Effect of Hydraulic Retention Time and Sludge Retention Time on Membrane Bioreactor: Performance in Summer Season

The major reason of this study was to examine the effect of HRT and SRT on parameters such as chemical oxygen demand (COD), soluble COD (Sol.COD), biochemical oxygen demand (BOD), nitrogen (ammonia NH4, nitrate NO3) contents and phosphorus contents (Phosphate PO4), total suspended solids (TSS) and volatile suspended solids (VSS), soluble microbial products (SMP), proteins, carbohydrates, acetate and alkalinity (ALK) for hospital wastewater and residential quarter wastewater. The experiments have been carried out on laboratory-scale hollow fiber submerged membrane bioreactor (MBR) for summer season. The results have shown a high removal efficiency of COD, BOD and ammonia which ranged between 92.51 to 97.95 %, 93.10 to 97.63 % and 97.70 to 98.67 %, respectively. While, for TSS and VSS, the removals were found to reach almost 100 %. Comparatively, the phosphorus removal efficiency (54.50 to 57.95 %) was found inferior than other parameters.