面向城市污水高标准排放的多元耦合膜生物反应器运行性能研究  

Research on the Operation Performance of a Multi-Coupled Membrane Bioreactor for High-Standard Discharge of Municipal Sewage

作　　者：汪浏志 赵频 宋伟龙 王新华 WANG Liuzhi;ZHAO Pin;SONG Weilong;WANG Xinhua(School of Environment and Ecology,Jiangnan University,Wuxi 214122,China;Jiangsu Collaborative Innovation Center for Water Treatment Technology and Materials,Suzhou 215009,China)

机构地区：[1]江南大学环境与生态学院,江苏无锡214122 [2]江苏省水处理技术与材料协同创新中心,江苏苏州215009

出　　处：《水处理技术》2025年第2期128-133,共6页Technology of Water Treatment

基　　金：国家自然科学基金项目(51978312)。

摘　　要：为满足现有污水处理工艺升级改造的实际需求,开发了A/O-膜生物反应器(MBR)-正渗透(FO)组合工艺,并考察了污染物停留时间对工艺运行性能的影响。结果表明,在产水量不变的前提下,当微滤(MF)膜和FO膜的产水比例为2:1时,A/O-MBR-FO组合工艺MF膜和FO膜混合出水的化学需氧量(COD)和总氮(TN)浓度分别为9.98mg/L和6.88 mg/L,氨氮浓度低于检出限,均满足江苏省《城镇污水处理厂污染物排放标准》(DB32/4440-2022)的A标准,而总磷(TP)浓度为2.75 mg/L,仍需要后续化学混凝等工艺处理才能满足排放标准。在该产水比例下,A/O-MBR-FO组合工艺的MF通量运行稳定,未出现跨膜压差升高的情况,而FO膜通量衰减率仅为0.04 L/(m^(2)·h·d),膜污染较轻。FO膜污染类型主要是生物污染和无机污染的复合污染,其中无机污染物主要是钙盐和钠盐,而生物污染物主要是多糖和蛋白质。A/O-MBR-FO组合工艺有望为污水处理厂升级改造提供一个可行的技术选择。As water quality requirements in China become more stringent,various regions have introduced stricter emission standards.In response to the practical need for upgrading existing wastewater treatment processes,this study developed an A/O-MBR-FO combined process and examined the influence of pollutant retention time on performance.The results showed that at a constant water production rate,when the water production ratio of microfiltration(MF)to forward osmosis(FO)membranes is 2:1,the combined process yields an MF-FO mixed effluent with chemical oxygen demand(COD)and total nitrogen(TN)concentrations of 9.98 mg/L and 6.88 mg/L,respectively.Ammonia nitrogen is below the detection limit,meeting Class A standards of Jiangsu Province's"Pollutant Discharge Standards for Urban Wastewater Treatment Plants"(DB32/4440-2022).However,the total phosphorus(TP)level is 2.75 mg/L,necessitating subsequent chemical coagulation or additional treatment.Under this ratio,the combined process maintains stable MF flux without increased transmembrane pressure,while the FO membrane flux declines by only 0.04 LMH/d,indicating mild fouling.The dominant fouling types on the FO membrane are biological and inorganic,primarily involving calcium and sodium salts,as well as polysaccharides and proteins.Overall,the A/O-MBR-FO combined process appears to be a viable option for upgrading wastewater treatment plants.

关 键 词：膜生物反应器 正渗透 污染物停留时间 出水水质 膜污染 

分 类 号：TQ028.8[化学工程]