Methane and Biogas 

There are many different type of methane and biogas plant designs. Two of the most prolific and basic designs are the Chinese fixed dome and Indian with floating gas holder as seen below.

The fixed-dome methane and biogas design elow consists of one lower segment (for the digester) and a hemisphere over it (for both digester and gas holder). The mixing tank is connected to the digester by pipe and when the new slurry is poured into the digester, a corresponding action occurs and material is pushed into the outlet tank which then overflows through another hole provided in the outlet tank.

The floating-drum methane and biogas plant has fairly deep digester underground and this is connected by inlet and outlet pipes. A steel gas holder drum, is inverted over the slurry, rising and falling depending on the accumulation and withdrawal of gas.

The bag-type plant is manufactured high-strength PVC-polyester fabric and other compounds. The bag system can be used with low-pressure stoves and lamps.These can be quite a lot cheaper but don't last for the same period of time as the two designs mentioned above. 

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