再生水用于绿化灌溉的健康风险评价研究

On risk assessment of reclaimed water reuse for municipal green area irrigation

以北京市某再生水利用工程为例,用健康风险评价的方法,对再生水用于公园绿化灌溉时接触人群的暴露水平和健康风险进行了系统研究,建立了再生水用于公园绿化灌溉的健康风险评价模型,提出了再生水对职业人员和公众的暴露参数,对再生水中氯仿等19种主要污染物的健康风险进行了定量评价。结果表明:职业人群致癌的总危险度为3.91×10-6;非职业人群致癌的总危险度中青年和老年分别为2.12×10-6、1.27×10-6,均小于可接受健康危险水平10-5。

The principle of health risk assessment is used to research the exposure level and the health risk of concerned people in a wastewater reuse project where the reclaimed water is applied for green area irrigation in a public park in Beijing. A health risk assessment model for reclaimed water irrigation of public green area has been established and the exposure indexes of reclaimed water to professional and public people have been proposed. The human health risk influences of the main pollutants such as chloroform and 19 substances, which are often appeared in reclaimed water, are estimated quantitatively. The research results show that for the professional people the total cancer risk factor is 3. 91×10^-6, and for the public it is 2.12×10^-6 or 1.27×10^-6 for young- middle or advanced age respectively. All these are lower than the allowable health level 10^-5.