摘要
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。
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 10 m/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.
作者
苑希民
张紫畅
马超
徐奎
孙亚楠
YUAN Ximin;ZHANG Zichang;MA Chao;XU Kui;SUN Yanan(State Key Laboratory of Hydraulic Engineering Simulation and Safety,Tianjin University,Tianjin 300354;Xincun Street Sub-district Office,Binhai New District,Tianjin 300451)
出处
《水力发电学报》
EI
CSCD
北大核心
2020年第6期62-71,共10页
Journal of Hydroelectric Engineering
基金
水体污染控制与治理科技重大专项(2017ZX07106-004)
关键词
组合装置
净化效果
净化速率
生态浮床
膜曝气生物膜反应器
integrated purification device
purification efficiency
purification rate
ecological floating bed
membrane aerated biofilm reactor
