State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, PR China; University of Chinese Academy of Sciences, Beijing, 100049, PR China.
State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, PR China; National Engineering Laboratory for VOCs Pollution Control Material & Technology, University of Chinese Academy of Sciences, Beijing, 101408, PR China.
J Environ Manage. 2023 Jan 1;325(Pt B):116659. doi: 10.1016/j.jenvman.2022.116659. Epub 2022 Nov 3.
Landfill sites are sources of gaseous volatile compounds. The dumping area (LDA) and leachate storage pool (LSP) of two typical rural domestic waste landfill sites in north China (NLF) and southwest China (SLF) were investigated. We found that 45, 46, 61 and 68 volatile organic compounds (VOC) were present in the air of NLF-LDA, NLF-LSP, SLF-LDA, and SLF-LSP, respectively. And there were 27, 29, 35 and 37 kinds of odorous compounds being detected. Oxygenated compounds (>48.88%), chlorinated compounds (>6.85%), and aromatics (>5.46%), such as organic acid, 1-chlorobutane, and benzene, were the most abundant compounds in both landfills. The SLF-LDA had the highest olfactory effect, with a corresponding total odor activity value of 29,635.39. The ozone-formation potential analysis showed that VOCs emitted from SLF landfills had significantly higher potential for ozone formation than those from NLF landfills, with ozone generation potentials of 166.02, 225.86, 2511.82, and 1615.99 mg/m for the NLF-LDA, NLF-LSP, SLF-LDA, and SLF-LSP, respectively. Higher chronic toxicity and cancer risk of VOCs were found in the SLF according to method of Risk Assessment Information System. Based on the sensitivity analysis by the Monte Carlo method, concentrations of benzene, propylene oxide, propylene, trichloroethylene, and N-nitrosodiethylamine, along with exposure duration, daily exposure time, and annual exposure frequency, significantly impacted the risk levels. We provide a scientific basis, which reflects the need for controlling and reducing gaseous pollutants from landfills, particularly rural residential landfills, which may improve rural sanitation.
垃圾填埋场是气态挥发性化合物的来源。本研究调查了中国北方（NLF）和中国西南（SLF）两个典型农村生活垃圾填埋场的垃圾填埋区（LDA）和渗滤液储存池（LSP）。结果表明，NLF-LDA、NLF-LSP、SLF-LDA 和 SLF-LSP 空气中分别存在 45、46、61 和 68 种挥发性有机化合物（VOC），检测到 27、29、35 和 37 种有气味的化合物。含氧化合物（>48.88%）、含氯化合物（>6.85%）和芳烃（>5.46%），如有机酸、1-氯丁烷和苯，是两个垃圾填埋场中最丰富的化合物。SLF-LDA 的嗅觉效果最高，相应的总气味活度值为 29635.39。臭氧形成潜能分析表明，SLF 填埋场排放的 VOCs 对臭氧形成的潜在影响明显高于 NLF 填埋场，NLF-LDA、NLF-LSP、SLF-LDA 和 SLF-LSP 的臭氧生成潜力分别为 166.02、225.86、2511.82 和 1615.99 mg/m。根据风险评估信息系统方法，发现 SLF 中的 VOC 具有较高的慢性毒性和致癌风险。通过蒙特卡罗法的敏感性分析，发现苯、环氧丙烷、丙烯、三氯乙烯和 N-亚硝基二乙胺的浓度，以及暴露时间、每日暴露时间和年暴露频率，对风险水平有显著影响。本研究为控制和减少垃圾填埋场，特别是农村居民垃圾填埋场的气态污染物提供了科学依据，这可能有助于改善农村环境卫生。
