中文关键词城市生活垃圾(MSW)露天焚烧地累积指数法(I_geo)重金属健康风险评价 英文关键词municipal solid waste(MSW)open burninggeo-accumulation index method(I_geo)heavy metalshealth risk assessment

作者	单位	E-mail
程轲	河南师范大学环境学院, 黄淮水环境与污染防治教育部重点实验室, 新乡 453007	18858154190@163.com
季婉婉	河南师范大学环境学院, 黄淮水环境与污染防治教育部重点实验室, 新乡 453007
郝炜伟	河南师范大学环境学院, 黄淮水环境与污染防治教育部重点实验室, 新乡 453007
王艳	河南师范大学环境学院, 黄淮水环境与污染防治教育部重点实验室, 新乡 453007 新乡医学院公共卫生学院, 新乡 453003
易鹏	中国环境科学研究院, 北京 100012
支国瑞	中国环境科学研究院, 北京 100012
张佳羽	河南师范大学环境学院, 黄淮水环境与污染防治教育部重点实验室, 新乡 453007
张洋	河南师范大学环境学院, 黄淮水环境与污染防治教育部重点实验室, 新乡 453007
张诗澜	河南师范大学环境学院, 黄淮水环境与污染防治教育部重点实验室, 新乡 453007

中文摘要 利用烟气稀释采样系统，针对不同功能区城市生活垃圾（MSW）样品，分别考虑桶内焚烧和自然堆积焚烧两种常见露天焚烧方式，对城市生活垃圾露天焚烧排放PM_2.5中重金属的污染特征及其居民暴露健康风险进行分析和评估.结果表明，5种不同组分垃圾焚烧排放的重金属中，锌（Zn）含量均为最高，可达1324.03~3703.12 mg·kg^-1，镉（Cd）含量最低，为20.25~63.68 mg·kg^-1；地累积指数结果显示，铅（Pb）、Zn、砷（As）和Cd的污染程度较高，自然堆积焚烧下均已达中度及以上污染水平，Cd的地累积污染指数远大于5；人体健康风险评估结果表明，8种重金属（Pb、Zn、Cu、Mn、As、Cd、Cr和Ni）经呼吸暴露的非致癌风险值均小于1，属于安全范围内；自然堆积焚烧下，As和Pb对儿童经皮肤接触的非致癌总风险值大于1，存在非致癌风险；4种致癌元素（As、Cd、Cr和Ni）的致癌风险值均小于1.0×10^-4，但若长期处于这种环境下，会存在较低的潜在致癌风险. 英文摘要 The characteristics and health risk assessment for heavy metal pollutants in PM_2.5 discharged from the open burning of municipal solid waste (MSW) in different functional areas were studied using a flue gas diluted sampling system. The two common open burning modes of barrel and natural pile-up burning were considered. The results show that the concentration of zinc (Zn) was the highest among the heavy metals produced by five different components of waste incineration, ranging from 1324.03 to 3703.12 mg·kg^-1. The concentration of cadmium (Cd) was the lowest, ranging from 20.25 to 63.68 mg·kg^-1. According to the geo-accumulation index, lead (Pb), Zn, arsenic (As), and Cd were highly polluted in the measured MSW samples, and all four of these metals reached moderate or higher levels of pollution under natural pile-up burning methods. The geo-accumulation index of Cd was much higher than 5. The results of the human health risk assessment showed that non-carcinogenic risk values for 8 heavy metals (Pb, Zn, Cu, Mn, As, Cd, Cr, and Ni) by respiratory exposure were less than 1, which is within the safe range. For natural pile-up burning, the total non-carcinogenic risk values for As and Pb for children were higher than 1, indicating a non-carcinogenic risk. The carcinogenic risk values for four carcinogenic elements (As, Cd, Cr, and Ni) were less than 1.0×10^-4, but still represented a low potential carcinogenic risk under exposure for long periods of time.

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