Abstract
MBR can produce consistently high quality effluent from municipal wastewater and a successful pilot study has already demonstrated advantages of the MBR process for reclaiming the domestic sewage in Singapore. However, a mixed sewage mostly from industrial sources (60% industrial waste and 40% domestic waste) poses a challenge for MBR application. The objective of this study was to determine the feasibility of reclaiming such a mixed sewage using a submerged MBR. A process of anoxic reaction – aerobic reaction – membrane filtration with submerged PVDF hollow fibre modules was used in the study. The MBR process was evaluated over 3 months. The pilot results indicated that HRT of 15 h in MBR might be required for treating the mixed sewage and a membrane flux of 17 LMH was sustainable in the MBR process. The MBR process demonstrated the improved product quality in terms of NH 4 and COD compared to the process of conventional activated sludge treatment-ultrafiltration. The study concluded the MBR process was capable of producing water suitable for industrial use from the mixed sewage.
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