摘要
为优化危险废物填埋场地下水污染风险控制的工程/地质屏障参数,基于过程模型模拟-参数敏感性分析-参数优选的系统框架和方法,分析关键参数对于地下水中渗滤液所携带污染物浓度的影响和敏感性,基于分析结果推荐技术参数的取值区间和最低的技术参数要求.结果表明:①各参数对地下水污染风险的敏感性排序依次为导排支管间距>含水层厚度>导排层坡度>天然衬层渗透系数>导排层渗透系数>地下水流速.②当导排支管间距>25 m、导排层坡度<2%、导排层渗透系数<0.0001 cm/s、天然衬层渗透系数>1×10^-6 cm/s时,地下水污染风险急剧增大;反之,当导排支管间距<10 m、导排层坡度>3%、导排层渗透系数>0.01 cm/s、天然衬层渗透系数<5×10^-7 cm/s时,对地下水污染风险的管控并无明显影响.③导排支管间距最低为25 m,但不宜<10 m,导排层坡度最低为2%,但不宜>3%,导排层渗透系数最低为0.01 cm/s,天然衬层渗透系数最低为1.0×10^-6 cm/s.研究显示,现有标准中给出的参数取值具有合理性,但范围较广,应结合水文地质参数与填埋场参数确定.
In order to optimize the engineering/geological barrier parameters of groundwater pollution risk control in hazardous waste landfill,based on the system framework and method of process model simulation,parameter sensitivity analysis and parameter optimization,the influence and sensitivity of key parameters on the concentration of pollutants carried by groundwater percolate are analyzed,and the value range and minimum technical parameter requirements are recommended based on the analysis results.The results show that:(1)The order of sensitivity of each parameter to groundwater pollution risk is the spacing of diversion branch pipe>the thickness of aquifer>the gradient of diversion layer>the permeability coefficient of natural liner>the permeability coefficient of diversion layer>the velocity of groundwater flow.(2)The risk increases sharply when the distance between the guide and drainage branches is more than 25 m,the slope of the guide and drainage layer is less than 2%,the permeability coefficient of the guide and drainage layer is less than 0.0001 cm/s,and the permeability coefficient of the natural liner is more than 1×10^-6 cm/s.On the contrary,when the spacing between branch pipes is less than 10 m,the gradient of guide bed is more than 3%,the permeability coefficient of guide bed is more than 0.01 cm/s,and the permeability coefficient of natural liner is less than 5×10^-7 cm/s,the risk control has no obvious influence.(3)The spacing between branch pipes is the lowest 25 m,but it is not suitable to be less than 10 m,and the gradient of guide layer is the lowest 2%,but not more than 3%;the permeability coefficient of guide layer is the lowest 0.01 cm/s;and the permeability coefficient of natural liner is the lowest 1.0×10^-6 cm/s.The research shows that the parameters given in the existing standards are reasonable,but the range is wide.It should be determined with hydrogeological parameters and landfill parameters.
作者
向锐
徐亚
刘景财
刘玉强
董路
雷国元
黄启飞
XIANG Rui;XU Ya;LIU Jingcai;LIU Yuqiang;DONG Lu;LEI Guoyuan;HUANG Qifei(State Key Laboratory of Environmental Benchmarks and Risk Assessment,Chinese Research Academy of Environmental Sciences,Beijing 100012,China;Institute of Solid Waste Pollution Control Technology,Chinese Research Academy of Environment Sciences,Beijing 100012,China;Wuhan University of Science and Technology,Wuhan 430081,China)
出处
《环境科学研究》
EI
CAS
CSCD
北大核心
2020年第3期643-651,共9页
Research of Environmental Sciences
基金
国家重点研发计划项目（No.2018YFC1800902）
国家自然科学基金项目（No.51708529)~~
关键词
填埋场选址
填埋场设计
过程模拟
敏感性分析
landfill site selection
landfill design
process simulation
sensitivity analysis
作者简介
向锐(1994-),男,湖北宜昌人,15671554758@163.com;责任作者:刘玉强(1975-),男,安徽蚌埠人,副研究员,主要从事固废处置及其污染控制研究,liuyq@craes.org.cn.
