Biogas is a gas mixture produced by the fermentation of human and animal manure, straw, sewage, and other organic matter under anaerobic conditions. It is a natural, low-cost, renewable energy source. It can be directly burned for cooking, heating, lighting, and plays an indispensable role in energy-deficient or remote areas. But when the biogas is excessive, storage becomes a problem. If it is stored in a gas tank after being compressed according to the traditional method, the cost will be very high.

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