常规工艺再生水效果及其回用健康风险评价

Health risk assessment of reclaimed wastewater by conventional process

对常规处理工艺再生城市污水的效果进行了试验研究,初步讨论评价了再生水中化学污染物对人体的健康风险。研究结果表明,常规处理工艺对城市污水再生效果较好,可以有效去除有机物和浊度物质,对大肠菌群去除率集中在99.9％～99.99％之间,混凝沉淀去除Cu,Fe,Mn,Pb效果较好,对Ni,As,Cd的去除效果较差。对再生水风险评价结果显示,常规处理再生水的健康风险主要来自致癌物质,终生致癌风险在10^(-5)数量级,而非致癌物健康危害风险在10^(-9)数量级。

The treatment effects of secondary effluent of wastewater treatment plant by conventional treatment process are studied. The experimental results show that this technique can remove turbidity and organic matter effectively. This process can remove 99.9 to 99.99 percent of coliform fairly and has favorable removal ability to heavy metals like Cu, Fe, Mn and Pb, although the Ni, As and Ca are removed poorly. The health risk of conventional reclaimed wastewater mainly lays on carcinogens. The lifetime cancer risk of reclaimed wastewater is in order magnitude of 10 and the no cancer risk is 10