Kinetic model for biological nitrogen removal using shortcut nitrification-denitrification process in sequencing batch reactor.
A kinetic model for shortcut nitrification-denitrification process with sequencing batch reactor (SBR) was developed. To test this model, the kinetic parameters of the model including maximum specific rates and half-maximum rate concentrations for shortcut nitrification and denitrification were estimated from the results obtained from a laboratory-scale SBR fed with a soybean curd processing wastewater (400-800 mg COD L(-1), 50-65 mg NH(4)(+)-N L(-1)) at 26 degrees C. In the nitrification step, two DO levels (0.5 and 3.5 mg L(-1)) were tested and the predicated nitrification rates under different NH(4)(+)-N concentrations using this model fit well with correlation coefficient R = 0.9902. In the denitrification step, the process of nitrite removal was close to a zero-order reaction if the concentration of electron donor was not so low (COD > 100 mg L(-1)), and concentrations of nitrite and organic matter (as COD) had limited effect on denitrification rate. The model can be used to predict nitrogen removal performance with different influent NH(4)(+)-N and COD concentrations and under various DO concentrations.
Gao
Dawen
D
State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, P.R. China. gaodw@hit.edu.cn
Peng
Yongzhen
Y
Wu
Wei-Min
WM
D000465:Algorithms; D019149:Bioreactors; D003198:Computer Simulation; D004583:Electrons; D052918:Environmental Restoration and Remediation; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008956:Models, Chemical; D015233:Models, Statistical; D009584:Nitrogen / Q000032:analysis / Q000737:chemistry / Q000302:isolation & purification*; D000644:Quaternary Ammonium Compounds / Q000737:chemistry; D013025:Glycine max; D014874:Water Pollutants, Chemical / Q000032:analysis; D018508:Water Purification
D000644:Quaternary Ammonium Compounds; D014874:Water Pollutants, Chemical; D009584:Nitrogen