动水中MABR-生态浮床组合装置净化效果试验研究

为探究生态浮床（EFB）、膜曝气生物膜（MABR）及其组合装置在动水中的净化效果，开展了三种净化装置在不同水动力条件下（2.5 m/h、10 m/h、20 m/h）对水体中NH4+-N、高锰酸盐指数（CODMn）、总磷（TP）和总氮（TN）等4类污染物净化效果的模拟试验研究。试验结果表明：膜曝气生物膜-生态浮床组合装置可显著提高净化效果，对4类污染物的去除率较河水自净试验可分别提高40% ~ 44%、17% ~ 34%、13% ~ 21%和14% ~ 30%；综合考虑4类污染物，组合装置在10 m/h的水动力条件下的净化效果最佳，且组合装置中MABR可起到一定缓冲作用，使水生植物的适用流速范围更广；在模拟试验所采用的水动力条件下，组合装置对4类污染物的净化呈现出不同规律，污染物浓度较高时，组合装置对NH4+-N的净化速率随流速的递增而递增，对CODMn、TP和TN的净化速率在10 m/h的水动力条件下达到最大；试验后期，污染物浓度较低时，组合装置无法正常发挥其高效的净化作用，对4类污染物的净化速率均偏小。

Study on purification efficiency of integrated device with membrane aeration biofilm reactor and ecological floating bed in flowing water

To explore the effects of ecological floating bed (EFB), a membrane aerated biofilm reactor (MABR), and an integrated device, an experimental study is conducted on their purification efficiency of four types of pollutants–NH4+-N, permanganate index (CODMn), total phosphorus (TP), and total nitrogen (TN) – in water flows with different velocities (2.5, 10 and 20 m/h). The results show that this MABR-EFB integrated device significantly improves purification effect, and its removal rates of the four pollutants are increased by 40% - 44%, 17% - 34%, 13% - 21% and 14% - 30% respectively compared with those of river water self-purification. A comprehensive consideration of all these pollutants indicates that the device performs best under the hydrodynamic condition at the flow velocity of 10m/h, and MABR buffering effect helps widen the flow velocity range applicable to aquatic plants. Under the hydrodynamic conditions tested in our experiment, the device behaves differently in removing different pollutants: in relatively high pollutant concentration, it purification rate increases with the increasing flow velocity for NH4+-N but reaches the maximum at 10 m/h for CODMn, TP and TN; in low concentration in the later stage of the experiment, it has a low purification rate for all the pollutants tested.