中水灌溉绿地对人体健康影响的风险性评价

结合中水绿地灌溉对植物影响的研究,采用美国国家科学院(NAS)提出的四步评价法,对深圳罗芳污水治理厂生产的中水水质中有害的化学物质和致病微生物检测结果进行了评价。结果表明,中水水质中的化学致癌物质(铬、砷、镉)、化学非致癌物质(铅、镍、氰化物、氟化物、氨氮、挥发酚)致癌风险P分别在10-6/a、10-7/a数量级以下,分别小于国际权威机构制定的风险阈值10-5/a、10-6/a数量级;致病微生物(轮状病毒、甲肝病毒、柯萨奇病毒)致病风险P均在10-5数量级以下,小于风险阈值10-4数量级。由此表明,中水运用于城市绿地灌溉中是安全的、可行的,不会对人体的健康造成危害。

Study on Health Risk Assessment of Reclaimed Water Used for Greenbelt Irrigation

Based on the study on the effect of reclaimed irrigation on water greenbelt plants,the harmful chemical matters and pathogenic microorganism content in reclaimed water produced from Shenzhen Luofang Sewage Treatment Plant are assessed by using the Method of Four Step Risk Assessment of USA National Academy of Sciences(NAS),and the results show that the risk P of the chemical carcinogens(Cr,As,Cd) and the chemical non-carcinogens(Pb,Ni,CN-,F-,HN3-N,et al) are under the 10-6/a,10-7/a number level,respectively,which are less than the risk upper threshold value,namely 10-5/a and 10-6/a number level,established by international authority institute;the risk P of the pathogenic microorganism(Rotavirus,Coxsackie,Hepatitis) are 10-6 number level,which are less than the risk upper threshold value,namely 10-4 number level.Accordingly,the use of reclaimed water in greenbelt irrigation is safe and feasible and not harmful for public health.