生活垃圾填埋场甲烷排放规律的短期监测

为了解国内生活垃圾填埋场封场后的甲烷排放规律及其影响因素,以静态箱法测试了杭州市天子岭卫生填埋场封场后的甲烷排放情况.24h周期内,2个测试点甲烷排放速率均值的变化范围为3.67～36.65 mmo·l(m²·h)^-1.2个测试点甲烷排放速率的最大比值为625,其差异可以根据覆土层厚度的不同得到解释.单点甲烷排放速率显示与大气压强和覆土层含水率的相关性,逐次回归结果分别为r²=0.89(测试点1)和r²

Short-Term Monitoring of Methane Emission Regulation from a Municipal Solid Waste Landfill

To understand the regulation and influencing factors of methane emission from landfills in China,rates of methane emission from Hangzhou Tianziling municipal solid waste landfill were measured by static chamber technique.The emission rates ranged from 3.67 to 36.65 mmol·(m²·h)^-1 on average of the two tested points(No.1 and No.2) during 24-hour cycle.The max ratio of emission rates between the two tested points was 625.The difference with the rates of the two tested points could be explained by the depth of the cover soils.Rate of methane emission from each point correlated with atmospheric pressure and water content of landfill cover soils,and the result from stepwise regression was r²=0.89 for point No.1,r²=0.76 for point No.2.Rates of methane emission varied from-0.23 to 0.32 mmol·(m²·h)^-1 on average in 40-day test(points with same depth of cover soils).The low correlation(r²=0.15) with atmospheric pressure showed that atmospheric pressure was not the decisive factor.For some time,emission rates correlated with water content or temperature of the landfill cover soils significantly,but not obvious(r²<0.4) during the whole monitoring time.When atmospheric pressure was included,the results of stepwise regression were improved significantly,which showed that methane emission rates were influenced by different factors,but the effect of each factor was not the same at a different time.