高渗滤液水位填埋场的填埋气高效收集探究  

Exploration on efficient collection of landfill gas in a landfill with a high leachate level

作　　者：高武[1] 詹良通[1] 兰吉武[1] 陈云敏[1] 张海华 郑学娟 GAO Wu;ZHAN Liang-tong;LAN Ji-wu;CHEN Yun-min;ZHANG Hai-hua;ZHENG Xue-juan

机构地区：[1]浙江大学岩土工程研究所,软弱土与环境土工教育部重点实验室,浙江杭州310058 [2]杭州市环境集团有限公司,浙江杭州310022

出　　处：《中国环境科学》2017年第4期1434-1441,共8页China Environmental Science

基　　金：国家重点基础研究发展计划(973计划)(2012CB719806)

摘　　要：在我国南方湿润气候区某高渗滤液水位填埋场开展现场抽气试验,测试了不同的水位埋深、试验井数量和井头负压条件抽气量,评估了该填埋场的填埋气资源化利用情况.固废堆体中的初始渗沥液水位平均埋深约3m,该水位下的填埋气收集率不足30%;不同井头负压和水位条件下竖井的抽气影响范围为8.85~30.53m;该填埋场固废的平均产气潜カ为143.69L/kg,平均产气速率为0.173a^(-1).此外通过调査现场竖井的渗滤液导排情况,掲示了用于降水的空气压缩机和竖井周边固废的渗透系数是影响竖井渗滤液导排效果的主要因素.结合抽气试验和现场调査,提出了提高填埋气收集量的工程措施,通过增设66ロ抽水竖井降低堆体中渗滤液水位,该填埋场的填埋气收集量由2240m^3/h提高至5900m^3/h.Landfill gas(LFG)extraction tests were carried out at a wet landfill of municipal solid waste(MSW)in Southern China.The influences from leachate level,well number and vacuum pressures on the LFG extraction rate were investigated.The efficiency of LFG collection and recovery at this kind of landfill was evaluated.It was found that the LFG collection efficiency was less than30%when the average buried depth of leachate level was about3m in the landfill.The influence radius of extraction wells ranged from8.85~30.53m under different vacuum pressures and leachate levels.The average LFG generation potential of MSW at this landfill was143.69L/kg,and the average LFG generation rate of MSW was0.173a-1.In addition,field investigation indicated that the compressed air pressure for leachate pumping and the permeability around the vertical well were the main influence factors on the leachate drainage performance of pumping wells.On the base of the LFG extraction tests and the field investigation,practical measures were proposed to enhance the LFG collection rate at landfills with a high leachate level.The LFG collection rate at this landfill was increased from2240m3/h to5900m3/h after extra66pumping wells were put into use to drawdown the leachate level.

关 键 词：固体废弃物 填埋场 渗滤液水位 抽气试验 产气潜力 降水 

分 类 号：X705[环境科学与工程—环境工程]