Kinetic Evaluation of Simultaneous CNP Removal in an up-Flow Aerobic/Anoxic Sludge Fixed Film (UAASFF) Bioreactor

The kinetics of simultaneous removal of carbon, nitrogen and phosphorus from a syntheticwastewater in an innovative up-flow aerobic/anoxic sludge fixed film (UAASFF) bioreactor was investigated.The kinetic analysis was performed using the experimental data obtained in an earlier study where the UAASFFbioreactor was examined under different operating conditions by changing three independent variables, HRT,COD:N:P ratio and aeration time. In the analysis, different kinetic models (Monod, first-order, second-order andStover-Kincannon models) were evaluated. The maximum removal efficiency of COD, total nitrogen (TN) andphosphorus (TP) were obtained to be 95.42, 79 and 79.1 %, respectively. All the models examined, gave highcorrelation coefficients for carbon, nitrogen and phosphorus removal. Biokinetic coefficients were determinedas Y= 0.417-0.496 g VSS/g COD, kd= 0.027-0.053 d , μmax =1.36 g VSS /g VSS.d, KB=37.96 g/l.d, Umax =38.46 g/l.d,1KB(N)=0.271-7.2 g/l.d 6, Umax(N) =0.33-5.4 g/l.d, KB (P)=0.09-0.89 g/l.d, Umax (P)=0.07-0.42 g/l.d.

Keywords:

Simultaneous nutrients removal kinetics , UAASFF bioreactor , Monod , Grau second-order model , Stover-Kincannon model