US Environmental Protection Agency, 26 West Martin Luther King Drive, Cincinnati, OH 45268, USA.
Oak Ridge Associated Universities, 26 West Martin Luther King Drive, Cincinnati, OH 45268, USA.
Waste Manag. 2023 Jun 15;165:83-93. doi: 10.1016/j.wasman.2023.04.023. Epub 2023 Apr 21.
Landfill gas (LFG) wellhead data were compared to understand the range of observations due to unique conditions at five elevated temperature landfills (ETLFs) in the U.S. Correlations of the primary gas ratio, CH:CO, show distinct compositional indicators for (1) typical operation, (2) subsurface exothermic reactions (SERs), (3) high moisture content, and (4) air intrusion that can help operators and regulators diagnose conditions across gas extraction wells. ETLFs A, B, D, and E showed similar trends, such as decreasing CH and increasing CO, CO, and H that have been previously described. ETLF C uniquely exhibited elevated CH and temperatures simultaneously due to carbonation (i.e., CO consumption) of a steel slag which was used as alternative daily cover (ADC). At the maximum gas well temperature, T = 82 °C/180 °F, CH and CO concentrations were 47% and 28%, respectively. At ETLFs A, B, and E, H > 50% were regularly observed in affected gas wells for several years. At the five ETLFs, maximum CO concentrations ranged from 1400-16,000 ppmv. Like the analysis of CH:CO, it is hypothesized here that H (%):CO (ppmv) may infer the types of waste that are thermally degrading. Co-disposal of industrial wastes and MSW and the use of potentially reactive ADCs should remain an important consideration for landfill operators and regulators because of their potential long-term impacts to LFG quality.
比较了垃圾填埋气（LFG）井口数据，以了解美国五个高温垃圾填埋场（ETLF）独特条件下的观测范围。主要气体比 CH：CO 的相关性显示了典型操作、（2）地下放热反应（SER）、（3）高含水量和（4）空气侵入的明显组成指标，这有助于操作人员和监管机构诊断各个气体提取井的情况。ETLFs A、B、D 和 E 表现出相似的趋势，例如 CH 减少和 CO、CO 和 H 增加，这些之前已经有过描述。ETLF C 由于用作替代每日覆盖物（ADC）的钢渣的碳酸化（即 CO 消耗），同时表现出升高的 CH 和温度。在最大气体井温度 T = 82°C/180 °F 时，CH 和 CO 浓度分别为 47%和 28%。在 ETLFs A、B 和 E，受影响的气体井中 H > 50% 已连续多年观察到。在五个 ETLFs 中，最大 CO 浓度范围从 1400-16,000 ppmv。与 CH：CO 的分析一样，这里假设 H（%）：CO（ppmv）可能推断出正在热降解的废物类型。工业废物和 MSW 的共处置以及潜在反应性 ADC 的使用，由于它们对 LFG 质量的潜在长期影响，应继续成为垃圾填埋场运营商和监管机构的重要考虑因素。
