Green Fuel: Why Is Biogas So Important?

Biogas is a gaseous green fuel that is produce when organic matters like animal manure and plant materials decay in an air-tight chamber called a biogas/anaerobic digester. Biogas contains mainly methane (CH4), carbon dioxide (CO2) and small percentage of hydrogen sulphide (H2S). In a world plagued by environmental, economic and health problems as a result of the use of fossil fuel, replacing fossil fuels with green fuels like biogas will help in alleviating these problems as follows.

1. Methane Capture: When piles of organic matter decay, they give off some methane into the atmosphere. Methane is a powerful greenhouse gas that is about 21 times more effective in trapping heat from the earth than carbon dioxide. This simply means that methane is 21x worse than CO2. Once released, methane can remain in the atmosphere for as long as 15 years!

Apart from carbon dioxide, methane is another gas that is
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Biogas Technology: Types of Anaerobic Digesters

An anaerobic digester – also called a biogas digester or simply a digester – is an air-tight chamber that is used to produce biogas and a rich organic fertilizer called digestate. When you feed organic materials (also called feedstock, raw slurry etc.) like animal manure or plant wastes into an anaerobic digester, it will decompose in the absence of air to produce the two products previously mentioned.

The act of decomposing in the absence of air is called anaerobic digestion or simply digestion. So we can say that the anaerobic digester is digesting the feedstock fed into it. In this article, we’re going to focus only on the popular types of digesters.

Digesters are generally classified into batch-type and continuously-fed digesters base on the type of feeding/loading.

A. Batch-type Digester: In this type of digester, the feedstock is loaded into the digester and left there until anaerobic digestion is complete
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