Abstract：
ABSTRACTThe Ministry of Environment of Korea has proposed a ban on landfill disposal of municipal solid waste (MSW) from 2026. Thus, it is inferred that the amount of incineration ash will increase drastically. Against this backdrop, this study assessed the applicability of a plasma melting process to fly ash. Fly ash was collected from 14 incineration facilities to analyze its basic properties and perform melting experiments. Furthermore, scanning electron microscope (SEM) analysis and economic feasibility assessment were conducted. The molten fly ash slag exhibited a pH value of 9.9, and the ignition loss of fly ash was found to range from 14.5 to 25.7 wt.%. None of seven toxic elements (arsenic (As), cadmium (Cd), cyanide (CN), mercury (Hg), hexavalent chromium (Cr(VI)), copper, and lead (Pb)) was detected from the molten slag. In addition, 99.3 wt.% of chloride ion (Cl-), 97.9 wt.% of fluoride ion (F-), and 98.1 wt.% of sulphate ion (SO42-) were removed. The contents in the molten slag were found to be 0.19, 7.8, 27.8, 33.1, and 38 mg/kg for Cd, Pb, zinc, nickel, and F, respectively, and none of CN, Hg, and As was detected, thereby meeting the criteria for soil pollution. All of the environmental standards were met, and SEM analysis confirmed stable quality with high density and no surface pore. In the economic feasibility assessment, a profit of approximately 152.4 $/ton was also estimated compared to landfill disposal.
摘要：
摘要韩国环境部提议从2026年起禁止垃圾填埋处理城市固体废物。因此，据推测，焚烧灰的数量将急剧增加。在这种背景下,这项研究评估了等离子体熔化工艺对粉煤灰的适用性。从14个焚烧设施中收集了飞灰，以分析其基本特性并进行熔融实验。此外，进行了扫描电镜(SEM)分析和经济可行性评价。熔融粉煤灰炉渣的pH值为9.9,发现粉煤灰的灼烧损失为14.5至25.7wt。%.七种有毒元素(砷(As)，镉(Cd),氰化物(CN),汞(Hg),六价铬（Cr（VI）），铜，从熔渣中检测到铅（Pb）。此外,99.3wt。%的氯离子(Cl-)，97.9wt。%氟离子(F-)，和98.1wt。去除%的硫酸根离子(SO42-)。发现熔渣中Cd的含量为0.19、7.8、27.8、33.1和38mg/kg，Pb,锌，镍,F,分别,没有CN,Hg,正如检测到的那样，从而达到土壤污染的标准。所有的环境标准都达到了，和SEM分析证实质量稳定，密度高，没有表面孔。在经济可行性评估中,与堆填区处置相比，估计利润约为152.4美元/吨。
