纳米颗粒短期暴露对MBR中微生物特性及膜污染的影响  

EFFECTS OF SHORT-TERM PRESENCE OF NANOPARTICLES ON MBR SLUDGE PROPERTIES AND MEMBRANE FOULING

作　　者：黄菲[1] 王志伟[1] 梅晓洁[1] 吴志超[1] 

机构地区：[1]同济大学环境科学与工程学院污染控制与资源化研究国家重点实验室,上海200092

出　　处：《水处理技术》2013年第8期14-18,26,共6页Technology of Water Treatment

基　　金：国家高技术研究发展(863)计划(2012AA063403);上海市科委项目(12230707000)

摘　　要：研究了MBR污泥在纳米氧化锌(ZnO NPs)的短期暴露下,单一生物过程对不同ZnO NPs投加量的敏感性试验,并考察了ZnO NPs在MBR生物处理过程对碳、氮去除的影响。结果显示,单一生物过程对ZnO NPs毒性的敏感程度依次为硝化过程>反硝化过程>有机物降解过程,生物抑制平衡点分别为25.5、42.5、68 mg/L。同时,ZnO NPs在污水生物处理过程对氮的去除影响也较大;80%以上的ZnO NPs吸附在微生物表面或进入细胞内部,从而抑制微生物的生长与繁殖。高浓度的ZnO NPs可导致细菌死亡,同时释放胞内聚合物;导致溶解性微生物产物增加,在一定程度上存在加剧膜污染的风险。This work explored the bacterial performance of a short-term effect of ZnO nanoparticles（ZnO NPs） on MBR sludge,including sensitivity tests of different dosages of ZnO NPs on single biological processes and the effect of ZnO NPs on carbon and nitrogen removal in MBR biological treatment process.The results showed that the process of nitrification was more sensitive than that denitrification,and the denitrification process was more sensitive than that organism degradation process.What is more,the minimum dosage of ZnO NPs for the maximum extent inhibition was 25.5,42.5 and 68 mg/L for each one.While the nitrogen removal in the complex biological process was seriously decreased under the impact of ZnO NPs.More than 80% of ZnO NPs was absorbed on the surface of bacteria or got into the cells,leading to inhibiting microbial growth and reproduction.Besides,high level of ZnO NPs could result in bacterial death and intracellular polymer releasing,thus the concentration of soluble microbial products would be increased,which may cause potential membrane fouling risk.

关 键 词：纳米氧化锌 毒性 膜污染 膜生物反应器 污水处理 

分 类 号：TQ028.8[化学工程] X703.1[环境科学与工程—环境工程]