Kinetic Model for Biological Nitrogen Removal Using Shortcut Nitrification-Denitrification Process in Sequencing Batch Reactor

摘要

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 COO L~(-1), 50-65 mg NH_4~+-N L~(-1)) at 26 ℃. 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 = 0.3902. 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.