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Organic Nitrogen —> N H4+ by ammonifying bacteria <br />NH4+ +1.502 + 0.05 CO2 2 H+ + H2O + NO2_ <br />by Nitrosomonas bacteria <br />NO2- + 0.5 02 + 0.03 CO2 —> NO3- by Nitrobacter bacteria <br />Heterotrophic (organism requiring organic compounds for its principal source of food) Denitrification <br />(using labile carbon for electron transfer) reaction is: <br />6NO3 - + 5CH30H + H2CO3 —> 3N2 + 8H20+ 6HCO3 - <br />Sulfur i5 used for autotrophic (organism capable of synthesizing its own food from inorganic substances) <br />denitrification <br />