URS Australia Pty Ltd., 1 Southbank Blvd, Southbank, Victoria 3006, Australia.
Environ Sci Process Impacts. 2013 Jun;15(6):1153-61. doi: 10.1039/c3em30971a.
At a municipal solid waste landfill in southern California (USA) overlying a natural gas reservoir, methane was detected at concentrations of up to 40% (by volume) in perimeter soil gas probes. Stable isotope and (14)C values of methane together with gas composition (major components and volatile organic compounds) data were evaluated to assess the relative contributions of landfill gas and natural gas to the measured methane concentrations. The data was further used to estimate the residence time of the landfill gas in the probes. Results showed that up to 37% of the measured methane was derived from landfill gas. In addition, the landfill gas in the probe samples has undergone extensive alteration due to dissolution of carbon dioxide in pore water. Data further indicates that the measured methane was released from the waste approximately 1.2 to 9.4 years ago, rather than representing evidence of an ongoing release.
在加利福尼亚州南部（美国）的一个城市固体废物填埋场，在一个天然气储层上方，周边土壤气体探头中检测到甲烷浓度高达 40%（体积）。评估了甲烷的稳定同位素和 （14）C 值以及气体组成（主要成分和挥发性有机化合物）数据，以评估垃圾填埋气和天然气对测量甲烷浓度的相对贡献。该数据进一步用于估算填埋气在探头中的停留时间。结果表明，高达 37%的测量甲烷来自垃圾填埋气。此外，由于孔隙水中二氧化碳的溶解，探头样品中的垃圾填埋气发生了广泛的变化。数据进一步表明，测量到的甲烷是大约 1.2 到 9.4 年前从废物中释放出来的，而不是表明正在释放的证据。
