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以城市污水为水源的再生水中含有一定量的雌激素类内分泌干扰物,其在无计划间接补充饮用水过程中存在潜在健康风险.针对再生水经河流补给湖库型水源地的典型场景,研究了再生水中雌酮、雌二醇、17α-乙炔基雌二醇、双酚A、壬基酚和辛基酚在水体中的变化规律,评价了雌激素的健康风险.结果表明,再生水(二级出水)中雌激素类物质的质量浓度多分布在0.1~100 ng·L-1水平;双酚A和壬基酚的浓度较高,可达到1~10μg·L-1水平.再生水间接补充饮用水过程中,雌激素的浓度受到上游来水稀释、河道湖库自然降解和饮用水处理工艺去除等作用的影响.雌酮、雌二醇、双酚A、壬基酚和辛基酚的非致癌风险较小,都低于规定值1.当湖库型水源地的水力停留时间大于30 d时,再生水中17α-乙炔基雌二醇对人体的非致癌风险值大多小于1;当停留时间小于10 d且再生水占饮用水比例达50%以上时,16%~47%样品的17α-乙炔基雌二醇的非致癌风险值大于1,其健康风险需优先关注.
The reclaimed water, which contains urban sewage as its source, contains a certain amount of estrogen endocrine disruptors, which poses potential health risks in the process of unplanned indirect replenishment of drinking water.Aiming at the typical scenario where reclaimed water is replenished from lake-source water by rivers, The changes of estrone, estradiol, 17α-ethynyl estradiol, bisphenol A, nonylphenol and octylphenol in water were evaluated in order to evaluate the health risks of estrogen.The results showed that the regeneration water Water), the concentrations of estrogenic substances ranged from 0.1 ng / L to 100 ng · L-1, and the concentrations of BPA and nonylphenol were high, reaching 1 ~ 10 μg · L-1. In the process of water, the concentration of estrogen is affected by the upstream water dilution, the natural degradation of river lacustrine reservoir and the removal of drinking water treatment process, etc. Estrone, estradiol, bisphenol A, nonylphenol and octylphenol Less carcinogenic risk, are lower than the specified value 1. When the hydraulic retention time of lake reservoir type water source is greater than 30 d, the non-carcinogenic risk of 17α-ethynyl estradiol in reclaimed water is mostly less than 1; when the residence time Less than 10 days and the proportion of reclaimed water to drinking water up For non-carcinogenic 17a-ethinylestradiol values above 16% to 47% for samples above 50%, a greater than 1 risk for non-carcinogenicity of 17α-ethinylestradiol should be prioritized for their health risks.