Hydrothermal solidification behavior of municipal solid waste incineration bottom ash without any additives

Zhenzi Jing; Xinwei Fan; Lei Zhou; Junjie Fan; Yi Zhang; Xiaohui Pan; Emile Hideki Ishida

doi:10.1016/j.wasman.2013.01.038

Hydrothermal solidification behavior of municipal solid waste incineration bottom ash without any additives

Zhenzi Jing, Xinwei Fan, Lei Zhou, Junjie Fan, Yi Zhang, Xiaohui Pan, Emile Hideki Ishida

Environmental Studies

Research output: Contribution to journal › Article › peer-review

43 Citations (Scopus)

Abstract

Municipal solid waste incineration (MSWI) bottom ash could be solidified with and without slaked lime (calcium hydroxide) addition by a hydrothermal method under steam pressure of 1.56MPa at 200°C for up to 72h. Experimental results showed that CSH gel or tobermorite exerted a main influence on strength development, and without any additives CSH gel was easy to form, while slaked lime addition favored to form tobermorite. Tobermorite seemed to exert a larger effect on the strength development than CSH gel. Leaching results showed that the concentrations of heavy metals dissolved from the solidified specimens were effectively reduced after hydrothermal processing. The immobilization was mainly due to the tobermorite or CSH gel formation, and Pb²⁺ and Zn²⁺ seemed to be fixed more readily than Cr⁶⁺, which might be the reason that the structural Ca²⁺ within tobermorite or CSH gel was exchanged by Pb²⁺ and Zn²⁺ more easily than Cr⁶⁺. In addition, there existed a close relationship between leaching concentration and strength enhancement, and a higher strength seemed to exert a larger effect on immobilization of heavy metals.

Original language	English
Pages (from-to)	1182-1189
Number of pages	8
Journal	Waste Management
Volume	33
Issue number	5
DOIs	https://doi.org/10.1016/j.wasman.2013.01.038
Publication status	Published - 2013 May

Keywords

CSH gel
Hydrothermal solidification
Leaching behavior
MSWI bottom ash
Tobermorite

ASJC Scopus subject areas

Waste Management and Disposal

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.wasman.2013.01.038

Cite this

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title = "Hydrothermal solidification behavior of municipal solid waste incineration bottom ash without any additives",

abstract = "Municipal solid waste incineration (MSWI) bottom ash could be solidified with and without slaked lime (calcium hydroxide) addition by a hydrothermal method under steam pressure of 1.56MPa at 200°C for up to 72h. Experimental results showed that CSH gel or tobermorite exerted a main influence on strength development, and without any additives CSH gel was easy to form, while slaked lime addition favored to form tobermorite. Tobermorite seemed to exert a larger effect on the strength development than CSH gel. Leaching results showed that the concentrations of heavy metals dissolved from the solidified specimens were effectively reduced after hydrothermal processing. The immobilization was mainly due to the tobermorite or CSH gel formation, and Pb2+ and Zn2+ seemed to be fixed more readily than Cr6+, which might be the reason that the structural Ca2+ within tobermorite or CSH gel was exchanged by Pb2+ and Zn2+ more easily than Cr6+. In addition, there existed a close relationship between leaching concentration and strength enhancement, and a higher strength seemed to exert a larger effect on immobilization of heavy metals.",

keywords = "CSH gel, Hydrothermal solidification, Leaching behavior, MSWI bottom ash, Tobermorite",

author = "Zhenzi Jing and Xinwei Fan and Lei Zhou and Junjie Fan and Yi Zhang and Xiaohui Pan and Ishida, {Emile Hideki}",

note = "Funding Information: The work reported here was supported by Shanghai Science and Technology Committee Program (China) (No. 09JC1413900 ), the National Natural Science Foundation of China (Nos. 51072138 and 51272180 ). ",

year = "2013",

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doi = "10.1016/j.wasman.2013.01.038",

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T1 - Hydrothermal solidification behavior of municipal solid waste incineration bottom ash without any additives

AU - Jing, Zhenzi

AU - Fan, Xinwei

AU - Zhou, Lei

AU - Fan, Junjie

AU - Zhang, Yi

AU - Pan, Xiaohui

AU - Ishida, Emile Hideki

N1 - Funding Information: The work reported here was supported by Shanghai Science and Technology Committee Program (China) (No. 09JC1413900 ), the National Natural Science Foundation of China (Nos. 51072138 and 51272180 ).

PY - 2013/5

Y1 - 2013/5

N2 - Municipal solid waste incineration (MSWI) bottom ash could be solidified with and without slaked lime (calcium hydroxide) addition by a hydrothermal method under steam pressure of 1.56MPa at 200°C for up to 72h. Experimental results showed that CSH gel or tobermorite exerted a main influence on strength development, and without any additives CSH gel was easy to form, while slaked lime addition favored to form tobermorite. Tobermorite seemed to exert a larger effect on the strength development than CSH gel. Leaching results showed that the concentrations of heavy metals dissolved from the solidified specimens were effectively reduced after hydrothermal processing. The immobilization was mainly due to the tobermorite or CSH gel formation, and Pb2+ and Zn2+ seemed to be fixed more readily than Cr6+, which might be the reason that the structural Ca2+ within tobermorite or CSH gel was exchanged by Pb2+ and Zn2+ more easily than Cr6+. In addition, there existed a close relationship between leaching concentration and strength enhancement, and a higher strength seemed to exert a larger effect on immobilization of heavy metals.

AB - Municipal solid waste incineration (MSWI) bottom ash could be solidified with and without slaked lime (calcium hydroxide) addition by a hydrothermal method under steam pressure of 1.56MPa at 200°C for up to 72h. Experimental results showed that CSH gel or tobermorite exerted a main influence on strength development, and without any additives CSH gel was easy to form, while slaked lime addition favored to form tobermorite. Tobermorite seemed to exert a larger effect on the strength development than CSH gel. Leaching results showed that the concentrations of heavy metals dissolved from the solidified specimens were effectively reduced after hydrothermal processing. The immobilization was mainly due to the tobermorite or CSH gel formation, and Pb2+ and Zn2+ seemed to be fixed more readily than Cr6+, which might be the reason that the structural Ca2+ within tobermorite or CSH gel was exchanged by Pb2+ and Zn2+ more easily than Cr6+. In addition, there existed a close relationship between leaching concentration and strength enhancement, and a higher strength seemed to exert a larger effect on immobilization of heavy metals.

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KW - Leaching behavior

KW - MSWI bottom ash

KW - Tobermorite

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Hydrothermal solidification behavior of municipal solid waste incineration bottom ash without any additives

Abstract

Keywords

ASJC Scopus subject areas

UN SDGs

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