The main type of sludge gas evolved during sewage treatment in Imhoff tank is___________________?
Correct answer: D. CH4
- A. CO2
- B. H2
- C. CO
- D. CH4
Explanation
Anaerobic digestion of sewage sludge in an Imhoff tank produces biogas, whose principal combustible component is methane. Carbon dioxide is also formed, but methane is the main sludge gas expected here.
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