야적 폐기물의 자연발화 기작 및 관리방안(I) = Management and Mechanisms of Spontaneous Ignition in Waste Pile (I)

다국어 초록 (Multilingual Abstract)

Spontaneous ignition of waste piles has been and continues to be a challenge in waste treatment. Spontaneous ignitions can pose a great threat to the safety of the surrounding environment and to human health. Thus, understanding the parameters that control spontaneous ignition is necessary to help predict and potentially mitigate these hazards. The objective of this study was to identify the mechanism of spontaneous ignition in waste piles. Two types of combustion can develop in waste piles: surface combustion, which is generally an occurrence of flaming combustion, and subsurface fires, which are generally occurrences of smoldering combustion. Smoldering combustion is a slow, low temperature, flameless form of combustion, and is self-sustained. Smoldering combustion can be continuously produced and it can change to flaming combustion if the air supply is not eliminated. Smoldering combustion also releases significant quantities of pollutants such as carbon monoxide. In order to extinguish these combustions effectively and cheaply, more parameters of the waste pile should be obtained, such as the temperature field and gas composition. Drilling holes at suspicious waste pile combustion areas can confirm whether these places are high-temperature areas or not. A carbon monoxide concentration of 1,000 ppmv can be utilized as an indicator of smoldering combustion. In addition, water in an amount ranging between 6.22 and 11.66 kg will be required at 25℃ to extinguish the heat produced by the flaming combustion of 1 kg of waste.

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