If the sewage is fully oxidized, the nitrogen is in the form of:

Question

Oxidized forms of nitrogen include nitrite (NO2) and nitrate (NO3). Nitrogen mainly occurs in wastewater in this form. Because nitrite is easily oxidized to nitrate, nitrate is the compound predominantly found in groundwater and surface waters.

4NH4O —> 4NH4(+) + 4OH(–)
4OH(–) —> 2H2O + O2
NH4 + O2 —> NO2(–) + 2H2O
2NO2(–) + O2 —> 2NO3(–)

GKToday Admin · Accepted Answer

Nitrates Oxidized forms of nitrogen include nitrite (NO2) and nitrate (NO3). Nitrogen mainly occurs in wastewater in this form. Because nitrite is easily oxidized to nitrate, nitrate is the compound predominantly found in groundwater and surface waters.

4NH4O —> 4NH4(+) + 4OH(–)
4OH(–) —> 2H2O + O2
NH4 + O2 —> NO2(–) + 2H2O
2NO2(–) + O2 —> 2NO3(–)

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