title: Factors affecting simultaneous nitrification and de-nitrification (SND) and its kinetics model in membrane bioreactor.
abstract: 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.
authors.affiliation: School of Environmental Science and Engineering, Shanghai Jiaotong University, Shanghai 200240, PR China. heshengbing@sina.com
authors.forename: Sheng-bing
authors.initials: SB
authors.lastname: He
authors.forename: Gang
authors.initials: G
authors.lastname: Xue
authors.forename: Bao-zhen
authors.initials: BZ
authors.lastname: Wang
mesh_terms: D019149:Bioreactors; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008567:Membranes, Artificial; D008962:Models, Theoretical; D009584:Nitrogen / Q000737:chemistry*
chemical_list: D008567:Membranes, Artificial; D009584:Nitrogen