我国高厨余垃圾填埋场渗滤液高效导排方法与实践  

Method and Practice of Efficient Drainage of Leachate from Landfill with High Kitchen Waste in China

作　　者：刘赛赛 张玉飞 叶剑 张楠 李耀晃 贺东旭 兰吉武[1,4] LIU Saisai;ZHANG Yufei;YE Jian;ZHANG Nan;LI Yaohuang;HE Dongxu;LAN Jiwu(Institute of Geotechnical Engineering,Zhejiang University,Hangzhou Zhejiang430010;Guangzhou Grandtop Environmental Service Co.Ltd.,Guangzhou Guangdong510000;The Architectural Design&Research Institute of Zhejiang University Co.Ltd.,Hangzhou Zhejiang311121;MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering,Zhejiang University,Hangzhou Zhejiang 310058)

机构地区：[1]浙江大学岩土工程研究所,浙江杭州430010 [2]广州环投环境服务有限公司,广东广州510000 [3]浙江大学建筑设计研究院有限公司,浙江杭州311121 [4]浙江大学软弱土与环境土工教育部重点实验室,浙江杭州310058

出　　处：《环境卫生工程》2024年第S01期121-127,共7页Environmental Sanitation Engineering

基　　金：浙江省“领雁”研发攻关计划项目(2022C03095);国家自然科学基金项目(51988101、52370152);广东省住房和城乡建设厅科技创新计划项目(2021-K33-381539)。

摘　　要：针对高厨余垃圾填埋后带来的渗滤液产生量高、导排不及时、液位壅高和堆体失稳等问题,提出了渗滤液高效导排设计方法。合理计算渗滤液产生量,对运行中的填埋场需同时监测堆体液位,开展稳定验算确定液位控制目标和对应的渗滤液目标导排量,匹配大口径抽排竖井、边坡水平导排长盲沟、坡脚短盲沟等导排设施,并应用于广州兴丰垃圾填埋场,设计采用大口径抽排竖井144口、边坡水平导排长盲沟185条、坡脚短盲沟40条,以实现45 d内104940 m3渗滤液的目标导排量和液位下降3.0 m的液位控制目标。降水工程实施后,堆体主液位在3个月下降约6.3 m,南坡主液位40 d内下降约1.0~3.0 m、10个月内下降约1.0~6.0 m。顶部剪出滑坡模式安全系数增加了0.2,达到1.0的临界稳定状态;整体滑坡模式安全系数增加了0.4,达到1.6以上,满足CJJ 176—2012生活垃圾卫生填埋场岩土工程技术规范要求。Aiming at the issues of high leachate yield,inadequate drainage,liquid level buildup,and pile instability caused by high kitchen waste landfill,an efficient leachate drainage design method was proposed.This method involves calculating leachate yield accurately and monitoring the liquid level of the pile in operating landfills.Stability calculations were conducted to determine the liquid level control target and the corresponding targeted leachate drainage volume,matching large-diameter pumping shafts,long horizontal drainage blind trenches along the slope,and short blind trenches at the foot of the slope.This approach was applied to the Xingfeng landfill site in Guangzhou.A design was implemented using 144 large-diameter pumping shafts,185 long horizontal drainage blind trenches along the slope,and 40 short blind trenches at the foot of the slope,aiming for a targeted leachate drainage volume of 104940 m³within 45 days and a liquid level reduction target of 3.0 meters.After the implementation of the drainage project,the main liquid level at the top of the pile decreased by approximately 6.3 m over three months.On the south slope,the main liquid level decreased by about 1.0 meter to 3.0 meters within 40 days and by about 1.0 meter to 6.0 meters over ten months.The safety factor of top-cut sliding failure mode increased by 0.2,reaching a critical stable state of 1.0,and the overall stability safety factor increased by 0.4,exceeding 1.6,satisfying the regulatory requirement of CJJ 176—2012 Technical Code for Geotechnical Engineering of Municipal Solid Waste Sanitary Landfill.

关 键 词：高厨余垃圾 渗滤液液位 目标导排量 高效导排 

分 类 号：X799.3[环境科学与工程—环境工程] X703