Liang Zengyin, Tu Xiang, Liu Hongbao, Zhang Kunfeng, Pan Qi, He Xiaosong, Jia Yongfeng, Sang Yimin
State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China; State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution, Chinese Research Academy of Environmental Sciences, Beijing 100012, China; Beijing Institute of Petrochemical Technology, Beijing 102617, China.
State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China.
J Hazard Mater. 2025 May 5;488:137456. doi: 10.1016/j.jhazmat.2025.137456. Epub 2025 Feb 1.
The occurrence characteristics of volatile and semi-volatile organic compounds (VOCs/SVOCs) in landfills and the mechanisms driving their migration into groundwater remain unclear. The composition and concentration of VOCs/SVOCs in 14 landfill sites and surrounding groundwater in China were analyzed to explore the distribution characteristics, sources and migration patterns of VOCs/SVOCs in landfills in China. The results showed that, a total of 81 VOCs/SVOCs from nine categories were identified, including monocyclic aromatic hydrocarbons (MAHs), phthalate acid esters and polycyclic aromatic hydrocarbons (PAHs), and which originated mainly from organic solvents and plasticizers. Among the MAHs, ethylbenzene, toluene, m,p-xylene, and o-xylene (BTEX compounds) were measured at 240.0 mg/kg, 147.6 mg/kg, 179.9 mg/kg, and 75.7 mg/kg, respectively. Bis(2-ethylhexyl) phthalate had the highest detection rate (34.4 %), and 19 PAHs were detected, with concentrations ranging from 0.1 to 31.4 mg/kg. Landfills along the eastern coast exhibited a greater variety of VOCs/SVOCs than inland landfills, and the detection concentrations and rates of VOCs/SVOCs in the middle layer of the landfill were higher. The VOCs were more prone to groundwater migration than the SVOCs, with the order of phenols > anilines > halogenated aromatic and chlorinated aliphatic hydrocarbons > MAHs > PAHs. For the first time, the occurrence characteristics of 81 VOCs/SVOCs in solid waste and their potential influence on groundwater were systematically investigated. This study systematically reveals the pollution risk of VOCs/SVOCs in landfill waste to groundwater and provides a scientific basis for the formulation of pollution control measures.
垃圾填埋场中挥发性和半挥发性有机化合物（VOCs/SVOCs）的赋存特征以及它们迁移至地下水中的驱动机制仍不明确。分析了中国14个垃圾填埋场及其周边地下水中VOCs/SVOCs的组成和浓度，以探究中国垃圾填埋场中VOCs/SVOCs的分布特征、来源及迁移模式。结果表明，共鉴定出9类81种VOCs/SVOCs，包括单环芳烃（MAHs）、邻苯二甲酸酯和多环芳烃（PAHs），其主要来源于有机溶剂和增塑剂。在MAHs中，乙苯、甲苯、间/对二甲苯和邻二甲苯（BTEX化合物）的含量分别为240.0mg/kg、147.6mg/kg、179.9mg/kg和75.7mg/kg。邻苯二甲酸二（2-乙基己基）酯的检出率最高（34.4%），共检测出19种PAHs，浓度范围为0.1至31.4mg/kg。东部沿海地区的垃圾填埋场中VOCs/SVOCs的种类比内陆垃圾填埋场更多，且垃圾填埋场中层的VOCs/SVOCs检出浓度和检出率更高。VOCs比SVOCs更易于向地下水迁移，迁移顺序为酚类>苯胺类>卤代芳烃和氯代脂肪烃>MAHs>PAHs。首次系统研究了81种VOCs/SVOCs在固体废弃物中的赋存特征及其对地下水的潜在影响。本研究系统揭示了垃圾填埋场废弃物中VOCs/SVOCs对地下水的污染风险，为制定污染控制措施提供了科学依据。
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