Aerobic Activated Sludge Case Study

Posttreatment of anaerobically treated DWW by aerobic activated sludge using SBR and membrane UF was investigated. The aim of this study was to reduce the organic loading (COD and BOD), nutrients (TKN, NO2, NO3 and TP) and total suspended solids (TSS) of anaerobically treated DWW effluent first by the activated sludge system using SBR and further treated by ceramic tubular membrane UF separately to investigate the possibility of the reusing the effluent for different purposes depending on the quality of the water produced. SBR works under cycle operation time of 24 h with an operation strategy of Filling (0 h), Anoxic react (2 h), aerobic react (19 h), settling (1 h) and decanting (0.5 h) in sequence order. Due to the variation of influent characteristics, SBR was operated at constant HRT of 4 d and OLR varies from 0.537 to 0.655 kg COD/m3.d. …show more content…
DO and Temp, were maintained b/n 0 to 8.1 mg/l and 16.7 – 17.8 ℃ respectively, during the complete cycle of the SBR operation. The system reached the steady state condition in about 20 days and gives more or less the same effluent quality. The final average COD, TKN, NH4-N, TP, PO4, and TSS of the effluent SBR were around 132 mg/l, 12.2 mg/l, 1.25 mg/l, 3.76 mg/l, 8.11 mg/l, and 30 mg/l with percentage removal efficiency of 95%, 88%, 98%, 89%, 91%, and 93% respectively. Residual NO3-N, NO2, and PH were around 6.22 mg/l, 0.113 mg/l and 8-8.25 respectively. Color and Oder also reduced. The results obtained was met the criteria to discharge according to the Polish law but does not met the criteria for reuse.