11种邻苯二甲酸酯在好氧污水处理系统中的归趋

发布时间：2018-10-18 20:52

【摘要】：邻苯二甲酸酯具有内分泌干扰效应,已对环境生物带来了较大的风险.研究了11种邻苯二甲酸酯的好氧生物降解性,及在活性污泥中的去除特性.快速生物降解性测试结果表明邻苯二甲酸二甲酯(dimethyl phthalate,DMP)、邻苯二甲酸二甲氧乙酯(dimethoxyethyl phthalate,BMEP)、邻苯二甲酸二乙酯(diethyl phthalate,DEP)、邻苯二甲酸二丁酯(dibutyl phthalate,DBP)、邻苯二甲酸二异丁酯(diisobutyl phthalate,DIBP)、邻苯二甲酸二戊酯(dinamyl phthalate,DNPP)、邻苯二甲酸二己酯(di-n-hexyl phthalate,DNHP)以及邻苯二甲酸-二(2-乙基)己酯[bis(2-ethylhexyl)phthalate,DEHP]具有快速生物降解性,邻苯二甲酸二壬酯(dinonyl phthalate,DNP)及邻苯二甲酸二环己酯(dicyclohexyl phthalate,DHP)28d生物降解但未通过10 d观察期,邻苯二甲酸二苯酯(diphenyl phthalate,DPP)28 d生物降解率只有43.5%.好氧污泥降解动力学实验中,11种邻苯二甲酸酯(phthalic acid esters,PAEs)降解随时间变化呈典型的一级动力学规律,相关系数r20.96,降解速率常数为0.021~1.11h-1,降解半衰期在0.625~32.7 h之间.在室内好氧污泥模拟实验中,当水力停留时间为12 h时候,DNPP生物去除率为55%~70%,其余10种PAEs去除率大于80%,当水力停留时间为24 h时,所有PAEs去除率都达到90%以上.使用GC/MS分析了PAEs在好氧生化污水处理厂中的暴露水平,结果表明,DMP、DEP、DIBP、DBP以及DEHP在二级出水浓度分别为ND~44.0、ND~12.0、60.4~594、88.0~823和130~728 ng·L~(-1),PAEs在不同STP中的去除率结果差异较大,可能与STP运行工艺和运营水平有关.STP模型预测结果表明,PAEs在STP中的去除过程主要为生物降解,DPP、DNP和DEHP由于较高的lg Koc,可一定程度地被污泥吸附去除.
[Abstract]:Phthalate has endocrine disrupting effect, which has brought great risk to environmental organisms. The aerobic biodegradability of 11 phthalates and their removal characteristics in activated sludge were studied. Rapid biodegradability test showed that dimethyl phthalate (dimethyl phthalate,DMP), dimethoxyphthalate (dimethoxyethyl phthalate,BMEP), diethyl phthalate (diethyl phthalate,DEP), dibutyl phthalate (dibutyl phthalate,DBP), diisobutyl phthalate (diisobutyl phthalate,DIBP), phthalic acid (Phthalic acid) Diamyl phthalate (dinamyl phthalate,DNPP), dihexyl phthalate (di-n-hexyl phthalate,DNHP) and diethylhexyl phthalate [bis (2-ethylhexyl) phthalate,DEHP] have rapid biodegradability. The biodegradation rate of dinonyl phthalate (dinonyl phthalate,DNP) and dicyclohexyl phthalate (dicyclohexyl phthalate,DHP) was 43.5% in 28 days without passing the observation period of 10 days. In the aerobic sludge degradation kinetics experiment, the degradation of 11 phthalates (phthalic acid esters,PAEs showed a typical first-order kinetic law with a correlation coefficient of r 20.96, a degradation rate constant of 0.021 ~ 1.11h-1 and a degradation half-life of 0.625 ~ 32.7 h. In the indoor aerobic sludge simulation experiment, when the HRT was 12 h, the removal rate of DNPP was 55%, the removal rate of the other 10 kinds of PAEs was more than 80%, and when the HRT was 24 h, all PAEs removal rates were above 90%. The exposure level of PAEs in aerobic and biochemical wastewater treatment plant was analyzed by GC/MS. The results showed that the removal rates of DMP,DEP,DIBP,DBP and DEHP in secondary effluent were ND~44.0,ND~12.0,60.4~594,88.0~823 and 130 ~ 728 ng L ~ (-1), PAEs in different STP, respectively. The prediction results of STP model showed that the removal process of PAEs in STP was mainly biodegradable, and that DPP,DNP and DEHP could be removed by sludge to some extent due to high lg Koc,.
【作者单位】：环境保护部南京环境科学研究所国家环境保护农药环境评价与污染控制重点实验室;南京工业大学环境学院;南京沙夫特环境科技有限公司;
【基金】：国家高技术研究发展计划(863)项目(2013AA060A308) 环境保护公益性行业科研专项(201309028)
【分类号】：X703

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