Explain the working of a bio gas plant with neat diagram.

A biogas plant is a system that converts organic waste materials, such as animal dung, agricultural waste, food scraps, and sewage, into biogas through the process of anaerobic digestion. Biogas primarily contains methane (CH₄) and carbon dioxide (CO₂), with traces of hydrogen sulfide (H₂S), water vapor, and other gases. This gas is a renewable and eco-friendly source of energy, which can be used for cooking, lighting, and even for generating electricity. The residue from the process, called slurry, is a rich organic fertilizer.

The working of a biogas plant can be explained in the following steps:

Raw Material Collection:
The main raw materials used in a biogas plant are cow dung, agricultural waste, kitchen waste, and sometimes human waste. These materials are collected in a mixture form, usually mixed with water to create a slurry of suitable consistency. This ensures easy flow and decomposition in the digester.

Feeding the Slurry:
The prepared slurry is poured into an inlet tank. From the inlet tank, the slurry moves into the digester through an inlet pipe. The digester is a large, sealed, airtight chamber made of brick, concrete, or ________ ________ ____ _______ __________ _________ _______ ______ _______.
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