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During sewage treatment, biogases are produced which include:
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- methane, oxygen, hydrogen sulphide
- hydrogen sulphide, methane, sulphur dioxide
- hydrogen sulphide, nitrogen, methane
- methane, hydrogen sulphide, carbon dioxide
Correct Option: D
The major component of biogas is methane (about 50-68%) which is highly inflammable. The other gases are carbon dioxide (25 - 35%), hydrogen (1 - 5%), nitrogen (2 - 7%), Oxygen (0 - 0.1%) and rarely hydrogen sulfide. Biogas is a “mixture of gases” produced from degradable organic matter by the activity of various anaerobic bacteria that offers a low cost alternative for energy requirements.
