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首页> 外文期刊>Journal of Environmental Management >Comparative study of ageing, heat treatment and accelerated carbonation for stabilization of municipal solid waste incineration bottom ash in view of reducing regulated heavy metal/metalloid laching
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Comparative study of ageing, heat treatment and accelerated carbonation for stabilization of municipal solid waste incineration bottom ash in view of reducing regulated heavy metal/metalloid laching

机译：考虑到减少规定的重金属/准金属的包埋，对老化，热处理和加速碳化以稳定城市垃圾焚烧底灰的比较研究

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This study compared the performance of four different approaches for stabilization of regulated heavy metal and metalloid leaching from municipal solid waste incineration bottom ash (MSWI-BA): (ⅰ) short term (three months) heap ageing, (ⅱ) heat treatment, (ⅲ) accelerated moist carbonation, and (ⅳ) accelerated pressurized slurry carbonation. Two distinct types of MSWI-BA were tested in this study: one originating from a moving-grate furnace incineration operation treating exclusively household refuse (sample B), and another originating from a fluid-bed furnace incineration operation that treats a mixture of household and light industrial wastes (sample F). The most abundant elements in the ashes were Si (20-27 wt.%) and Ca (16-19 wt.%), followed by significant quantities of Fe, Al, Na, S, K, Mg, Ti, and Cl. The main crystalline substances present in the fresh ashes were Quartz, Calcite, Apatite, Anhydrite and Gehlenite, while the amorphous fraction ranged from 56 to 73 wt.%. The leaching values of all samples were compared to the Flemish (NEN 7343) and the Walloon (DIN 38414) regulations from Belgium. Batch leaching of the fresh ashes at natural pH showed that seven elements exceeded at least one regulatory limit (Ba, Cr, Cu, Mo, Pb, Se and Zn), and that both ashes had excess basicity (pH ＞ 12). Accelerated carbonation achieved significant reduction in ash basicity (9.3-9.9); lower than ageing (10.5-12.2) and heat treatment (11.1-12.1). For sample B, there was little distinction between the leaching results of ageing and accelerated carbonation with respect to regulatory limits; however carbonation achieved comparatively lower leaching levels. Heat treatment was especially detrimental to the leaching of Cr. For sample F, ageing was ineffective and heat treatment had marginally better results, while accelerated carbonation delivered the most effective performance, with slurry carbonation meeting all DIN limits. Slurry carbonation was deemed the most effective treatment process, achieving consistently significant leaching stabilization, while also effectively washing out Cl ions, a requirement for the utilization of the ashes in construction applications. The benefits of carbonation were linked to the formation of significant quantities of Ca-carbonates, including appreciable quantities of the Aragonite polymorph formed in the slurry carbonated samples.
机译：这项研究比较了四种不同方法稳定从城市固体垃圾焚烧底灰（MSWI-BA）进行的重金属和准金属浸出的稳定性：（ⅰ）短期（三个月）堆肥老化，（ⅱ）热处理，（ ⅳ）加速湿碳酸化，和（ⅳ）加速加压淤浆碳酸化。在本研究中测试了两种不同类型的MSWI-BA：一种源自仅处理生活垃圾的移动式炉式焚化炉（样品B），另一种源自于处理家庭垃圾与混合气的流化床焚化炉。轻工业废物（样本F）。灰烬中含量最高的元素是Si（20-27重量％）和Ca（16-19重量％），其次是大量的Fe，Al，Na，S，K，Mg，Ti和Cl。新鲜骨灰中存在的主要结晶物质是石英，方解石，磷灰石，硬石膏和Ge石，而无定形部分的含量为56-73重量％。将所有样品的浸出值与比利时的佛兰德（NEN 7343）和瓦隆（DIN 38414）法规进行比较。在自然pH下分批浸出新鲜的灰烬表明，有7种元素超过了至少一个规定的限值（Ba，Cr，Cu，Mo，Pb，Se和Zn），并且两种灰烬的碱度都超标（pH＞ 12）。加速碳化使灰分碱度大大降低（9.3-9.9）；低于老化（10.5-12.2）和热处理（11.1-12.1）。就样品B而言，老化和加速碳酸化的浸出结果在调节极限方面几乎没有区别。然而，碳酸化的浸出水平相对较低。热处理特别不利于Cr的浸出。对于样品F，老化无效，热处理效果略好，而加速碳化则提供了最有效的性能，浆料碳化满足所有DIN限制。泥浆碳酸化被认为是最有效的处理过程，可实现始终如一的显着浸出稳定化，同时还可以有效清除Cl离子，这是在建筑应用中利用灰分的要求。碳酸化的好处与大量碳酸钙的形成有关，包括在碳酸钙矿浆样品中形成的大量文石多晶型物。

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