Biogas digester temperature

How long you leave the material in a batch digester depends on temperature (2 weeks at 50°C up to 2 months at 15°C). 

The average is around 1 month – so gauge how much material you will add each day, and multiply it by 30 to calculate the size of the digester.

While anaerobic digestion occurs between 32° F (0°C) and 150° F (65°C), the optimum temperature range for methane generating microbial activity is 85°F (29°C) to 95° F (35°C).

Little gas production occurs below 60°F (16°C). 

In colder climates placing the digester in a greenhouse, and perhaps using some of the methane to warm the system, are possible strategies.
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