3MRA风险模型在铬渣整治项目制定过程中的应用

Application of 3MRA model in the decision-making for comprehensive chrome residue treatment

选用美国环境保护署现行废物风险评价模型(3MRA)对某铬渣整治项目进行环境风险评价.模拟了治理前后区域内环境风险情况.分析了污染物暴露途径及危害对象.通过模型对该项目预定处置方法可行性进行了验证.模拟结果显示,在95%受保护对象、95%置信水平条件下,铬渣堆存区域存在显著的环境风险,周边居民致癌风险在10-4数量级,水域生态风险危害商数>1.而在对铬渣进行解毒填埋处置后,环境风险将有效降低,验证了此项目处置方法的可行性.

Multimedia,multipathway and multireceptor risk assessment model（3MRA）,a waste risk assessment model currently used by USEPA,was applied to assess the environmental risks of chrome residue management project in a chromic salt factory.During the assessing process,the environmental risks before and after management in this area were simulated;meanwhile the pollutant exposure pathways and the harm sufferers were also analyzed.The feasibility of the scheduled treatment methods was verified by this model.The simulation results showed that under the condition of 95% protected objects and 95% confidence level,chrome residue stacks brought significant environmental risk to this area;the carcinogenic risk level of neighboring residents came to the order of 10-4,the hazard quotient of aquatic ecology risk was above 1.The environmental risk decreased sharply after the detoxified landfill of chrome residues,which verified the feasibility of such treatment.