A study on the application of membrane bio-reactor for municipal wastewater treatment
Abstract
The study aims to investigate an appropriate wastewater treatment process to treat domestic wastewater in Hanoi city which contains low concentration of COD (120-200 mg/l) but high in nitrogen content (20-40 mg/l). An AO-MBR (Anoxic-Oxic membrane bioreactor) was operated at a flux of 5-10 L/h over a period of 150 days. The reactor was operated at different sludge recirculation rates. The MBR maintained relatively constant transmembrane pressure. During 150 days of reactor operation, treated water quality have COD of around 15-20 mg/l, NH4-N of less than 1 mg/l, NO3-N of less than 5 mg/l. The system shows good and stable removal efficiency of organic matter and nitrogen without adding an external carbon sources, alkalinity and coagulants. The research results from this study indicated that the proposed process configuration has potential to treat the low strength wastewater in Hanoi.
Keywords: MBR, domestic waste water, Hanoi, nitrogen removal
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