再生水回用的改进健康风险评价及土壤承载能力研究

Study on Reclaimed Water Reuse of Improve Health Risk Assessment and Soil Carrying Capacity

为揭示各重金属污染指标的健康风险水平和再生水回用于灌溉的最大承载水量,以西安市某污水处理厂的再生水出水为研究对象,从污染源到暴露点建立3种暴露途径物理模型,利用Logistic混沌系统产生较为可靠的随机数,采用改进蒙特卡罗模拟方法进行健康风险水平评估,结合土壤中各指标的污染标准和背景值,计算再生水灌溉的最大承载水量。结果表明:在3种不同的暴露途径情况下,指标砷都会产生一定的风险影响,当暴露途径为再生水→地表水→水产品→人体吸收时,指标铜和锌同样对人体健康风险产生影响的概率较高,再生水回用于园林灌溉和农业灌溉不会产生重金属污染。

In order to reveal the health risks of heavy metal pollution and the maximum carrying capacity in the reclaimed water reuse for irrigation.Established three kinds of exposure physical models from the sources to the exposed points,used the Logistic chaotic system method to generate more reliable random number and used Monte Carlo simulation methods to improve the level of risk assessment,then calculated the maximum load reclaimed water for irrigation water combining with the various indicators of soil pollution standards and background values.The results show that the index arsenic will have a certain degree risk in three different exposure pathways circumstances,the index copper and zinc also have an impact on human health risks of the higher probability and the recycled water for garden irrigation and agricultural irrigation will not produce heavy metal pollution when the exposure pathways is the reclaimed water → surface water → fish → the body to absorb.