南水北调工程北京市受水区非正规垃圾填埋场控高水位研究

摘要

近年来北京市平原区地下水污染范围已呈现从城区向郊区延伸、从浅层向深层扩散的趋势.地下水污染源调查评价研究表明,垃圾填埋堆放场是造成地下水污染的主要污染源之一.以北京市南水北调工程受水区内存在被浸泡可能的27个非正规垃圾填埋场为研究对象,在垃圾填埋场基本特征的基础上,对典型非正规垃圾填埋场进行水文地质勘察和水、土、垃圾样的分析化验,建立北京西郊地下水流模型和典型区溶质运移模型,初步掌握污染因子间的协同关系和污染物的迁移规律,应用非饱和带一维非稳定溶质运移模型,确定南水北调工程受水区垃圾填埋场区域地下水控高水位,并优选了适宜的控高方案,以减轻和防止垃圾填埋场淋滤浸泡液对当地地下水的污染.%In recent years, groundwater pollution bound had presented trend from the urban to suburb, from shallow aquifer to deep aquifer.The results from investigating and evaluating groundwater pollutant sources indicated that waste landfill was one of main pollutant sources.Aimed at the area in 27 typical non-sanitary municipal solid waste landfill in the Benefited Regions of SNWDP (the South-North Water Transfer), a groundwater and solute transport model was established on the basis of finding the characteristics of waste landfill, carrying hydrogeological investigation and analysis of water sample, soil sample and waste sample of the waste landfill.According to the simulation results, the relationship between the pollution factors and transportation law of the pollutants were mastered.This study also confirmed control groundwater level of typical non-sanitary municipal solid waste landfill in Beijing in the Benefited Regions of SNWDP by using one-dimension unsteady solute transport model in unsaturated soil.The optimized scheme controlling groundwater level in order to mitigate and prevent the groundwater pollution by waste landfill leachate was brought out.