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How is biogas from an anaerobic digester collected?

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How is biogas from an anaerobic digester collected?

(a) In a compressor

(b) In the pipelines

(c) In inverted drum

(d) In a storage tank

The question was asked in an interview for job.

My question is taken from Anaerobic Fermentation topic in chapter Biomass Energy of Energy Engineering

1 Answer

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Best answer
Correct choice is (c) In inverted drum

Explanation: The biogas in an anaerobic digester is collected in an inverted drum. The walls of the drum extended down into the slurry to provide a seal. The drum is free to move to accommodate more or less gas needed.

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