Comparative Study of Sampling and Measurement Methods for the Development of CH₄ Emission Factors at MSW Incinerators

Lung samplers (periodic sampling) have generally been used to develop CH₄ emission factors in waste incineration facilities. Since this method must be calculated using only the value at a specific point in time, it may not reflect the emission characteristics depending on the circumstances of the facility. In order to supplement this method, a method of continuously collecting samples for a long period of time or continuously measuring may be used. In this study, the CH₄ emission factor development and titration methodology were reviewed using both the existing methods and the newly proposed continuous sampling and continuous measurement methods. As a result of the analysis, the average emission factor by periodic sampling was 0.201 gCH₄/ton-waste, the average emission factor by continuous capture was 0.199 gCH₄/ton-waste, and the average emission factor by continuous measurement was 0.176 gCH₄/ton-waste. There was a difference of 0.025 gCH₄/ton-waste in the emission factor values by periodic sampling and continuous measurement, and the emission factor values for periodic sampling and continuous sampling were similar. There was no statistically significant difference, confirming that all three methods could be used. However, the existing method, periodic sampling, cannot reflect the characteristics of the night, and, in the case of continuous measurement, expensive equipment and maintenance are difficult. Therefore, it is judged that the method using continuous sampling is a good method that can combine the two advantages.