Study Of Monitoring The Change Of Polluted Area In Underground Aquifers Being Polluted By Leachate Of Landfill And Renovating Process With 3-D Electrical Method

Leakage of municipal landfill leachate is one of the major causes for the pollution of soil and underground water. Because after high-concentration and multi-component landfill leachate soak into underground, underground media's conductibility will change, electrical resistivity method is becoming an important means in investigating areas polluted by leachate and monitoring the process of pollution.In order to study effects of leachate invasion on electrical resistivity of underground media, and then confirm abnormal characteristics of electrical resistivity of areas in underground aquifers polluted by leachate, experiments of studying changes of electrical resistivity of saturated sand, unsaturated sand, loam soil and silt samples with increase of leachate content and concentration of different component of leachate are carried out first at this paper. On this base, a three-dimensional electro-monitoring system buried under the impermeable layer of landfill is specially devised according to the design feature of landfill. We use this system to monitoring the change of polluted area in underground aquifers polluted by leachate of landfill and renovating process in laboratory and filed. Experimental results indicate that the electrical resistivity of underground sandy aquifers will decrease because of leachate invasion, and that the amplitude of variation of electrical resistivity has a quantized correlativity with the degree of pollution. The diffusing process of leachate in the aquifer behaves as the dynamic change of low-resistivity abnormal zone on electrical resistivity sections obtained in different periods of time. Pollution level, diffusing velocity and direction can be known from contrast analysis of such a change. The renovating process behaves as the increase of apparent electrical resistivity and change of abnormal characteristics distribution on electrical resistivity sections with the...