metal, plastic, leaves (which will decay slowly) soap, chemicals, lemon and pineapple (which are acidic) should not be put into the biogas plant.

Benefits of a portable biogas plant

1. Space required for placing a plant is only one square meter.

2. It will help not only in waste management; we get gas required for cooking.

3. Amount of gas produced can be calculated by seeing the level of the gas collection chamber.

Things which we should take care.

1. Consider the capacity of the tank while putting waste materials. If you put more amount of waste than the capacity of the tank, it will lead to produce a bad smell around the tank.
2. Collected waste water from the tank has to be removed daily. This can be used as manure for plants.
3. There is a possibility that mosquitoes and flies will lay eggs in the small gap between the gas collection tank and the slurry tank. To avoid this pour a small amount of kerosene into that gap.
4. Methane gas which is produced in the plant is many times dangerous than carbon dioxide so you have to be careful in handling the gas. Biogas Stove should not be kept open. This gas will cause health problems.
5. Place the biogas plant as much as near to the kitchen, which will help you in increasing the gas pressure.
6. Plant some garden plants near the plant.

Home Made Bio gas Plant.

Portable Home Made Portable Bio gas Plant.

To make a bio gas plant we require two plastic containers of different sizes. The diameter difference between the two tanks should be between one to two inches. Here I took two plastic tanks one is a 240ltr tank and the other is 220ltr. The diameter difference is about 1.5 inch. These types of plastic tank are available in the local market. In this the smaller tank acts as the gas chamber and the bigger one acts as the slurry tank. There should be an inlet port on the slurry tank for filling the slurry to the tank daily. Inlet port should be made 6” above from the bottom of the tank. Inlet should have a diameter of 4”. And it should stand straight at least 4” above the surface of the slurry tank.

The outlet port is a 2” pipe fitted 2” below the top surface of the slurry tank. The out let pipe should have a minimal length 6”. Inlet and the out let pipe are to be in opposite directions The smaller tank is to be kept inside the bigger tank. This tank acts as the gas collection chamber. The gas produced inside the slurry tank is stored in this tank. There is an outlet port on this gas tank which is 1.5”in diameter. This 1.5” pipe has to be reduced to .5” using a PVC reducer and a valve have to be fitted at the end of this reducer. You have to use a pipe to hose connector to connect a hose from the gas chamber to the bio gas stove (LPG stove and Bio gas stove are different.).

Below is the video of my home made bio gas plant

http://www.youtube.com/watch?v=guDm2M3-tHU

More Details On

• Inlet Pipe Connection
• Outlet Pipe Connection
• Gas Collection Tank
• Gas Outlet Pipe
• First Step In Gas Production