一体式UASB—MBR反应器处理高浓有机废水

High-efficiency Integrated UASB-MBR for High Concentration Organic Wastewater Treatment

针对工业废水处理设备占地面积大、运行不稳定等缺点，开发了一体式UASB—MBR高效反应器，并采用其处理高浓度有机废水。结果表明，在稳定运行阶段，当进水COD浓度为3500—9500mg／L、HRT为7．4h时，对COD的平均去除率可达98．67％，出水COD达到了国家一级排放标准；当A段即UASB的容积负荷为23．81kgCOD／（m^3·d）时，颗粒污泥的最大比产甲炕速率为0．3168L／（gVSS·d），且反应器内挥发性脂肪酸的含量很低，是反应器运行的最佳负荷。冲击负荷试验的结果表明，无论是A段还是O段（MBR），均具有良好的耐冲击负荷能力，说明该反应器适用于水量和污染物浓度变化较大的工业废水处理。

The integrated UASB- MBR was developed to treat high concentration organic wastewater. This integrated process can save space and is highly efficient. A stable operation is set up with the concentration of influent COD being 3 500 -9 500 mg/L and HRT being 7.4 h. The results show that the reactor has excellent stabilization and the average removal rate of COD reaches 98.67%. The COD in the effluent meets the requirements of first grade of national wastewater discharge standard. When the volumetric loading rate in part A is 23.81 kgCOD/（ m3 · d）, there is high methanogenic activity in the granular sludge and the specific methanogenic activity （SMA） reaches 0.316 8 L/（ gVSS · d）. At the same time, the VFA concentration appears low in the reactor, therefore it is the optimal stage in the reactor. The shock test showes that both part A and part O have high flexibility with respect to fluctuating loading rates. Therefore, there is a likely prospect to treat large fluctuation industrial wastewater with the integrated UASB -MBR.