A/DAT-IAT工艺处理城市污水的生态安全调控  

Ecological safety regulation of A/DAT-IAT process for municipal wastewater treatment

作　　者：朱爽[1] 华涛[1] 周启星[1,2] 吴琼[1] 

机构地区：[1]南开大学环境科学与工程学院教育部环境污染过程与基准重点实验室,天津300071 [2]中国科学院沈阳应用生态研究所陆地生态过程重点实验室,沈阳110016

出　　处：《应用生态学报》2009年第5期1209-1213,共5页Chinese Journal of Applied Ecology

基　　金：高等学校科技创新工程重大项目培育资金项目(707011);国家自然科学基金项目(20777040);中国科学院陆地生态过程重点实验室开放基金资助.

摘　　要：以A/DAT-IAT工艺出水的常规指标和生态毒性指标为考察对象,对A/DAT-IAT工艺处理城市污水的运行周期(T)、外回流比(R1)、内回流比(R2)和混合液污泥浓度(MLSS)4个控制参数进行了3个水平的正交试验.结果表明:混合液污泥浓度(MLSS)是4个控制参数中对考察对象影响最大的因素;去除常规指标的最优运行条件为运行周期3 h,外回流比20%,内回流比150%,MLSS 5000 mg.L-1;去除生态毒性指标的最优运行条件为运行周期3h,外回流比20%,内回流比150%,MLSS 3000 mg.L-1.分析表明,造成去除两类指标的最优运行条件不同的主要原因可能是污水中存在具有一定生态毒性的难生物降解有机物和经水解酸化后毒性增强的有机物.本试验研究为该工艺今后的生态安全调控改进提供了参考方向.建议投加絮凝剂,同时适当选择运行控制参数,以共同提高对常规指标和生态毒性指标的去除效果.Four controlling parameters of A/DAT-IAT process for municipal wastewater treatment, i. e. , operation period （ T）, external recycled rate （R1）, internal recycled rate （R2 ）, and mixed liquid suspended solid concentration （ MLSS ）, were studied by orthogonal experiments, and the regular and ecotoxicological indicators of the effluents were examined. The results showed that the optimum conditions of regular indicators removal were T = 3 h, R1 = 20% ,R2 = 150% , and MLSS = 5000 mg · L^-1, and the optimum conditions of ecotoxicological indicators removal were T = 3 h, R1 =20% ,R2 = 150% , and MISS =3000mg · L^-1 The reason which caused the difference of the two optimum conditions might be that there were some non-biodegradable organic matters having certain ecological toxic effects and some organic matters whose ecological toxicity increased after hydrolysis and acidification. Adding floeculants and properly choosing controlling parameters were suggested to improve the regular and ecotoxieological indicators of the effluent.

关 键 词：A/DAT-IAT工艺 生态毒性 正交试验 根伸长 常规指标 

分 类 号：X703.1[环境科学与工程—环境工程] X820.4