Journal of Food, Agriculture and Environment

Principle of leakage detection for landfills with double geomembrane liners

Author(s):

Shaopeng Guan ^{1, 2}*, Yuling Wang ^{1, 2}, Changxin Nai ³, Wenyan Sun ^{1, 2}

Recieved Date: 2013-07-13, Accepted Date: 2013-09-12

Abstract:

Impermeable geomembrane liners are requisites in landfill construction in order to protect environment, which form a barrier between the waste leachate and the groundwater. Especially in hazardous waste landfills, double geomembrane liners are often used. During the installation, many construction quality assurance (CQA) programmes such as non-destructive testing methods or electrical methods guarantee the quality of geomembrane welding and installation. However, in the operation of the landfill, garbage trucks and geological subsidence are also liable to break geomembrane liners. Leakage detection technologies are also needed in the landfill operation. We put forward a real-time leakage detection scheme for double-lined landfills based on electrical methods. In the scheme, some detecting electrodes are placed in a grid in the isolation layer (detection layer) between the two geomembrane liners. The upper and lower geomembrane liners are tested simultaneously by collecting and analysing the electric potentials in the detection layer. We establish the detection model for the scheme, derive the electric potential equation. It can be seen from the equation that the electric potential distribution is affected by the thickness and resistivity of the detection layer. The detection sensitivity lowers as the thickness of the detection layer increases. To the contrary, the detection sensitivity increases as the resistivity of the detection layer increases with the same source current. In addition, the source current has impact on the electrical distribution aroused by the current flowing through the leak. Then, the source electrode should be placed as far as possible from the detection area. At last, we conduct experiments to verify the feasibility of the scheme.

Keywords:

Double-lined landfill, leakage detection, geomembrane liner, electrical method, hazardous waste

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Journal: Journal of Food, Agriculture and Environment
Year: 2013
Volume: 11
Issue: 3&4
Category: Environment
Pages: 2054-2058

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