Effect of Trace NO2 and Kinetic Characteristics for Anaerobic Ammonium Oxidation, Methanogenesis, Denitrification and Their Integration of Granular Sludge

The effect of trace NO
₂
on anaerobic ammonium oxidation, methanogenesis and denitrification in separate system was investigated by batch experiment. Trace NO
₂
apparently enhanced the anaerobic ammonium oxidation, the function for NO
₂
apparently to enhance ammonium oxidation was suggested using the Haldane based model. The parameters were estimated, where the half saturate coefficient of NO
₂
was 2570 mg/L, inhibition coefficient of NO
₂
was 0.0039 mg/L, the maximum enhanced rate coefficient was 48.79, the basic rate coefficient was 0.0188.The effect of NO
₂
on methanogenesis and denitrification kinetics could be described using uncompetitive inhibition model. The maximum COD removal rate, half saturation constant of organic substance and NO
₂
inhibition coefficient in methanogenesis were 0.149 mgCOD (mgVSS-h) -1, 396mgCOD/L and 0.231 mg NO
₂
/L, respectively. The maximum nitrite removal rate, half saturation constant of NO-2-N and NO
₂
inhibition coefficient in denitrification were 0.006865h-1, 0.1 mg NO-2-N /L and 1530 mg NO
₂
/L, respectively. The effect of trace NO
₂
integrating methanogenesis, denitrification and anaerobic ammonium oxidation was investigated by batch experiment. Also, the function for NO
₂
apparently to enhance ammonium oxidation was suggested by the Haldane based model. The parameters were estimated, where the half saturate coefficient of NO
₂
was 1.96 mg/L, inhibition coefficient of NO
₂
was 0.0082 mg/L, the maximum enhanced rate coefficient was 3055, the basic rate coefficient was 0.0314. The effect of trace NO
₂
on methanogenesis and denitrification kinetics could be described by uncompetitive inhibition model. The maximum COD removal rate, half saturation constant of organic substance and NO
₂
inhibition coefficient in methanogenesis were 0.15mgCOD /(mgVSS-h), 395mgCOD /L and 0.623 mg NO
₂
/L respectively. The maximum nitrite removal rate, half saturation constant of NO-2-N and NO
₂
inhibition coefficient in denitrification were 0.00685 h-1, 0.214 mg NO-2-N /L and 22.4mg NO
₂
/L respectively. The most of NO
_x
in the experiment was lossed.