摘要
焚烧是城市垃圾处理主流技术,飞灰作为垃圾焚烧主要污染物成为垃圾焚烧污染控制关键环节。采集拉萨市垃圾焚烧发电厂飞灰样品,分析了飞灰中重金属含量及浸出毒性特征,并采用改进的潜在风险评价法及健康风险评价法评价飞灰中重金属的潜在风险。结果表明:拉萨市飞灰中重金属含量较高,且Pb的浸出浓度超过GB 5085.3—2007《危险废物鉴别标准浸出毒性鉴别》浸出液最高允许值的16倍。污染评价结果表明,拉萨市飞灰中Pb对环境具有极强的污染风险。健康风险评价结果表明,飞灰中重金属对人体的致癌风险在可接受范围内,但其非致癌风险值高于美国国家环境保护局(EPA)推荐的非致癌风险值(HQ≤1),对人体具有较高的非致癌风险。其中Pb对成人和儿童的非致癌风险值分别为3.8975和9.7458,是非致癌风险的主要贡献者。
Incineration is the mainstream technology of municipal solid waste treatment.Fly ash,as the main pollutant of waste incineration,has become a key link in waste incineration pollution control.In this study,we collected fly ash samples from waste incineration power plants in Lhasa,and analyzed the heavy metals content and leaching toxicity characteristics,and adopted improved potential risk assessment method and health risk assessment method to evaluate the risk of heavy metals in fly ash.The results showed that the heavy metals content of fly ash in Lhasa was relatively high,and the leaching concentration of Pb obviously exceeded the maximum allowable value of the leaching solution in the Identification Standard for Hazardous Wastes(GB 5085.2—2007).Pollution evaluation results showed that Pb in fly ash had heavy risk of pollution to the environment.The health risk assessment results showed that the carcinogenic risk of heavy metals in fly ash to humans was within an acceptable range,but its non-carcinogenic risk value was higher than the non-carcinogenic risk value recommended by the U.S.Environmental Protection Agency(EPA),indicating had a higher non-carcinogenic risk on human body.Among them,the non-carcinogenic risk values of Pb for adults and children were 3.8975 and 9.7458 respectively,which was the main contributor to the non-carcinogenic risk.
作者
倪海凤
旦增
周文武
周鹏
许飞
杨涛
孟德安
陈冠益
NI Haifeng;DAN Zeng;ZHOU Wenwu;ZHOU Peng;XU Fei;YANG Tao;MENG Dean;CHEN Guanyi(School of Science,Tibet University,Lhasa 850000,China;Tianjin University of Commerce,Tianjin 300072,China)
出处
《环境工程》
CAS
CSCD
北大核心
2022年第3期89-93,131,共6页
Environmental Engineering
基金
国家自然科学基金项目(51668056)
国家自然科学基金项目(52160026)
西藏大学研究生“高水平人才培养计划”项目(2019-GSP-S045)
科技部国家重点研发计划项目(2019YFC1904101)。
关键词
拉萨
飞灰
重金属
特性
健康风险评估
Lhasa
fly ash
heavy metals
characteristics
health risk assessment
