准好氧填埋场作业台阶表面CH_4气体的释放通量研究

Research on CH_4 Emission Fluxes from Active Terrace Surface of MSW Semi-aerobic Landfills

采用静态通量箱/气相色谱法对河北某准好氧填埋场不同填埋龄作业台阶表面CH4气体的释放通量进行了测定。结果表明,准好氧填埋场作业台阶表面CH4气体的释放通量存在较大差异,其最大值和最小值分别为215.51和0.13g/(m2.d)。各填埋作业区中越靠近导气管的区域CH4气体释放量越大,而相同填埋作业区上午、中午和下午释放的CH4气体通量差异相对较小,但呈下午>中午>上午的趋势。填埋龄为8,12,16和20个月的各填埋作业区中CH4气体的平均释放通量分别为4.79,21.15,81.04和7.44g/(m2.d),并随着填埋龄的增加呈先增加后降低的趋势,在填埋16个月左右达到其释放高峰。此外,准好氧填埋场不同填埋龄作业区表面的CH4气体释放通量随着距离导气管距离的增加呈指数函数递减。

Methane emission fluxes from active terrace surfaces of different landfilling age of a Municipal Solid Waster （MSW） semi-anaerobic landfill in Hebei Province were determined by the static chamber/gas chromatographic method. The results showed that significant differences were found among methane emission fluxes, with the maximum and the minimum being 215.51 and 0. 13 g/（ m^2·d）, respectively. The methane emission fluxes near the air pipe area were higher than the other areas, and the methane emission fluxes in the morning, noon and afternoon in the same area had small differences, and the emission order was afternoon 〉 noon 〉 morning. Moreover, the average methane fluxes in the areas with 8, 12, 16 and 20 months of landfilling age were 4. 79, 21.15, 81.04 and 7. 44 g/（m^2 .d）, respectively. The methane fluxes increased first and then decreased with the landfilling age and reached the maximum at the 16th month. In addition, methane fluxes from active terrace surfaces of different age areas decreased exponentially with increasing distances from the air pipe.