• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文OA文献 >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 leaching
【2h】

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 leaching

机译：考虑到减少规定的重金属/准金属的浸出，通过老化，热处理和加速碳化来稳定城市垃圾焚烧底灰的比较研究

代理获取
本网站仅为用户提供外文OA文献查询和代理获取服务，本网站没有原文。下单后我们将采用程序或人工为您竭诚获取高质量的原文，但由于OA文献来源多样且变更频繁，仍可能出现获取不到、文献不完整或与标题不符等情况，如果获取不到我们将提供退款服务。请知悉。
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

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 to 27 wt.%) and Ca (16 to 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废物焚烧底灰（MSWI-BA）进行的受管制重金属和准金属浸出的性能：（i）短期（三个月）堆龄，（ii）热处理，（ iii）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窑焚化操作（样品B），另一种源自处理家庭垃圾与混合气的流化床焚烧过程。轻工业废物（样本F）。灰烬中含量最高的元素是Si（20至27重量％）和Ca（16至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监管限值（Ba，Cr，Cu，Mo，Pb，Se和Zn），并且两种灰烬都具有超强的碱度（pH> 12）。加速的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。泥浆碳化被认为是最有效的处理过程，可实现稳定的显着沥滤稳定性，同时还可以有效洗净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。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
代理获取

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号