折流式A^(2)O-MBR工艺启动过程及影响因素研究  

Startup and Influencing Factors of a Baffled A^(2)O-MBR Process

作　　者：陈明月 刘丽红 温榛煌 石益广 王丽 刘钢 CHEN Mingyue;LIU Lihong;WEN Zhenhuang;SHI Yiguang;WANG Li;LIU Gang(China Construction Fourth Division Installation Engineering Co.LTD.,Guangzhou 510700,China;South China Institute of Environmental Science,Ministry of Ecology and Environment,Guangzhou,510655,China)

机构地区：[1]中建四局安装工程有限公司,510700 [2]生态环境部华南环境科学研究所,广东广州510655

出　　处：《水处理技术》2023年第4期120-123,153,共5页Technology of Water Treatment

基　　金：中建四局科技研发课题(CSCEC4B-2021-KTA-6);中央级公益性科研院所基本科研业务专项(PM-zx703-202104-130)。

摘　　要：针对MBR工艺的改进和优化,构建了小试规模的折流式A^(2)O-MBR工艺装置,将好氧池分为第一好氧池(O_(1))和第二好氧池(O_(2)),考察了溶解氧(DO)和水力停留时间(HRT)对处理性能的影响。进水COD、NH4+-N和PO_(4)^(3-)-P分别为400 mg/L、50 mg/L和5 mg/L。在HRT分别为24 h和12 h条件下,COD、NH4+-N和TN的去除效果保持稳定,平均去除率为90.2%、99.4%、84.8%,平均出水分别为38.1 mg/L、0.3 mg/L和7.6 mg/L。除磷性能受好氧区DO影响较大,将O_(1)池DO浓度从6 mg/L下降至3.5 mg/L,除磷效果明显改善,PO_(4)^(3-)-P去除率从45.0%提高至79.5%;在HRT缩短至12 h后,除磷效果保持稳定,出水平均浓度保持在1.0 mg/L。适当降低DO浓度、缩短HRT可避免聚磷菌体内PHB等内碳源过度消耗,有利于除磷效果的改善。Aiming at improving the performance of MBR process,a lab-scale baffled A^(2)O-MBR reactor was set up and the aerobic zone was divided into two parts,namingly O_(1) and O_(2).The influences of DO concentration and HRT on the nutrient removal performance of the A^(2)O-MBR reactor were investigated.The influent COD,NH4+-N and PO_(4)^(3-)-P were 400 mg/L,50 mg/L and 5 mg/L,respectively.When the HRT was reduced from 24 h to 12 h,the removal performance of COD,NH4+-N and TN were stable,with average removal efficiencies of 90.2%,99.4%and 84.8%,and average effluent concentrations of 38.1 mg/L,0.3 mg/L and 7.6 mg/L.The phosphorous removal performance was affected by the DO concentration greatly,and when the DO concentration of the O_(1) zone was reduced from 5.5 mg/L to 3.0 mg/L,the PO_(4)^(3-)-P removal efficiency rose from 45.0%to 79.5%.Thereafter,when the HRT was shortened to 12 h,the PO_(4)^(3-)-P removal efficiency kept stable and the effluent PO_(4)^(3-)-P concentration was kept at around 1.0 mg/L.Results showed that,a lower DO concentration and a shorter HRT are beneficial for the improvement of phosphorous removal performance,because the PHB storage in PAOs weren't consumed excessively.

关 键 词：生物脱氮除磷 膜生物反应器 城镇污水 水力停留时间 DO控制 

分 类 号：X703.1[环境科学与工程—环境工程]