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During sewage treatment, biogases are produced which include:

  1. A
    Methane, hydrogen sulphide, carbon dioxide
  2. B
    Methane, oxygen, hydrogen sulphide
  3. C
    Hydrogen sulphide, methane, sulphur dioxide
  4. D
    Hydrogen sulphide, nitrogen, methane

Solution & Step-by-step Explanation

In the secondary treatment of sewage, anaerobic sludge digesters use bacteria to break down organic matter. This produces biogas, which is a mixture of methane (), hydrogen sulphide (), and carbon dioxide ().

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During sewage treatment, biogases are produced which include:
A
Methane, hydrogen sulphide, carbon dioxide
B
Methane, oxygen, hydrogen sulphide
C
Hydrogen sulphide, methane, sulphur dioxide
D
Hydrogen sulphide, nitrogen, methane

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