Simultaneous removal of sulfide, nitrate and acetate: Kinetic modeling.
Biological removal of sulfide, nitrate and chemical oxygen demand (COD) simultaneously from industrial wastewaters to elementary sulfur (S(0)), N(2), and CO(2), or named the denitrifying sulfide (DSR) process, is a cost effective and environmentally friendly treatment process for high strength sulfide and nitrate laden organic wastewater. Kinetic model for the DSR process was established for the first time on the basis of Activated Sludge Model No. 1 (ASM1). The DSR experiments were conducted at influent sulfide concentrations of 200-800 mg/L, whose results calibrate the model parameters. The model correlates well with the DSR process dynamics. By introducing the switch function and the inhibition function, the competition between autotrophic and heterotrophic denitrifiers is quantitatively described and the degree of inhibition of sulfide on heterotrophic denitrifiers is realized. The model output indicates that the DSR reactor can work well at 0.5<C/S<3.0 with influent sulfide concentration of 400-1000 mg/L. At >1000 mg/L influent sulfide, however, the DSR system will break down.
Wang
Aijie
A
State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China. waj0578@hit.edu.cn
Liu
Chunshuang
C
Ren
Nanqi
N
Han
Hongjun
H
Lee
Duujong
D
D000085:Acetates / Q000302:isolation & purification*; D002138:Calibration; D002852:Chromatography, Ion Exchange; D007220:Industrial Waste; D007700:Kinetics; D015233:Models, Statistical; D009566:Nitrates / Q000302:isolation & purification*; D010084:Oxidation-Reduction; D013440:Sulfides / Q000302:isolation & purification*; D014865:Waste Disposal, Fluid
D000085:Acetates; D007220:Industrial Waste; D009566:Nitrates; D013440:Sulfides