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| Respirometric estimation of kinetics parameters for ammonium and nitrite oxidation under inhibition by N2H4 |
| XIAO Peng-ying1, ZHANG Di-jun2, CAI Qing3 |
1. School of Chemical Engineering, Chongqing University of Technology, Chongqing 400054, China;
2. State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400030, China;
3. Mining and Environmental Engineering, Chongqing Vocational Institute of Engineering, Chongqing 400037, China |
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Abstract The kinetic of CANON (completely autotrophic nitrogen removal over nitrite) process strengthened by trace hydrazine (N2H4) was investigated to provide fundamental data for further research and engineering application. Aerobic ammonium (NH4+) oxidation was divided into two steps, NH4+ oxidation to hydroxylamine step and hydroxylamine oxidation to nitrite step, and a startup function ae-bSNH2OH was added to the former step to describe the kinetic process of statup phase. Kinetics models for NH4+ and nitrite (NO2-) oxidation under N2H4 inhibition was established and calibrated with the oxygen uptake rate (OUR) obtained in the respirometric tests. The biomass yield coefficients of AOB for NH2OH oxidation to NO2-(YNH2OH) and NH4+ oxidation to NO2- (YNH4+) are estimated as (0.437±0.129)mgCOD/mgN and (0.324±0.0123)mgCOD/mgN, respectively. The biomass yield coefficient of NOB (YNO) is estimated as (0.222±0.0112)mgCOD/mgN. The half-saturation coefficient for N2H4 oxidation [KS,N2H4=(7.96±0.811)mgN/L], and kinitic inhibitor coefficients for NH4+ and NO2- oxidation by N2H4 [KI,HON=(7.88±0.783)mgN/L,KI,NO=(1.223±0.555)mgN/L, respectively] were first obtained by simulating the exogenous OUR profiles obtained in respirometric tests of nitrifying sludge at first time.
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Received: 19 January 2016
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