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Biogas produced by anaerobic digestion consists chiefly of methane and

  • A.carbon dioxide
  • B.hydrogen
  • C.carbon monoxide
  • D.nitrogen

Answer: A

Roughly sixty per cent methane with most of the balance carbon dioxide gives a calorific value about three fifths that of natural gas. Removing the carbon dioxide and the hydrogen sulphide upgrades it to a pipeline-quality gas.

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