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Journal of Environmental Biology

pISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP

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        Abstract - Issue Jul 2014, 35 (4)                                                                                                             Back

nstantaneous and historical temperature effects on a-pinene

Effect of substrates and free ammonia on kinetic characteristics of nitritation and nitratation by entrapped nitrifiers


Zhirong Li1*, Zhi Zhang2 and Zhenjia Zhang1

1School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai-200 240, China

2School of Nuclear Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200 240, China

*Corresponding Author E-mail:





Publication Data

Paper received:

15 January 2014


Revised received:

13 March 2014



14 March 2014





In the present study, nitrifying bacteria entrapped in waterborne polyurethane gel was used to investigate the kinetic characteristics of nitritation and nitratation in relation to achieve shortcut nitrification. The nitrite accumulation rate was over 80% during the acclimation period. The following kinetic parameters were experimentally obtained: maximum nitrification rate (vmax), half-saturation coefficient (KS and KO), and inhibition coefficient (KIH). The bacterial populations were also determined by fluorescence in situ hybridization. 73.5% proportion of ammonia oxidizing bacteria (AOB) resulted in a significantly higher ammonia oxidizing rate than nitrite oxidizing rate, which is in agreement with higher Vmax of nitritation (608.5 mgNl-1-pellet h-1) over nitratation (66.3 mgN l-1-pellet h-1). 


Key words


Entrapped nitrifying bacteria, Kinetics, Nitratation, Nitritation, Shortcut nitrifiication


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