膜曝气生物反应器对受污染地表水的处理效果

以聚偏氟乙烯（PVDF）中空纤维膜为膜曝气生物反应器（MABR）的膜载体，探讨了MABR对模拟地表水的处理效果及其主要控制条件。采用序批式处理方式，重点考察了不同曝气强度（0.5、1和1.5 L·min-1）、不同压力（0.01、0.015和0.02 MPa）以及不同膜面积（0.3、0.5和0.6 m2）等受试条件下，MABR对TOC、总氮、氨氮、硝态氮、亚硝态氮等主要污染物的处理效果。结果表明：在受试范围内相同膜面积下压力越大，氨氮、总氮处理效果越好。不同压力对TOC的去除率影响不大，TOC去除率均在85%左右。压力对硝态氮含量影响效果显著，0.01 MPa下同时硝化反硝化作用最好。曝气强度为1 L·min-1 MABR处理效果优于0.5和1.5 L·min-1曝气强度，而膜面气流流速为6.7 cm·s-1时MABR处理效果最佳。

Treatment effect of membrane-aerated biofilm reactor (MABR) on polluted surface water

A membrane-aerated biofilm reactor (MABR) with a PVDF hollow-fiber membrane was investigated in batch experiments for use in treating synthetic polluted surface water. The key process parameters, including aeration intensities of 0.5, 1, and 1.5 L·min-1; aeration pressures of 0.01, 0.015, and 0.02 MPa; and membrane surface areas of 0.3, 0.5, and 0.6 m2, were investigated. The effect of the MABR on the removal rates of total nitrogen (TN), ammonia-N, nitrate-N, nitrite-N, and total organic carbon (TOC) was studied. The experimental results indicated that higher aeration pressure resulted in higher removal rates of ammonia-N and TN. The effect of aeration pressure on TOC was steady, and the TOC removal rate was stable at approximately 85%. The effect of aeration pressure on nitrate-N concentration was significant. The efficiencies of nitrification and denitrification were highest with an aeration pressure of 0.01 MPa. The effect of aeration intensity on the removal of pollutants by the MABR was highest at 1 L·min-1. Moreover, optimal conditions for the MABR process were reached at a membrane surface aeration velocity of 6.7 cm·s-1.