污泥双回流-AOA中试系统处理低C/N城镇污水的脱氮除磷性能  

Nitrogen and phosphorus removal performance on pilot-scale Sludge Double Recirculation-AOA system in treating low C/N municipal wastewater

作　　者：姚晓琰 李凌云 薛晓飞 高放 张建星 刘伟航 YAO Xiaoyan;LI Lingyun;XUE Xiaofei;GAO Fang;ZHANG Jianxing;LIU Weihang(Beijing Enterprises Water Group(China)Investment Limited,Beijing 100102,China)

机构地区：[1]北控水务(中国)投资有限公司,北京100102

出　　处：《环境工程学报》2023年第8期2524-2533,共10页Chinese Journal of Environmental Engineering

基　　金：国家重点研发计划资助项目(2021YFC3200605)。

摘　　要：为解决低C/N污水脱氮除磷难题,建立了基于污泥双回流-AOA新工艺的中试系统来处理低C/N城镇污水,处理规模为100 m^(-3)·d^(-1),考察了系统对COD和氮磷的处理效果,并对比了无第二污泥回流时的AOA工艺处理效果,分析了设置第二污泥回流的优势。结果表明,污泥双回流-AOA工艺污水处理效果显著优于无第二污泥回流时的AOA工艺,COD、NH_(4)^(+)-N、TN、TP平均去除率分别达88.8%,96.3%,85.8%,94.1%。内源反硝化批次实验表明,内源脱氮负荷与污泥浓度呈正相关。设置第二污泥回流,提高了缺氧区MLSS,缺氧段比反硝化速率和内碳源转化率均提升,缺氧区脱氮负荷提高,促进系统TN去除率提高;系统第二污泥回流比100%时,缺氧区脱氮负荷为0.086 kg N·(m^(-3)·d^(-1))。此外,设置第二污泥回流可有效避免系统在缺氧末和二沉池NH_(4)^(+)-N和TP质量浓度小幅回升。高通量测序结果表明,属于反硝化聚糖菌(DGAOs)的Candidatus_Competibacter为系统的优势菌属。本研究结果可为污泥双回流-AOA新工艺实现高效脱氮除磷提供参考。To address the challenging issue of nitrogen and phosphorus removal from low C/N sewage,a pilot system of the innovative Sludge Double Recirculation-AOA(SDR-AOA)process was established to treat low C/N municipal wastewater at a treatment scale of 100 m^(3)·d^(−1).The study investigated the removal effect of COD,nitrogen,and phosphorus,and compared the treatment effect of the AOA process without the second sludge recirculation to analyze the advantages of setting up the second sludge recirculation in the SDR-AOA process.The results indicated that the SDR-AOA process was significantly more effective than the AOA process without the second sludge recirculation,with average removal rates of COD,NH_(4)^(+)-N,TN,and TP at 88.8%,96.3%,85.8%,and 94.1%,respectively.The experiment on endogenous denitrification rate demonstrated a positive correlation between the endogenous denitrification rate and the sludge concentration.The second sludge recirculation improved the MLSS in the anoxic zone,resulting in an increase in both the specific denitrification rate and intracellular carbon storage efficiency,which increased the nitrogen removal load of the anoxic zone to promote TN removal of the system.When the ratio of the second sludge recirculation was 100%,the nitrogen removal load of the anoxic zone was 0.086 kgN·(m^(-3)·d^(-1)).Additionally,the second sludge recirculation effectively prevented the slight rise of NH_(4)^(+)-N and TP mass concentration at the end of the anoxic zone and secondary sedimentation tank.High-throughput sequencing revealed that Candidatus_Competibacter,belonging to denitrifying glycogen accumulating organisms(DGAOs),was the dominant genus in the system.The results of this study can provide a reference for efficient nitrogen and phosphorus removal by a novel SDR-AOA process.

关 键 词：污泥双回流-AOA工艺 低C/N 内源反硝化 脱氮除磷 反硝化除磷 

分 类 号：X703[环境科学与工程—环境工程]