Department of Environmental Science and Engineering, Beijing University of Chemical Technology, Beijing, 100029, China.
School of Economics and Management, Beihang University, Beijing, 100191, China.
Environ Pollut. 2022 Apr 1;298:118816. doi: 10.1016/j.envpol.2022.118816. Epub 2022 Jan 8.
As primary anthropogenic emission source of toxic pollutants such as heavy metals and polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs), municipal solid waste (MSW) incineration has caused worldwide concern. However, a comprehensive analysis of the pollution characteristics and health risks of PCDD/Fs and heavy metals in soils around MSW incineration plants is lacking. In this study, 17 PCDD/Fs and 11 heavy metals in soil samples collected near MSW incineration plants in Sichuan province were investigated to evaluate their pollution characteristics and potential health risk. Sichuan was selected as the study area because the MSW incineration amount in this province ranks first among all inland provinces in China. The PCDD/Fs concentrations ranged from 0.30 to 7.50 ng I-TEQ/kg, which were significantly below risk screening and intervention thresholds. Regarding heavy metals, principal component analysis suggested that Hg, Pb and Zn were the primary metals emitted from the MSW incineration plants. Cluster analysis of PCDD/Fs and heavy metals showed that of PCDD/Fs homologs and heavy metals (e.g., Hg, Pb, Zn and Cd) were clustered into one group, indicating the coexistence and coaccumulation of heavy metals (especially Hg, Pb, Zn, and Cd) and PCDD/Fs in soil. These heavy metals are thus candidate tracers for PCDD/Fs in soil near MSW incineration plants. A health risk analysis found that the carcinogenic and non-carcinogenic risks of PCDD/Fs and heavy metals (except for Ni) in the soil samples were all within acceptable levels. This study provides new insights into correlations and health risks of PCDD/Fs and heavy metals in surface soil near MSW incineration plants. The findings have implications for future studies of environmental and human health risk analysis related to waste incineration.
作为有毒污染物（如重金属和多氯二苯并对二恶英和二苯并呋喃（PCDD/Fs））的主要人为排放源，城市固体废物（MSW）焚烧引起了全球关注。然而，目前缺乏对 MSW 焚烧厂周围土壤中 PCDD/Fs 和重金属的污染特征和健康风险的综合分析。在这项研究中，调查了四川省 MSW 焚烧厂附近土壤样品中 17 种 PCDD/Fs 和 11 种重金属，以评估其污染特征和潜在的健康风险。选择四川省作为研究区域，是因为该省的 MSW 焚烧量在中国所有内陆省份中排名第一。PCDD/Fs 浓度范围为 0.30 至 7.50 ng I-TEQ/kg，明显低于风险筛选和干预阈值。关于重金属，主成分分析表明，Hg、Pb 和 Zn 是 MSW 焚烧厂排放的主要金属。PCDD/Fs 和重金属的聚类分析表明，PCDD/Fs 同系物和重金属（如 Hg、Pb、Zn 和 Cd）聚类为一组，表明重金属（尤其是 Hg、Pb、Zn 和 Cd）和 PCDD/Fs 在土壤中同时存在和共积累。因此，这些重金属是 MSW 焚烧厂附近土壤中 PCDD/Fs 的候选示踪剂。健康风险分析发现，土壤样品中 PCDD/Fs 和重金属（Ni 除外）的致癌和非致癌风险均在可接受水平之内。本研究为 MSW 焚烧厂附近地表土壤中 PCDD/Fs 和重金属的相关性和健康风险提供了新的见解。这些发现对未来与废物焚烧相关的环境和人类健康风险分析的研究具有重要意义。
