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Changes in composition and lead speciation due to water washing of air pollution control residue from municipal waste incineration.
Journal of Hazardous Materials ( IF 12.2 ) Pub Date : 2018-08-18 , DOI: 10.1016/j.jhazmat.2018.08.051
A A Bogush 1 , J A Stegemann 1 , A Roy 2
Affiliation  

Changes in elemental and mineralogical composition, and lead speciation, of air pollution control residue (APCR) from municipal solid waste incineration, due to treatment by water washing, were investigated in this work and are reported in the context of a review of the literature. Water washing was shown to substantially modify the nature of APCR by: 1) removing 23% dry mass soluble salts to disagglomerate particles and significantly reduce concentrations of the associated major elements, and increase concentrations of insoluble matrix elements and potential pollutants; and 2) respeciating elements to form new phases. X-ray absorption near edge spectroscopy (XANES) showed that the 500 mg/kg of Pb in raw and washed APCR were comprised mainly of Pb-glass, with some PbSO4, and small amounts of PbO and PbCl2. Semi-quantitative linear combination fitting suggests that the glass in the APCR may be unstable and release Pb under the alkaline pH of water washing, to reprecipitate as PbO. Chemical analysis suggests that some Pb may be removed by washing. Scientific understanding of the composition of raw and washed APCR, and particularly the speciation of potentially toxic metals, such as Zn and Pb, can help in developing effective element recovery and residue treatment, utilization or disposal strategies.

中文翻译:

由于对城市垃圾焚烧产生的空气污染控制残留物进行了水洗,因此成分和铅形态发生了变化。

在这项工作中,研究了城市居民垃圾焚烧产生的空气污染控制残留物(APCR)的元素和矿物组成以及铅形态的变化,该变化在这项工作中得到了报道,并在文献综述的背景下进行了报道。水洗显示出可以通过以下方式大大改变APCR的性质:1)去除23%的干质量可溶性盐以使颗粒团聚,并显着降低相关主要元素的浓度,并增加不溶性基质元素和潜在污染物的浓度;2)重新确定元素以形成新的阶段。X射线吸收近缘光谱法(XANES)表明,未经处理和洗涤过的APCR中500 mg / kg的Pb主要由Pb玻璃,一些PbSO4和少量PbO和PbCl2组成。半定量线性组合拟合表明,APCR中的玻璃可能不稳定,并且在水洗的碱性pH下会释放Pb,从而重新沉淀为PbO。化学分析表明,某些铅可以通过洗涤除去。科学地了解未经处理的和经过洗涤的APCR的组成,特别是对潜在有毒金属的形态(例如Zn和Pb)的了解,可以帮助开发有效的元素回收和残留物处理,利用或处置策略。
更新日期:2018-08-18
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