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Speciation evolutions of target metals (Cd, Pb) influenced by chlorine and sulfur during sewage sludge incineration
Alternative TitleSpeciation evolutions of target metals (Cd, Pb) influenced by chlorine and sulfur during sewage sludge incineration
Luan Jingde; Li Rundong; Zhang Zhihui; Li Yanlong; Zhao Yun
2014
Source PublicationFRONTIERS OF ENVIRONMENTAL SCIENCE & ENGINEERING
ISSN2095-2201
Volume8Issue:6Pages:871-876
AbstractIn sludge incineration, the thermal behavior of heavy metal is a growing concern. In this work, the combined analysis of metal partitioning behavior between vapor phase and condensed phase, speciation redistribution in condensed phase and the difference of metal species in binding energy was carried out to investigate the possible volatilization-condensation mechanism of heavy metals in high-temperature sludge incineration. It was found that there were two steps in metal volatilization. The initial volatilization of heavy metal originated from their exchangeable (EXC), carbonate bound (CAR) and iron-manganese bound (FM) fractions, which is primarily composed of simple substance, chlorides, oxides and sulfides. With the increase of chlorine and sulfur in sludge, the inner speciation redistribution of heavy metals occurred in condensed phase, which was an important factor affecting the potential volatility of heavy metals. A partial of metal species with complexed (COM) and residual (RES) fractions gradually decomposed into simple substance or ions, oxides and carbonates, which significantly strengthened the second volatility. In presence of chlorine, about 46% of Cd with the RES fraction disappeared when the volatility rate of Cd increased by 44.89%. Moreover, about 9% of Pb with COM fraction disappeared when there was an increase of nearly 10% in the volatilization rate. Thus, the second volatilization was mainly controlled by the decomposition of metal species with COM and RES fractions. By virtue of XRD analysis and the binding energy calculation, it was found that metal complex and silicates were inclined to decompose under high temperature due to poor thermo stability as compared with sulfates.
Other AbstractIn sludge incineration, the thermal behavior of heavy metal is a growing concern. In this work, the combined analysis of metal partitioning behavior between vapor phase and condensed phase, speciation redistribution in condensed phase and the difference of metal species in binding energy was carried out to investigate the possible volatilization-condensation mechanism of heavy metals in high-temperature sludge incineration. It was found that there were two steps in metal volatilization. The initial volatilization of heavy metal originated from their exchangeable (EXC), carbonate bound (CAR) and iron– manganese bound (FM) fractions, which is primarily composed of simple substance, chlorides, oxides and sulfides. With the increase of chlorine and sulfur in sludge, the inner speciation redistribution of heavy metals occurred in condensed phase, which was an important factor affecting the potential volatility of heavy metals. A partial of metal species with complexed (COM) and residual (RES) fractions gradually decomposed into simple substance or ions, oxides and carbonates, which significantly strengthened the second volatility. In presence of chlorine, about 46% of Cd with the RES fraction disappeared when the volatility rate of Cd increased by 44.89%. Moreover, about 9% of Pb with COM fraction disappeared when there was an increase of nearly 10% in the volatilization rate. Thus, the second volatilization was mainly controlled by the decomposition of metal species with COM and RES fractions. By virtue of XRD analysis and the binding energy calculation, it was found that metal complex and silicates were inclined to decompose under high temperature due to poor thermo stability as compared with sulfates.
KeywordSOLID-WASTE MSW FLUIDIZED-BED COMBUSTION HEAVY-METALS THERMAL-TREATMENT ELEMENT BEHAVIOR COCOMBUSTION EMISSIONS RESIDUES PLANT FATE sludge incineration heavy metals inner speciation redistribution binding energy
Indexed ByCSCD
Language英语
Funding Project[National Basic Research Program of China] ; [National Natural Science Foundation of China]
CSCD IDCSCD:5325421
Citation statistics
Cited Times:1[CSCD]   [CSCD Record]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/146255
Collection中国科学院金属研究所
Affiliation中国科学院金属研究所
Recommended Citation
GB/T 7714
Luan Jingde,Li Rundong,Zhang Zhihui,et al. Speciation evolutions of target metals (Cd, Pb) influenced by chlorine and sulfur during sewage sludge incineration[J]. FRONTIERS OF ENVIRONMENTAL SCIENCE & ENGINEERING,2014,8(6):871-876.
APA Luan Jingde,Li Rundong,Zhang Zhihui,Li Yanlong,&Zhao Yun.(2014).Speciation evolutions of target metals (Cd, Pb) influenced by chlorine and sulfur during sewage sludge incineration.FRONTIERS OF ENVIRONMENTAL SCIENCE & ENGINEERING,8(6),871-876.
MLA Luan Jingde,et al."Speciation evolutions of target metals (Cd, Pb) influenced by chlorine and sulfur during sewage sludge incineration".FRONTIERS OF ENVIRONMENTAL SCIENCE & ENGINEERING 8.6(2014):871-876.
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