煤气化废水中挥发酚污染物的健康风险评价

Health risk assessment of gasification volatile phenol pollutants in wastewater

摘要:

通过哈尔滨某气化厂的实例研究,采用数学模型,考虑气化废水的水质、常规工艺对污染物的去除情况以及突发事件状况下废水的排放等因素,重点研究了挥发酚污染物进入地表水环境可能引起的健康风险.研究结果表明:挥发酚在该纳污水体中的质量浓度所引起的非致癌健康风险为1.67×10-7/a～9.12×10-7/a,该风险值小于非致癌性污染物的可接受水平,但是,在污水处理系统事故排放状态下,纳污水体挥发酚所造成的健康风险是污水系统正常工况下的5.3倍多.事故状态下的健康风险值为可接受水平的88.3%～91.2%,已经接近可接受水平的限值,事故性排放增加了环境健康风险.

Abstract:

A case study of a gasification plant in Harbin was performed using mathematical models,with the consideration of the water quality of waste gasification,conventional processes for removal of pollutants, wastewater discharge in emergency situations and other factors. Health risks caused by the volatile phenol pollution in the surface water environment were analyzed. The results show that the non-carcinogenic health risks caused by volatile phenol in the water are in the range of 1. 67 ×10-7 /a-9. 12 ×10-7 /a,which are less than the acceptable level of non-carcinogenic pollutants. But in the discharge state in an accident in the sewage treatment system,health risks caused by volatile phenol pollution are 5. 3 times of those under normal operating conditions. The health risks value of an accident is 88. 3%-91. 2% of the acceptable level,close to the limits of the acceptable level,and accidents have greatly increased the environmental health risks.