Department of Environmental Engineering, Building 115, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark.
Department of Environmental Engineering, Building 115, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark.
Waste Manag. 2021 Mar 1;122:113-123. doi: 10.1016/j.wasman.2021.01.001. Epub 2021 Jan 24.
In 1997, the landfilling of biodegradable waste was banned in Denmark, and currently Danish landfills receive mostly non-combustible waste with a low-organic content. This study aimed to investigate trace gas composition in landfill gas (LFG) at modern Danish landfills. Landfill gas samples were taken from waste cells containing shredder, mixed and aged waste from four Danish landfills. The highest trace gas concentrations were found in shredder waste cells (average concentration of 10 mg m), which were comparable with conventional municipal solid waste landfills receiving organic waste. Aliphatic hydrocarbons and aromatics were dominant in the shredder waste cells, most likely released through direct volatilisation from disposed waste products. Abundant oxygenated compounds were found in the shredder waste cell in one of the landfills, thereby indicating a higher level of organic fraction biodegradation. Benzene, toluene, ethylbenzene and xylenes (BTEXs) were measured in high concentrations in all shredder waste cells, contributing to more than 75% of total aromatics. Considerably lower concentrations of trace gases were measured in the mixed and aged waste cells, which were dominated by hydrogen sulphide and several aliphatic hydrocarbons. A constant concentration ratio was established between aliphatic hydrocarbons together with aromatics and methane in shredder waste cells, which was then used in an LFG generation model to estimate trace gas production. The production rates of BTEXs from two landfills were estimated at 272 and 73 kg yr in 2020, which were not considered to pose a significant risk to the environment or to human health.
1997 年，丹麦禁止可生物降解废物进行填埋处理，目前丹麦的垃圾填埋场主要接收有机含量低的不可燃废物。本研究旨在调查现代丹麦垃圾填埋场中垃圾填埋气（LFG）中的痕量气体组成。从四个丹麦垃圾填埋场的垃圾填埋单元中采集了垃圾填埋气样品，这些单元中含有碎料机、混合和老化废物。在碎料机废物单元中发现了最高的痕量气体浓度（平均浓度为 10mg/m3），与接收有机废物的传统城市固体废物填埋场相当。在碎料机废物单元中，脂肪族烃和芳烃占主导地位，很可能是通过处置废物的直接挥发释放出来的。在其中一个垃圾填埋场的碎料机废物单元中发现了大量的含氧化合物，这表明有机部分的生物降解程度更高。在所有碎料机废物单元中均测量到了高浓度的苯、甲苯、乙苯和二甲苯（BTEXs），占总芳烃的 75%以上。在混合和老化废物单元中测量到的痕量气体浓度要低得多，这些单元主要由硫化氢和几种脂肪族烃组成。在碎料机废物单元中，建立了脂肪族烃与芳烃和甲烷之间的恒定浓度比，然后在垃圾填埋气产生模型中使用该浓度比来估计痕量气体的产生。根据两个垃圾填埋场的数据，2020 年 BTEXs 的产生速率分别估计为 272kg/yr 和 73kg/yr，这些估计值不被认为会对环境或人类健康构成重大风险。
