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Question

During sewage treatment, biogas is produced in

A
biological treatment plant
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B
anaerobic sludge digesters
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C
secondary treatment plant
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D
primary treatment plant
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Solution

The correct option is B anaerobic sludge digesters
Biogas is produced anaerobically in the anaerobic sludge digesters during the sewage treatment process. During this digestion, bacteria produce a mixture of gases such as methane, hydrogen sulphide and carbon dioxide. These gases form biogas.

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