혐기-호기MBR시스템에 의한 도시하수고도처리 성능평가

초록

To enhance the existing anaerobic-anoxic-oxic activated sludge processes, a pilot-scale plant experiment was conducted, comprising anaerobic, selector, and aerobic membrane bioreactor (MBR) processes. The goal was to assess the system’s performancein treating domestic wastewater with night-soil characteristics (pH 6.8±0.5, BOD 148.6±43.7 mg/L, COD 94.6±26.4 mg/L, SS 157.3±51.2 mg/L, color 232.6±126.4 unit, T-N 39.223±13.257 mg/L). The anaerobic-aerobic MBR (ANOMBR) system had a capacity of 50m3/day with a hydraulic retention time (HRT) of 5.7 h. The MBR featured two plate-type membrane modules with an effective pore size of 0.4um. The effluent from the ANOMBR system met the criteria for reusing water, indicating its suitability for treating domestic wastewater with fluctuating levels. Increasing thereturned sludge ratio within 1Q achieved a similar level of mixed liquor suspended solid (MLSS) in the anoxic and selector processes, whereas it was two times higher in the aerobic MBR process. Regarding the location of the membrane modules, the lower membrane module achieved higher permeate flux and lower resistance than the upper membrane due to differences in water pressure and hydraulic shearing force. This hindered the deposition of sludge on the surface of the membrane module.

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