Pollution Assessment on Groundwater of an Informal Waste Landfill—Case Study of an Informal Waste Landfill in Certain District
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Abstract
Informal Waste Landfills in Certain City are numerous, and some of these are lack of anti-seepage control systems, which may lead to groundwater pollution caused by leachate. Considering conditions of the informal waste landfill in certain district, and the outcomes of investigation, reconnaissance, lab analysis and other related activities, the author investigated environmental geological conditions and the protective capability of stratum towards the waste pollutants, and evaluated the contamination status of the goundwater due to leachate within the first underlayer, and the effect on water quality of groundwater by Comprehensive Pollution Index and Nemerow Pollution Index evaluation methods. The result showed that contamination exsisted at different extent in all the groundwater samples flew through the downstream of the landfill. Moreover, the contamination extent positively correlated to the distance between the landfill and sampling site, that means groundwater contamination closely ties up with the landfill pollution. Accoding to the statistical results of the sample analysis, the highest pollution Index lies in arsenic, almost 24 times of the standard. And the subsequent pollution index lies in potassium permanganate, the highest resuilt reaches 2.4. Groundwater comprehensive pollution index is 5 times of the standard, and the Nemerow pollution index is 17 times of the standard value. Such groundwater contamination caused by the landfill has universality. It is representative, and reflected the groundwater pollution status in part of existed informal landfill in certain district. The pollution of this landfill provided the basis and experience for management and development of groundwater resources in certain district.
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