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

The effect of trace NO₂ on anaerobic ammonium oxidation, methanogenesis and denitrification in separate system was investigated by batch experiment. Trace NO₂ apparently enhanced the anaerobic ammonium oxidation, the function for NO₂ apparently to enhance ammonium oxidation was suggested using the Haldane based model. The parameters were estimated, where the half saturate coefficient of NO₂ was 2570 mg/L, inhibition coefficient of NO₂ was 0.0039 mg/L, the maximum enhanced rate coefficient was 48.79, the basic rate coefficient was 0.0188.The effect of NO₂ on methanogenesis and denitrification kinetics could be described using uncompetitive inhibition model. The maximum COD removal rate, half saturation constant of organic substance and NO₂ inhibition coefficient in methanogenesis were 0.149 mgCOD (mgVSS-h) -1, 396mgCOD/L and 0.231 mg NO₂ /L, respectively. The maximum nitrite removal rate, half saturation constant of NO-2-N and NO₂ inhibition coefficient in denitrification were 0.006865h-1, 0.1 mg NO-2-N /L and 1530 mg NO₂ /L, respectively. The effect of trace NO₂ integrating methanogenesis, denitrification and anaerobic ammonium oxidation was investigated by batch experiment. Also, the function for NO₂ apparently to enhance ammonium oxidation was suggested by the Haldane based model. The parameters were estimated, where the half saturate coefficient of NO₂ was 1.96 mg/L, inhibition coefficient of NO₂ was 0.0082 mg/L, the maximum enhanced rate coefficient was 3055, the basic rate coefficient was 0.0314. The effect of trace NO₂ on methanogenesis and denitrification kinetics could be described by uncompetitive inhibition model. The maximum COD removal rate, half saturation constant of organic substance and NO₂ inhibition coefficient in methanogenesis were 0.15mgCOD /(mgVSS-h), 395mgCOD /L and 0.62 3 mg NO₂ /L respectively. The maximum nitrite removal rate, half saturation constant of NO-2-N and NO₂ inhibition coefficient in denitrification were 0.00685 h-1, 0.214 mg NO-2-N /L and 22.4mg NO₂ /L respectively. The most of NO_x in the experiment was lossed.