중심극한정리와 t-검정을 적용한 매립장 표면발산 측정의 적정성 평가

To evaluate the reliability of the results of landfill gas surface emission measurement and the appropriateness of the number of measurement points, an analysis was performed for the Second Landfill Site in Sudokwon Landfill by applying the central limit theorem and t-test. In the flux of the three surface emission paths, the relative deviation of methane was much larger than the deviation of landfill gas. By season, in both cases, the upper part of the summer season had the largest values, 409% and 1,174%, respectively. The relative error in overall methane values was also large, and among the four-season average values, the summer methane value was largest at 182.7% and the spring and winter values of landfill gas were smallest at approximately 33.0%. When a relative error of 20% was allowed, the number of site measurement points was universally smaller than 100% compared to the appropriate number, and methane was very low. In the case of the upper part with the largest surface emission, the level of satisfaction with the number of measurement points from spring to winter was only 26.1%, 9.8%, 17.9%, and 22.6%, respectively, and the methane values were only 2.7%, 1.2%, 5.9%, and 3.2%, respectively. As a result of the study, when investigating the surface emission of the landfill gas it was judged that research on alternative monitoring methodologies were necessary because the current chamber method has limitations in securing reliability.