Department of Environmental Engineering, National Chung Hsing University, 250 Kuo Kuang Rd., Taichung 402, Taiwan.
J Environ Manage. 2012 Aug 15;104:67-76. doi: 10.1016/j.jenvman.2012.03.008. Epub 2012 Apr 5.
Approximately 19.2% of Taiwan's municipal solid waste (MSW) that passes through incineration disposal is converted into ashes (including bottom ash and fly ash). Although bottom ash can pass nearly all of the standards of the toxicity characteristic leaching procedure (TCLP), its high chloride content makes its reuse limited; it generally cannot be used as a fine aggregate material in concrete applications. This research examined washing four types of bottom ash (BA) and fly ash (FA) with water to reduce their chloride content. The optimal water intensity for washing pretreated bottom ash was found to be 7-8L of water per kg of bottom ash, and the optimal water intensity for washing untreated fly ash was found to be 20-25 L of water per kg of fly ash. Based on regression analyses of the chloride concentrations of the leachates and their electrical conductivity (EC) values, each MSW incineration plant has its own ash characteristics as well as a specific regression line in bottom or fly ash leachate. Clearly, it is possible to monitor the EC values of the leachates online by estimation from regression equations to determine the chloride concentrations in the leachates.
台湾市生活垃圾（MSW）经焚烧处理后，约有 19.2%转化为灰烬（包括底灰和飞灰）。尽管底灰几乎可以通过毒性特征浸出程序（TCLP）的所有标准，但由于其高氯含量，其再利用受到限制；通常不能将其用作混凝土应用中的细骨料材料。本研究考察了用水洗涤四种类型的底灰（BA）和飞灰（FA）以降低其氯含量。发现预处理底灰的最佳水洗水强度为每公斤底灰 7-8L，未处理飞灰的最佳水洗水强度为每公斤飞灰 20-25L。基于浸出液中氯浓度及其电导率（EC）值的回归分析，每个垃圾焚烧厂都有其自身的灰分特性，以及在底灰或飞灰浸出液中具有特定的回归线。显然，可以通过从回归方程进行在线估计来监测浸出液的 EC 值，以确定浸出液中的氯浓度。
