What is the principle of nitrification reaction to remove ammonia and nitrogen?

I, nitrification and denitrification mechanism:

1, nitrifying bacteria, including nitrosophilus and nitrifying bacteria, nitrosophilus will be converted to nitrite in the wastewater NH3, nitrifying bacteria will be converted to nitrite nitrate, known as nitrification. Nitrification must be completed by these two types of bacteria *** with the role.

2, denitrifying bacteria will nitrate into N2, NO, N2O, known as denitrification.

3, nitrifying bacteria must act under aerobic conditions.

4, denitrifying bacteria must act under anaerobic or anoxic conditions.

Two, the role of the equation:

Nitrification reaction:

2NH3 + 3O2- (nitrosophilic bacteria) -- 2HNO2 + 2H2O + energy (oxidation of ammonia) 2HNO2 + O2- -(nitrifying bacteria) -- 2HNO3 + energy (oxidation of nitrite)

Denitrification reaction:

NO3- + CH3OH --N2 + CO2 + H2O + OH- (with methanol as the C source)