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The main constituents of gas generated during the anaerobic digestion of sewage sludge are
  • a)
    Carbon dioxide and methane
  • b)
    Methane and ethane
  • c)
    Carbon dioxide and carbon monoxide
  • d)
    Carbon monoxide and nitrogen
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
The main constituents of gas generated during the anaerobic digestion ...
Anaerobic digestion is normally adopted for primary sludge because primary sludge contains large amount of readily available organics that would induce rapid growth, of biomass if treated anaerobically.
Anaerobic decomposition process produce less biomass and primary function of anaerobic digester is to convert as much of sludge as possible to end products like liquid and gases while producing little biomass.
Waste-water contains wide varieties of organism.
These organisms are broadly classified as
a) Acid formers
b) Methane formers
Acid formers: Acid formers consists of facultative and anaerobic bacteria and include organisms which solubilize the organic acid through hydrolysis.The soluble end products are then fermented to acids and alcohol of lower molecular weight.
Methane formers: Methane formers are strictly anaerobic and converts acid and alcohol alongwith hydrogen and CO2 to methane.
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The main constituents of gas generated during the anaerobic digestion of sewage sludge area)Carbon dioxide and methaneb)Methane and ethanec)Carbon dioxide and carbon monoxided)Carbon monoxide and nitrogenCorrect answer is option 'A'. Can you explain this answer?
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