生物炭改性填埋场覆盖粉土的甲烷氧化能力试验研究

试验采用一种填埋场覆盖粉土作为土料,分别以木屑和水稻秸秆为原料热解的生物炭作为土料的改良剂,通过30天的甲烷氧化培养瓶试验研究了粉土以及两种不同生物炭改性土的甲烷氧化能力,同时研究了土样含水率对其甲烷氧化能力的影响。试验结果表明：两种生物炭均能提高粉土的甲烷氧化能力2.5倍左右。试验中所有土样在含水率在10%时几乎没有甲烷氧化能力,粉土以及两种生物炭改性土的甲烷氧化适宜含水率范围也各不相同,掺入生物炭能够增大粉土的甲烷氧化适宜含水率范围；本文运用击实曲线估计了试验中土样的水气双开敞(即水气都连通)条件的含水率范围,其结果表明：土样的水气双开敞条件含水率界限差值越大,土样的甲烷氧化适宜含水率界限差值也越大。掺入生物炭增大了粉土土样的水气双开敞条件的含水率范围,因此增大了其甲烷氧化适宜含水率范围。

Methane oxidation capacity of landfill cover biochar amended silt

Silt as landfill cover soil and two kinds of biochar as soil amendment, respectively woodchip biochar and rice straw biochar, were used in this study. Batch test with duration up to 30 days were carried out on silt and biochar amended silt samples to measure their methane oxidation capacity. The influence of moisture content on methane oxidation was also investigated. The experiments demonstrated that all biochars increased the silt methane oxidation capacity 2.5 times or so. All soil samples were barely methane oxidation when moisture content is 10%. The optimum moisture content range for methane oxidation of the silt and different biochar amended silt was different, all biochars increased the optimum moisture content range for methane oxidation of the silt. The moisture content range for double open of soils were predicted by compaction curve in this study, the predicted results showed that the moisture content range for double open of soils was more widely ,while the optimum moisture content range for methane oxidation of soils as more widely. Biochars increased the moisture content range for double open of the silt, so that increased the optimum moisture content range for methane oxidation of the silt.