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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: lizr0210@gmail.com

 

 

 

 

Publication Data

Paper received:

15 January 2014

 

Revised received:

13 March 2014

 

Accepted:

14 March 2014

 

 

Abstract

 

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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