railway RRB JE (CBT I + CBT II) Mock Test 2024 Environmental Engineering Sewage

The gases which are generally evolved during anaerobic decomposition of sewage are:

1
CO2 + NH3 + SO2 + CH4
2
CO2 + NH3 + SO2
3
CO2 + NH3 + H2S
4
CO2 + NH3 + H2S + CH4
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