Evaluating the performance of extended aeration processin treatment of hospital wastewater and determining its kinetic coefficients- Case study: Wastewater Treatment Plant of Quds Hospital in Sanandaj

The most effective issues in biolog ical processes of wastewater treatment are appropriate selection of bio-kinetics issues. Therefore, the goal of this study is to review the operation, to determine the kinetics parameters and to model the biological process of the activated sludge unit of Qods hospitals wastewater treatment plant in Sanandaj, Iran.
This research is a descriptive sectional one which is conducted in the laboratory of Sanandaj wastewater treatment plant during 3 months in the 2011.As a result, a total of 100 samples were taken from raw wastewater, pond aeration, secondary effluent sludge and returned sludge. In each sample, COD, MLSS, TSS, VSS, discharge of raw sewage, F/M (on a daily basis), and BOD5 (two times a week) were measured.
Findings: The results from this study showed that the mean BOD5, COD, TSS in the secondary effluent were 39±11.9, 102±23.6 and 53±30 mg/l, respectively, and the mean of kinetics parameters of K, KS, Y, Kd, and µmax were 2.39±0.14, 36.7±5.97, 0.188±0.028, 0.04±0.01 and 0.39±0.017 respectively.
Considering the intended goal (determination of kinetic coefficients) the overall efficiency of the activated sludge system was obtained to beinappropriate.