A Numerical Model for Error Analyses of Static Chamber Method Used at Landfill Site
Static chamber method is widely used to measure emission of landfill gas by deploying the chamber at the surface of landfill cover soil. However, there will be errors between the measured fluxes and the real fluxes due to the increase of gas pressure in the chamber. A numerical model based on dust gas model was developed to investigate the factors affecting the errors. It is found that, height of static chamber is the most sensitive factor. When the height of chamber increases from 0.12 to 0.5 m, the error decreases from 32% to 10%. It will be easier for the chambers of smaller sizes to accumulate higher concentration and lead to greater errors. The proposed numerical model was successfully used in the analysis of the field static chamber tests carried out at the Xi’an landfill site. The evaluated errors for the field tests can be 30%. The model would be very useful for the error assessment of the static chamber tests.
KeywordsStatic chamber Multi-component landfill gas Cover soil
The financial supports from the National Natural Science Foundation of China (Grants Nos. 41672288, 51478427, 51625805, 51278452, and 51008274), and the Fundamental Research Funds for the Central Universities (Grant No. 2017QNA4028) are gratefully acknowledged.
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