【摘要】 研究了滇池环湖8座污水处理厂(Wastewater Treatment Plants,WWTPs)中酚类内分泌干扰物(Endocrine Disrupting Chemicals,EDCs)的存在、去除及归趋,阐明了该类物质的浓度水平、分布特征及环境归趋,明确了处理工艺及运行参数对酚类EDCs去除效果的影响,评估了出水和污泥外排对环境的污染负荷。结果表明:污水处理厂进水、出水和污泥中普遍检出了酚类EDCs,NP2EO、NP1EO和BPA是主要的酚类EDCs;8座污水处理厂进水中∑EDCs的质量浓度为2039~5 066 ng/L,出水中为420~1 536 ng/L,污泥中质量比为1 210~9 465 ng/g dw(dry weight,干重),总去除率为32%~89%;不同污水处理工艺对酚类EDCs的去除效率存在较大差异,3AMBR和A2/O工艺的去除效果较氧化沟和ICEAS工艺有明显的优势;不同的工艺参数对酚类EDCs去除的影响存在一定差异,深度处理、污泥龄和辛醇-水分配系数对酚类EDCs去除效果的影响较大;降解是污水处理厂中酚类EDCs的主要去除方式;三污、五污和六污污泥对酚类EDCs的吸附作用较强;昆明市每天进入污水处理厂的酚类EDCs总量约为3771 g,经处理后,出水外排27%。研究表明,滇池环湖污水处理厂出水及其剩余污泥具有一定的环境风险。更多还原

【Abstract】 The present paper is aimed at making an investigation of the contamination levels,distribution characteristics and environmental fate of the phenolic EDCs in the eight wastewater treatment plants around Dianchi Lake,Kunming. Thus,the goals of this paper have been put on the tracking and determining the removal efficiency of the phenolic EDCs via different wastewater treatment techniques and the operation parameters involved. At the same time,the paper also intends to make an evaluation of the pollution load via the sewage and sludge discharge in correspondence with the effectiveness and efficiency of the environment protection measures adopted in the city. As is known,phenolic EDCs has been found ubiquitously in the influent,effluent and sludge discharge with the eight WWTPs. NP2 EO,NP1EO and BPA being the predominant phenolic EDCs,whose total volume( ∑EDCs) has been worked out ranging from 2 039 ng / L to 5 066 ng / L in terms of the influent,from 420 ng / L to 1 536 ng / L in the effluent,and from 1 210 ng / g dw to 9 465 ng / g dw( dry weight) in that of the sludge. As to the removal efficiency of phenolic EDCs,it can be worked out merely at about from 32% to 89%. However,the great variety of the wastewater treatment processes has also led to a great gap in assessing the removal efficiency of phenolic EDCs with the 3AMBR and A2/ O removing processes. On the other hand,the oxidation ditch and ICEAS processes prove to be obviously inferior to that of the former,and,in turn,has brought about the gap among all the evaluation results as to the removal efficiency of phenolic EDCs. Of all the advanced treatment methods,the sludge retention time and the octanol-water partition coefficient may have quite serious effects on the removal consequence.Nevertheless,the degradation is the main pathway to remove the phenolic EDCs in WWTPs. In so doing,the activated sludge from the third,fifth and sixth WWTPs can all be detected to enjoy rather strong adsorptive power to phenolic EDCs,which can collect such a great amount of phenolic EDCs into the eight WWTPs of Kunming City as to 3771 g / d. In spite of that,27% of the contaminants can only be expected to be discharged into the purposeful aquatic channels via the effluent. What’s more,the effluent and sludge volume of the eight WWTPs are also prone to lead to a potential risks to the Dianchi bio-ecological system on the whole.更多还原