A^(2)/O-BCO前置反硝化除磷中试的启动与优化运行  

Starting and optimizing operation of A^(2)/O-BCO pre-denitrifying phosphorus removal process at pilot scale

作　　者：周庆国 苏健 陈东旭 彭永臻[3] ZHOU Qingguo;SU Jian;CHEN Dongxu;PENG Yongzhen(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031;Research Center for Water Treatment Technology,CRCC Development Group Co.,Ltd.,Beijing 100043;National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology,Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering,Beijing University of Technology,Beijing 100124)

机构地区：[1]西南交通大学土木工程学院,成都610031 [2]中铁建发展集团有限公司水处理技术研究中心,北京100043 [3]北京工业大学城镇污水深度处理与资源化利用国家工程实验室,北京市水质科学与水环境恢复工程重点实验室,北京100124

出　　处：《环境科学学报》2024年第3期13-22,共10页Acta Scientiae Circumstantiae

基　　金：中铁建发展集团有限公司科技研发计划项目。

摘　　要：为探究低C/N城镇污水处理在无外加碳源的情况下实现深度脱氮除磷的效能,试验以实际城镇生活污水为处理对象,搭建了日处理规模为100 m^(3)·d^(-1)的A^(2)/O-BCO前置反硝化除磷中试,并从中试快速启动、工况调整与优化、微生物群落分析等角度进行研究.结果表明,通过先在A^(2)/O单元与BCO单元中分别富集聚磷菌与硝化菌,再增加硝化液回流以富集反硝化除磷菌(DPAOs)的方式,可实现A^(2)/O-BCO前置反硝化除磷中试的快速启动.A^(2)/O单元厌氧/缺氧/好氧容积比调整为3∶5∶1,硝化液回流比设定为250%时,缺氧段对磷去除率的平均值达到95%,平均出水PO_(4)^(3-)-P浓度小于0.2 mg·L^(-1),出水TN小于11 mg·L^(-1).通过分子生物学分析发现,除磷菌(PAOs)与硝化菌丰度显著提高,Candidatus Accumulibacter的相对丰度从原始种泥的2%增加到14%,已被证实具有反硝化聚磷功能的Dechloromonas的相对丰度从原始种泥的2%增加到7%,BCO单元中的生物膜上,Nitrosomonas的相对丰度为5.91%,Nitrospira的相对丰度为7.58%.In order to achieve advanced nitrogen and phosphorus removal in low C/N ratio urban sewage without the addition of external carbon source,this study focused on the treatment of actual urban domestic wastewater,and constructed a pilot-scale A^(2)/O-BCO system(pre-denitrification phosphorus removal)with a daily treatment capacity of 100 m3⸱d-1.The research encompassed aspects including rapid startup of the pilot system,operational adjustments and optimization,and analysis of the microbial community.The rapid startup of the pilot scale A^(2)/O-BCO system was achieved by first enriching phosphorus-accumulating organisms(PAOs)in the A^(2)/O unit and nitrifying bacteria in the BCO unit separately,then increasing the return flow of nitrified effluent to enrich denitrifying phosphorus-accumulating organisms(DPAOs).In the A^(2)/O unit,the anaerobic/anoxic/aerobic volume ratio was adjusted to 3∶5∶1,and when the return flow ratio of nitrified effluent was set at 250%,the average phosphorus removal efficiency in the anoxic stage reached 95%,and the average effluent PO_(4)^(3-)-P and TN(total nitrogen)concentrations were less than 0.2 and 11 mg·L^(-1),respectively.Molecular biology analysis revealed a significant increase in the abundance of PAOs and nitrifying bacteria.The relative abundance of Candidatus Accumulibacter increased from 2%in the seed sludge to 14%.And Dechloromonas,a confirmed organism with denitrifying and phosphorus-accumulating functions,increased from 2%to 7%.In the biofilm of the BCO unit,Nitrosomonas accounted for 5.91%of the microbial community,and Nitrospira accounted for 7.58%.

关 键 词：低C/N城镇污水 前置反硝化除磷 中试规模 无外加碳源 快速启动 

分 类 号：X703[环境科学与工程—环境工程]