垃圾土降解过程中孔隙气压变化试验研究  

Experimental Study on Pore Gas Pressure Change During Degradation of Solid Waste

作　　者：李玉林 周亚吉 LI Yulin;ZHOU Yaji(Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering,Hohai University,Nanjing 210098,China)

机构地区：[1]河海大学岩土力学与堤坝工程教育部重点实验室,江苏南京210098

出　　处：《粉煤灰综合利用》2020年第2期113-116,140,共5页Fly Ash Comprehensive Utilization

基　　金：国家自然科学基金项目(重点项目41510637)。

摘　　要：采用人工配制的垃圾样进行降解试验,试验过程中监测试样内部孔隙气压、产气速率、产气量的变化。试验结果表明:试样内部的孔隙气压在很短时间内达到最大值,之后气体逸散导致气压快速降低,且距离反应器边缘越近,气压越小。孔隙气压随着埋深的增大而增大,试验中气压传感器测得的孔隙气压最大值为167Pa。垃圾土降解产气速率存在二次峰值现象,第一次峰值在第1d出现,产气速率为299.784 L/d,第二次峰值在第20d出现,产气速率为6.016L/d,试验过程中总产气量为497.372L。Artificial sample was used to carry out the degradation test of waste,and the changes of pore gas pressure,gas production rate and gas production were monitored during the test.The results showed that the pore gas pressure in the waste reached to the maximum in a very short time,and then the gas escaped,which leads to a rapid reduction of the pressure.The closer to the edge of the reactor,the lower the pressure.The pore gas pressure increased with that of the depth.The maximum pore pressure measured by the gas pressure sensor in the test was 167Pa.There was a second peak phenomenon in the gas production rate measured by the experiment.The first peak appeared on the first day and the gas production rate was 299.784L/d.The second peak appeared on the twentieth day and the gas production rate was 6.016L/d.The total gas production was 497.372L.

关 键 词：垃圾土 降解 产气 孔隙气压 

分 类 号：X705[环境科学与工程—环境工程]