一种改进型MABR系统的增氧性能评估  

Evaluating oxygenation performance of improved membrane aeration biofilm reactor

作　　者：孙秋慧[1] 邓恒 曹翠翠 马超[1] 郭祺忠 陈亮[1] SUN Qiuhui;DENG Heng;CAO Cuicui;MA Chao;GUO Qizhong;CHEN Liang(State Key Laboratory of Hydraulic Engineering Simulation and Safety,Tianjin University,Tianjin 300354;Tianjin Hydroking Sci.& Tec.Ltd.Co,Tianjin 300354)

机构地区：[1]天津大学水利工程仿真与安全国家重点实验室,天津300354 [2]天津海之凰科技有限公司,天津300354

出　　处：《水力发电学报》2019年第1期75-85,共11页Journal of Hydroelectric Engineering

基　　金：国家重点研发计划(2016YFC0401405);国家自然科学基金(NSFC 41772245)

摘　　要：治理城市黑臭水体的关键之一在于提高水体含氧量。膜曝气生物膜反应器(MABR)低压无泡特点常导致受处理水体溶解氧(DO)分布不均,从而降低MABR系统整体增氧性能并影响黑臭水体处理效果。针对该问题,对MABR系统进行改进,在MABR系统的中空纤维膜组件中设置可制造气泡的特殊中空纤维膜丝,改进后的MABR系统可形成气泡羽流,气泡羽流的搅拌特性可使MABR系统在保持高氧转移效率的同时提高其增氧均匀性,提高黑臭水体处理效果。通过模拟试验分析了改进后的MABR系统在模拟黑臭水体中的增氧效果及均匀性。结果表明:改进型MABR系统增氧效果随曝气压力的增加而增加,与未曝气(0 kPa)试验24 h内DO饱和率均值相比,10、20和30 kPa下,河水DO饱和率均值在水平试验中的增幅为-2.8%、17.7%和29.4%,在水深试验中的增幅为13.6%、6.6%和32.1%。同时,水平与水深试验中河水DO饱和率的分布随曝气压力的增大而更均匀,与0 kPa试验相比(水平与水深试验中河水DO饱和率的方差均值分别为1.7和13.5),10、20和30 kPa下,河水DO饱和率的方差均值在水平试验中为0.3、3.9和0.4,在水深试验中为9.8、18.4和3.4。改进后的MABR系统可实现对水体良好的增氧效果与均匀性,为解决我国城市河道黑臭水体难题提供了技术支撑。The key to managing the city’s black odorous water is to increase its oxygen content. Lowpressure and bubble-free characteristics of a membrane aeration biofilm reactor(MABR) often lead to an uneven distribution of dissolved oxygen(DO) over the treated water body, thereby reducing its overall performance of oxygenation and lowing its treatment effect. In this study, a MABR system is modified by installing special hollow fiber membrane filaments inside it so that the improved system can produce bubble plumes to stir the water and improve its oxygen transfer. An experiment is conducted to simulate this modified system and test its oxygenation effect and the uniformity of dissolved oxygen in treating artificial black odorous water. The results show that the bubble plume stirring can both raise the oxygenation efficiency and improve the uniformity of dissolved oxygen, thus improving the water treatment effect. And for the improved system, its oxygenation effect is increased with aeration pressure. Compared with the cases of no aeration(0 kPa), its average DO saturation rates of river water over 24 h under aeration pressures of 10, 20 and 30 kPa is increased by-2.8%, 17.7% and 29.4% respectively in our horizontal tests, and by 13.6%, 6.6% and 32.1% respectively in our depth tests. In these two types of tests, increasing aeration pressure leads to more uniform distributions of the saturation rate(its mean variances are 1.7 and 13.5 respectively). Under aeration pressures of 10, 20 and 30 kPa, the mean deviations in the saturation rate are 0.3, 3.9 and 0.4 respectively in the horizontal tests, and 9.8, 18.4 and 3.4 in the depth tests. Thus, the improved MABR system can achieve better oxygenation effect and better oxygen content uniformity, helping solve the urban river problem of black odorous water.

关 键 词：膜曝气生物膜反应器(MABR) 增氧效果 均匀性 DO饱和率 

分 类 号：X522[环境科学与工程—环境工程]