• 关键词：城市污水  溶解性有机物  紫外-可见光谱分析  遗传毒性

• 基金项目：国家杰出青年科学基金项目(No.50825801);国家高技术研究发展计划(863)项目(No.2008AA062502)

• 赵风云
• 1. 陕西科技大学资源与环境学院, 西安 710021; 2. 清华大学环境科学与工程系, 环境模拟与污染控制国家重点联合实验室, 北京 100084

• 孙根行
• 陕西科技大学资源与环境学院, 西安 710021

• 吴乾元
• 清华大学环境科学与工程系, 环境模拟与污染控制国家重点联合实验室, 北京 100084

• 胡洪营
• 清华大学环境科学与工程系, 环境模拟与污染控制国家重点联合实验室, 北京 100084

• 摘要：本研究利用XAD-8大孔树脂对某城市污水处理厂的厌氧-缺氧-好氧(A²O)工艺出水中的溶解性有机物进行了组分分离,分析了各组分的溶解性有机碳(Dissolved organic carbon,DOC)、紫外-可见光谱和遗传毒性.结果表明,污水中亲水性物质和疏水酸性物质的DOC含量分别占总DOC含量的65%和24%.亲水性物质组分中的芳香族化合物含量显著高于其它组分,但是单位质量的亲水性物质、疏水酸性物质和疏水碱性物质中的芳香族化合物含量相近.污水具有一定的遗传毒性,主要遗传毒性物质为亲水性物质和疏水酸性物质,而疏水碱性物质和疏水中性物质则未检出遗传毒性.

• Abstract：Dissolved organic matter(DOM)in the effluent of an anaerobic-anoxic-aerobic(A²O)process of a municipal wastewater treatment plant was fractionated into four different fractions using adsorption resins.Thereafter,the dissolved organic carbon(DOC),ultraviolet-visible(UV)spectroscopy and genotoxicity of each fraction were determined.The DOC values of the hydrophilic substrates(HIS)and the hydrophobic acids(HOA)showed these were the main fractions of DOM,comprising 65% and 24% of the total sample.UV spectroscopy indicated that HIS contained the most aromatic compounds among the DOM fractions.However,the specific UV absorbance(SUVA)value of HISwas similar to those of HOA and hydrophobic bases(HOB),suggesting that the aromatic chemicals divided by the DOC concentration in the fractions were at a similar level.The wastewater exhibited genotoxicity and HIS and HOA made the main contributions to the genotoxicity of the total sample.

• Key words：municipal wastewater  dissolved organic matter  ultraviolet-visible spectroscopy analysis  genotoxicity

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