State Key Laboratory of Geohazard Prevention and Geoenvironment Protection (Chengdu University of Technology), Chengdu 610059, China; State Environmental Protection Key Laboratory of Synergetic Control and Joint Remediation for Soil & Water Pollution (Chengdu University of Technology), Chengdu 610059, China; College of Ecology and Environment (Chengdu University of Technology), Chengdu 610059, China.
State Key Laboratory of Geohazard Prevention and Geoenvironment Protection (Chengdu University of Technology), Chengdu 610059, China; State Environmental Protection Key Laboratory of Synergetic Control and Joint Remediation for Soil & Water Pollution (Chengdu University of Technology), Chengdu 610059, China; College of Ecology and Environment (Chengdu University of Technology), Chengdu 610059, China.
Waste Manag. 2022 Feb 15;139:330-340. doi: 10.1016/j.wasman.2021.11.036. Epub 2022 Jan 7.
The environmental risk assessment and the factors influencing heavy metals (HM) in the soil at the municipal solid waste landfill sites (MSWLs) were studied by literature review, field survey, and statistical methods. The results indicated that the dominant HM contamination in the soil at the MSWLs was caused by chromium (Cr) with the Nemero index values (PI) from 22.7 to 44.3 and zinc (Zn) with the PI from 0.7 to 9.8. There were significant differences in the Cr, mercury (Hg), lead (Pb), Zn, and arsenic (As) concentrations between soil samples from sanitary and non-sanitary landfills (NSLs) where HM contamination (PI = 10.9) was more obvious. As (CRA = 2.35 × 10) and cadmium (Cd) (CRA = 1.45 × 10) posed potential carcinogenic health effects. The soil Cd concentration had a significant negative correlation (r = -0.476) with the landfill age. The soil As concentration had a significant positive correlation (r = 0.472) with rainfall in NSLs. There were significant differences in the As (P = 0.042) and copper (Cu) (P = 0.042) concentrations between soil samples from the surrounding areas of MSWLs and the base where soil had higher HM concentrations. For the efficient prevention of HM ecological risk, a scientific site selection, undamaged coverage and anti-seepage systems, standardized management, and ongoing monitoring are required.
采用文献回顾、野外调查和统计方法研究了城市固体废物填埋场（MSWLs）土壤中重金属（HM）的环境风险评估和影响因素。结果表明，MSWLs 土壤中主要的 HM 污染是由铬（Cr）引起的，其内梅罗指数（PI）值为 22.7 至 44.3，锌（Zn）的 PI 值为 0.7 至 9.8。卫生和非卫生填埋场（NSLs）土壤样本中的 Cr、汞（Hg）、铅（Pb）、Zn 和砷（As）浓度存在显著差异，其中 HM 污染（PI=10.9）更为明显。As（CRA=2.35×10）和 Cd（CRA=1.45×10）具有潜在的致癌健康影响。土壤 Cd 浓度与填埋场年龄呈显著负相关（r=-0.476）。NSLs 土壤中 As 浓度与降雨量呈显著正相关（r=0.472）。MSWLs 周围地区和底部土壤中 As（P=0.042）和 Cu（P=0.042）浓度存在显著差异，底部土壤中 HM 浓度较高。为了有效预防 HM 生态风险，需要进行科学选址、无损覆盖和防渗系统、标准化管理和持续监测。
