The significance to monitor gas composition in observation wells at waste landfills

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  • 廃棄物最終処分場における観測井内ガス組成のモニタリング意義

Abstract

<p>When the landfill gas is investigated for maintenance and/or the abolition of landfill, the vertical observation well with the pipe which perforated entire depth of waste layer is often installed. But, the gas composition in the well of each depth may differ due to various factors. In this study, the gas compositions around the observation wells were investigated at multiple depth using a self-made sealing device called air packer. The composition of gas in each depth of the pipe was similar with the integrated gas composition of deeper layer than target depth. This suggests that the composition of the gas at a depth in the pipe not affected by the air infiltrated from the top of the well can represent the landfill gas was fluxed from the whole waste layers. Incidentally, when an air packer was used in an observation well near the retaining wall made from soil, if the suction power of the blower was strong, there was a possibility of sucking ambient air from the slope through the waste layer with high air permeability.</p>

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