This study evaluated the efficacy of two compost materials, yard waste and leaf compost (YWLC) and biosolids compost (BSC), as bio-based landfill cover materials for oxidizing methane (CH₄). A series of laboratory batch incubations were conducted to assess the CH₄ oxidation potential of the composts and potential enhancement of CH₄ oxidation under different conditions. Higher initial rates of CH₄ oxidation were yielded in a sample of YWLC cured beyond the maturity standard at the compost site due to a reduction in raBOD and subsequent reduction in heterotrophic competition for oxygen. Results showed that the YWLC already had methanotrophic bacteria within the compost community with an initial CH₄ oxidation rate of up to 95.9 µmol g(d.w.)^-1 d^-1. An optimum moisture content (MC) of 65% and 50% ww was obtained for YWLC with CH₄ oxidation rates of up to 175-180 µmol g(d.w.)^-1 d^-1. In an assessment of long-term CH₄ oxidation rates, a sample of BSC showed a long lag (60 days) to start consuming CH₄; however, after this lag, it reached a CH₄ oxidation rate of 160-170 μmol g(d.w.)^-1 d^-1, which was similar to that of the YWLC (130-140 μmol g(d.w.)^-1 d^-1) at the end of the 100 day experiment. While very little initial CH₄ removal was detected in the BSC, different blends of BSC with YWLC were found to enhance CH₄ oxidation indicating that there was a benefit to mixing the two composts. The highest long-term CH₄ oxidation rates were observed in 1:1 and 1:4 (YWLC:BSC) mixing ratios (360-380 µmol g(d.w.)^-1 d^-1). Neither the in-situ MC, heavy metals concentrations, nutrient content, nor the in-situ population of methanotrophs were determined to be limiting variables for CH₄ oxidation start-up in the BSC.

这项研究评估了两种堆肥材料（院子废料和叶堆肥（YWLC）和生物固体堆肥（BSC））作为氧化甲烷（CH ₄）的生物基垃圾掩埋材料的功效。进行了一系列实验室分批培养，以评估堆肥的CH ₄氧化电位和在不同条件下CH ₄氧化的电位增强。由于raBOD的减少以及随后异养对氧竞争的减少，在堆肥位点固化的YWLC样品中超过了成熟标准的CHW样品，产生了更高的CH ₄氧化初始速率。结果表明，YWLC堆肥区内已存在甲烷营养细菌，初始CH ₄氧化速率高达95.9 µmol g（dw）^-1 d ^-1。对于YWLC，CH ₄氧化速率高达175-180 µmol g（dw）^-1 d ^-1的最佳水分含量（MC）为65％和50％ww 。在评估长期的CH ₄氧化速率时，BSC样品显示开始消耗CH ₄的时间很长（60天）。但是，在此滞后之后，它的CH ₄氧化速率达到了160-170μmolg（dw）^-1 d ^-1，与YWLC相似（130-140μmolg（dw）^-1 d ^-1）在100天实验结束时进行。虽然初始CH很少在BSC中检测到₄去除，发现BSC与YWLC的不同掺混物可增强CH ₄氧化，表明混合两种堆肥有好处。在1：1和1：4（YWLC：BSC）混合比（360-380 µmol g（dw）^-1 d ^-1）下，观察到最高的长期CH ₄氧化速率。无论是原位MC，重金属浓度，营养成分还是甲烷营养菌的原位种群都没有被确定为BSC中CH ₄氧化启动的限制变量。