中试规模AAO-曝气生物滤池双污泥系统的启动运行  

Start-up of pilot-scale AAO-BAF two-sludge system

作　　者：张勇[1] 王淑莹[1] 赵伟华[1] 孙事昊 彭永臻[1] 曾薇[1] 

机构地区：[1]北京工业大学北京市水质科学与水环境恢复工程重点实验室,北京市污水脱氮除磷处理与过程控制工程技术研究中心,北京100124

出　　处：《化工学报》2015年第10期4228-4235,共8页CIESC Journal

基　　金：国家高技术研究发展计划项目(2012AA063406);北京市教委科技创新平台项目~~

摘　　要：AAO-曝气生物滤池（BAF）是污泥龄差距较大的双污泥系统,可在低C/N条件下实现氮、磷的同步去除。本试验以低碳氮比的城市污水为处理对象,研究了处理量为40~100 m3·d-1的大型中试级别的AAO-BAF脱氮除磷工艺的启动运行。通过先使AAO和BAF独立运行以分别培养驯化聚磷菌活性污泥和硝化细菌生物膜,待分别观察到AAO出水TP及BAF出水NH4^＋-N浓度稳定后,再将两部分连通运行的策略,使得在第58天时系统出水COD、NH4^＋-N、TN、TP、浊度、SS分别小于50 mg·L^-1、5 mg·L^-1、15 mg·L^-1、0.5 mg·L^-1、5NTU、10 mg·L^-1,表明该中试系统已成功启动。与小试研究比较发现,分开运行更有利于聚磷菌的培养驯化;BAF中采用自然挂膜法较接种污泥法更方便,但增加了填料挂膜的时间。根据微生物群落多样性分析,发现AAO中的硝化细菌丰度少于3%,而BAF生物膜上的硝化细菌的丰度占到12%以上。本试验可为该工艺的实际工程应用提供一定参考。Anaerobic/anoxic/oxic （AAO）-biological aerated filter （BAF） is a two-sludge system with different SRT, which can remove nitrogen and phosphorus simultaneously in the low C/N condition. The startup of a pilot-scaled AAO-BAF system with capacity of 40—100 m3＆#183;d？1 used for treating real domestic sewage was studied in this experiment. The AAO and BAF run independently in order to cultivate and acclimate the phosphorus accumulating organisms （PAOs） and nitrifying bacterial biofilms, respectively. When the TP concentration of AAO effluent andNH4^＋-N concentration of BAF effluent were found keeping stable, the two parts were combined. With this operation strategy, the effluent concentration of COD,NH4^＋-N, TN, TP, NTU and SS was lower than 50 mg·L^-1, 5 mg·L^-1, 15 mg·L^-1, 0.5 mg·L^-1, 5 NTU and 10 mg·L^-1 in the 58th day, respectively, indicating the successful setup of the pilot-scaled process. Comparing with the lab-scale study, the separate running had more advantage in cultivating PAOs. The formation of natural biofilm in BAF was more convenient than the method of inoculated sludge, but needed longer time. According to the analysis of microbial community diversity, the abundance of nitrobacteria was less than 3% in the AAO system, however, it was higher than 12% on the biofilm in BAF. This experiment can provide a reference for practical engineering application of the process.

关 键 词：双污泥系统 生物膜 反硝化除磷 低C/N 污水 降解 

分 类 号：X703.1[环境科学与工程—环境工程]