查看文章

A laboratory membrane bioreactor (MBR) using a submerged polyethylene hollow-fibre membrane module with a pore size of 0.4μm and a total surface area of 0.2m² was used for treating a raw water supply slightly polluted by domestic sewage. The feeding influent had a total organic carbon (TOC) level of 3–5mg/L and an ammonia nitrogen (NH₃-N) concentration of 3–4mg/L. The MBR ran continuously for more than 500 days, with a hydraulic retention time (HRT) as short as 1h or less. Sufficient organic degradation and complete nitrification were achieved in the MBR effluent, which normally had a TOC of less than 2mg/L and a NH₃-N of lower than 0.2mg/L. The process was also highly effective for eliminating conventional water impurities, as demonstrated by decreases in turbidity from 4.50±1.11 to 0.08±0.03 NTU, in total coliforms from 10⁵/mL to less than 5/mL and in UV₂₅₄ absorbance from 0.098±0.019 to 0 …