A^2O工艺削减城市污水毒性的能力评估  

Evaluation of A^2O Process for Toxicity Reduction of Municipal Wastewater

作　　者：黄满红[1] 李咏梅[1] 顾国维[1] 

机构地区：[1]同济大学污染控制与资源化研究国家重点实验室,上海200092

出　　处：《中国给水排水》2006年第1期32-35,40,共5页China Water & Wastewater

基　　金：国家高技术研究发展计划(863)项目(2002AA649170)

摘　　要：依次改变A2O系统的水力停留时间、泥龄和混合液回流比,并使用发光菌毒性测试法对系统各反应单元的进、出水毒性进行了测试,从而首次从毒性削减角度对A2O工艺进行了评估,同时对部分工艺运行参数进行了优化选择。试验结果表明:A2O工艺对城市污水的毒性(以发光菌抑光率表示)有较好的削减能力;在温度为25℃、污泥回流比为100%的情况下,最佳的工艺运行参数为水力停留时间(HRT)=12.5 h、泥龄(SRT)=15 d、混合液回流比(r)=100%,此时NH3-N、SS、COD的去除率分别达到90.05%、77.17%、80.02%,毒性削减率也达到82.17%,其中厌氧池、缺氧池、好氧池、二沉池各段毒性削减量分别占毒性总削减量的16.29%、7.58%、52.01%、24.12%。A set of optimized operation parameters for A^2O process concerning on reducing the toxicity of municipal wastewater is presented. The toxicity of influents and effluents in the A^2O process was measured by luminescent bacteria toxicity test. Several operation parameters of the A^2O process （ HRT, SRT and the recycle ratio of mixed liquor ）were changed to investigate the effect on the toxicity reduction efficiency and pollutant removal efficiency. The results show that the A^2O process is advantageous for reducing the toxicity of municipal wastewater; under the conditions of HRT 12.5 h, SRT 15 d and reflux ratio 100%, the removal rate of NH3 -N, SS and COD is 90.05%, 77.17%, 80.02% respectively , and the toxicity reduction efficiency attains the level of 82.17%. The toxicity reduced in anaerobic tank, anoxic tank, aerobic tank and secondary clarifier is accounted for 16.29%, 7.58% , 52.01% and 24.12% of the total toxicity reduction.

关 键 词：污水处理 A^2O工艺 毒性削减 发光菌毒性测试 

分 类 号：X703.1[环境科学与工程—环境工程]