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中文摘要：
多环芳烃等有毒有机微污染物对污水处理综合指标BOD、COD和TOC等的贡献极小，但危害却很大。采用固相萃取的前处理方法和GC／MS、GC／μECD的分析方法，针对北京市某污水处理厂的总泵进水、二沉出水以及混凝沉淀出水中有机氯农药、多环芳烃和酚类的浓度进行分析。研究结果表明，在不同处理工艺段中，有机氯农药、多环芳烃和酚类的质量浓度分别为nd～10、nd～835、nd～3248μg／L。所有检出化合物均未超出中国污水与地表水相应标准限值，其中多环芳烃和酚残留水平较高，应为重点监测对象。这些污染物多数能够在二级处理过程中得到有效去除，但混凝沉淀并没有显著地进一步去除效果。
英文摘要：
Although trace toxic organic pollutants, such as polycyclic aromatic carbons （PAHs）, is a small contributor of the total organic content of an aqueous sample, they are potential hazards to the environment. Using solidphase extraction followed by GC/MS and/or GC/μECD analysis, many organochlorine pesticides （OCPs）, PAHs and phenols in the samples of influent, secondary and final effluents of a sewage treatment plant in Beijing were analyzed. The amount of OCPs, PAHs and phenols detected were nd～10, nd～835 and nd～3 248 ng/L, respectively; they were all below the corresponding concentration limits for wastewater and surface water in China. The PAHs and phenols that were present in higher concentrations relative to others should be monitored regularly. Most contaminants detected in this study were removed in the secondary treatment stage, and the residuals were further removed in the final coagulation-sedimentation treatment stage.
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