Factors affecting simultaneous nitrification and de-nitrification (SND) and its kinetics model in membrane bioreactor.
Experiments have been carried out to investigate the effect of biological factors such as dissolved oxygen (DO), food/microorganism (F/M) ratio, carbon/nitrogen (C/N) ratio and pH on performance of SND in membrane bioreactor (MBR). It was found that a low DO was advantageous to SND on condition that nitrification was not inhibited, while F/M ratio and C/N ratio have reverse effects on SND, and pH should also be controlled in a suitable range. Based on the conventional activated sludge model, a deduction was conducted to illustrate that SND could take place from the theoretical aspect, and it was proved that high organics was effective in improving SND. In addition, a kinetic model for SND was constituted on the basis of batch test result, and the simulation nitrate saturation coefficient K(NO)(3) was much higher than that in a single-sludge wastewater treatment system.
He
Sheng-bing
SB
School of Environmental Science and Engineering, Shanghai Jiaotong University, Shanghai 200240, PR China. heshengbing@sina.com
Xue
Gang
G
Wang
Bao-zhen
BZ
D019149:Bioreactors; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008567:Membranes, Artificial; D008962:Models, Theoretical; D009584:Nitrogen / Q000737:chemistry*
D008567:Membranes, Artificial; D009584:Nitrogen