关于城市垃圾堆放的环境水文地质问题

ON ENVIRONMENTAL HYDROGEOLOGY OF LANDFILL

随着人口增加,工业发达和物质文明的进步,城市地区已成为环境地质研究的重点地区。城市环境地质研究所涉及的方面很多,如城市用水管理,土地规划利用,天然和人为工程设施所引起的灾害地质的防治,工业“三废”和城市垃圾的处理和排放等等,均属城市发展中的环境地质问题。

As a result of our consumptive and industrial way of mankind's life,munic-ipal refuse must be properly managed in a good state,: otherwise it will uglify the municipal esthetics,pollute the urban environment and break the ecological, balance.The most common means of 'managing' municipal refuse is by deposition in sanitary landfills.In humid and semi-humid regionsi as time goes on,infiltration through landfill normally results in the migration of leachate from the refuse into the underlying groundwater zone, and that will seriously induce water quality degradation in aquifers.Selecting suitable sites for refuse deposition,predicting the hazardous degree resulting from refuse disposal and making the means of refuse-treated must be conducted in cities.This paper describes the hydrogeological framework for investigation which includes physiographyiclimatology.geology and groundwater hydrology.The introduction of monitoring devices and chemical analyses are used to obtain the date upon which this paper is based.Hydrogeochemical studies of groundwater contamination by landfill leachate are described in this paper.Leaching or dissolution of the readily solubilized constituents in the refuse, decomposition of organic matter,redox reactions [and cation-exchange processes, are usually dominant influences on the contaminated groundwater at landfills.The organic and inorganic chemical processes exist mutually in the refuse or beneath it.Many reactions are interrelated. Successful analyses of hydrogeo-chemistry will be achieved under the analyses of constituents of refuse and local hydrogeological conditions.Finally,this paper discusses a natural advection test and mathematical models that can be used-to describe the spatial distribution of dispersion in a contaminated groundwater system and to [determine the dispersivities in three dimensional directions of heterogeneous aquifers.