Predicting Accumulation of Intermediate Compounds in Nitrification and Autotrophic Denitrification Processes: A Chemical Approach

Table 3

Half reactions involved during ammonia oxidation and autotrophic denitrification written as reduction processes ( was calculated considering [Ox]/[Red]=1 [15]).

Process	Half reaction	(V)
Partial nitrification
	1/4 O2 + H^++ e^- → 1/2 H2O
	1/8 N2O + 5/4 H^++ e^- → 1/8 H2O + 1/4
	1/6 + 4/3 H^+ + e^- → 1/6 + 1/3 H2O
Autotrophic denitrification
	1/5 + 6/5 H^+ + e^- → 1/10 N2 + 3/5 H2O
	1/3 + 4/3 H^+ + e^- → 1/6 N2 + 2/3 H2O
	1/8 + 9/8 H^+ + e^- → 1/8 HS^- + 1/2 H2O
	1/2 S + 1/2 H^+ + e^- → 1/2 HS^-

F is the Faraday constant (96,500 C/mol)