南京某城市污水二级处理系统中酞酸酯类的分布及去除特征

以南京某城市污水厂污水和污泥中的酞酸酯类（PAEs）为研究对象，分别采用固相萃取-气相色谱-质谱联用（SPE—Gc．Ms）和超声提取．气相色谱．质谱联用（USE—GC—Ms）检测其中的优先控制污染物邻苯二甲酸二甲酯（DMP）、邻苯二甲酸二乙酯（DEP）、邻苯二甲酸二丁酯（DBP）和邻苯二甲酸单（2-乙基己基）酯（MEHP），研究其在厌氧／好氧（A／O）污泥处理过程中的分布特征及降解规律。研究结果表明，各类PAEs在该污水厂的污水和污泥中均有检出，二级处理出水中4种酞酸酯类物质的浓度在0．151—2．419μg／L。污水中4种酞酸酯的分布规律为MEHP〉DBP〉DMP〉DEP，污泥中4种酞酸酯的分布规律为MEHP〉DBP〉DEP〉DMP。该污水厂二级处理工艺对4种PAEs的去除效果较明显，去除效率DBP〉DEP〉DMP〉MEHP．

Distribution and removal characteristics of PAEs in secondary sewage process systems in a municipal sewage plant in Nanjing

Used phthalate acid esters （PAEs） as analyzed objects, SPE-GC-MS and USE-GC-MS tech- niques were adopted respectively to detect some of the priority controlled ones, such as dimethyl phthalate （DMP） ,diethyl phthalate（ DEP）, dibutyl phthalate （ DBP）, and mono-（2-ethylhexyl） phthalate （MEHP） in sewage and sludge samples in a sewage treatment plant in Nanjing, so as to achieve their distribution characteris- tics and degradation rules during the sludge A/O process. It was indicated that all of these object PAEs were found in the sewage and sludge in the sewage treatment plant. The concentration of the studied PAEs in the efflu- ent from the secondary treatment system was 0. 151 ~ 2. 419 p~g/L. The concentration order of them in the efflu- ent was MEHP 〉 DBP 〉 DMP 〉 DEP, and in the sludge it was MEHP 〉 DBP 〉 DEP ~ DMP. It was indicated that the four PAEs were removed effectively by the secondary processing in the plant, and their removal efficiencies order was DBP 〉 DEP 〉 DMP 〉 MEHP.