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Which of the following is mainly produced by the activity of anaerobic bacteria on sewage?
A
Marsh gas
B
Laughing gas
C
Propane
D
Mustard gas
Detailed Solution
During sewage treatment, the activated sludge is pumped into anaerobic sludge digesters.
Here anaerobic bacteria (methanogens) digest the bacteria and fungi of the sludge and produce a mixture of gases: methane, hydrogen sulphide and carbon dioxide (biogas).
Methane is the main component; it is also called marsh gas because it is produced in the same way in marshes.
Laughing gas is nitrous oxide ($N_2O$), propane is a petroleum gas and mustard gas is a synthetic chemical warfare agent; none is formed in this way.
Hence marsh gas is mainly produced.
Here anaerobic bacteria (methanogens) digest the bacteria and fungi of the sludge and produce a mixture of gases: methane, hydrogen sulphide and carbon dioxide (biogas).
Methane is the main component; it is also called marsh gas because it is produced in the same way in marshes.
Laughing gas is nitrous oxide ($N_2O$), propane is a petroleum gas and mustard gas is a synthetic chemical warfare agent; none is formed in this way.
Hence marsh gas is mainly produced.