Determination of Biokinetic Coefficients for an Adsorption/Bio-Oxidation Process on Municipal Wastewater in Pilot-Scale Publisher



Hadei M¹ ; Aalipour M¹ ; Fatehizadeh A¹ ; Safavi HR² ; Ghasemian M³ ; Sahbaei AR³ ; Mousavi SM³ ; Zadeh MA³ ; Amin MM^{3, 4} Show Affiliations
Source: International Journal of Environmental Health Engineering Published:2015

Abstract

Aims: The present study was carried out to determine biokinetic coefficients of a pilot-scale adsorption-bio-oxidation process. Materials and Methods: The pilot plant was simulated North wastewater treatment plant, Isfahan, Iran. The pilot plant was operated 135 days under different mixed liquor suspended solids (MLSS) concentrations in aeration tank. In each phase, MLSS value was kept constant to reach a steady state condition. B-stage has a higher hydraulic retention time and SRT than A-stage. Also, in order to determine influence of biokinetic parameters on the effluent substrate concentration, a sensitivity analysis was performed. Results: The coefficients Y, Kd, KS, and μmax of A-stage were 1.34 mg VSS/mg sCOD, 0.17 d−1, 8.61 mg/L, and 2.78 d−1, respectively. Also, Y, Kd, KS, and μmax of B-stage were 0.74 mg VSS/mg sCOD, 0.12 d−1, 3.34 mg/L, and 71.94 d−1, respectively. Sensitivity analysis showed that in the A-stage, all coefficients are directly proportional to the effluent sCOD concentration. In the B-stage, Kd and KS are directly proportional, but μmax was inversely proportional to the effluent sCOD concentration. Conclusions: All coefficients were in the range of activated sludge coefficients that are mentioned in the literature, except μmax and KS of B-stage. However, KS value of B-stage was close to the desired range. Sensitivity analysis showed that μmax and KS have the most influence on effluent substrate concentration (sCOD). © 2015 International Journal of Environmental Health Engineering. All rights reserved.