Comparison of sewage sludge mono-incinerators: Mass balance and distribution of heavy metals in step grate and fluidized bed incinerators
Comparison of sewage sludge mono-incinerators: Mass balance and distribution of heavy metals in step grate and fluidized bed incinerators
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DOI：
10.1016/j.wasman.2020.02.044
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发表时间：
2020-03-15
期刊：
影响因子：
8.1
通讯作者：
Takaoka, Masaki
中科院分区：
文献类型：
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作者：
Cheng, Yingchao;Oleszek, Sylwia;Takaoka, Masaki
我们调查了包括非挥发性物质在内的18种元素的分布（Al、P、Ca、Fe、Mg、K、Mn、Cu、Na、Cr和Ni），半挥发物（Zn、Pb、Ag、As和Cd）和挥发物（Hg和S），并比较了它们在两种工业规模的污泥单焚烧炉中的行为，即一台步进炉排加煤机（GS）和两台流化床焚烧炉（F型），同样的饲料污泥。大多数的非挥发性元素富集五倍，在所有焚烧污水污泥灰（ISSA），而挥发性的S和汞几乎没有丰富的灰中，由于在气相中产生的燃烧成分。虽然半挥发性元素也富集五倍的F型，不同的富集行为中观察到的GS。锅炉和多级旋风除尘器的灰尘在GS表现出较高的富集铅和镉相比，灰由于较低的温度和较小的颗粒尺寸的综合影响。与F型相比，GS产生的灰烬毒性较低，主要成分为（99.7%），有害粉尘为次要成分。今后，在回收ISSA方面，应更多地关注炉排炉。(C)2020爱思唯尔有限公司保留所有权利。
We investigated the distribution of 18 elements including non-volatiles (Al, P, Ca, Fe, Mg, K, Mn, Cu, Na, Cr, and Ni), semi-volatiles (Zn, Pb, Ag, As, and Cd), and volatiles (Hg and S) and compared their behaviors in two types of full-scale sewage sludge mono-incinerators, namely, a step-grate stoker (GS) and two fluidized bed incinerators (F-types), with the same feed sludge. Most of the non-volatile elements were enriched five-fold in all incinerated sewage sludge ash (ISSA), while the volatile S and Hg were barely enriched in ash due to the combustion components generated in the gas phase. While the semivolatile elements were also enriched five-fold in the F-types, a different enrichment behavior was observed in the GS. Boiler and multi-cyclone dust in the GS showed higher enrichments of Pb and Cd compared to ash due to the combined effects of lower temperature and smaller particle size. Compared to the F-types, the GS generated ashes with lower toxicity as the major component (99.7%) and hazardous dust as the minor component. In the future, more attention should be paid to grate stokers in terms of recycling ISSA. (C) 2020 Elsevier Ltd. All rights reserved.