Polysulfide as a novel chemical agent to solidify/stabilize lead in fly ash from municipal solid waste incineration

Yifei Sun; Nobuhisa Watanabe; Wei Qiao; Xingbao Gao; Wei Wang; Tianle Zhu

doi:10.1016/j.chemosphere.2010.07.008

Polysulfide as a novel chemical agent to solidify/stabilize lead in fly ash from municipal solid waste incineration

Yifei Sun
, Nobuhisa Watanabe
, Wei Qiao
, Xingbao Gao
, Wei Wang
, Tianle Zhu^*

^*Corresponding author for this work

School of Materials Science and Engineering

Beihang University
Osaka Institute of Technology
China University of Petroleum - Beijing
Tsinghua University

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

19 Scopus citations

Abstract

Polysulfide was produced and tested for use as an inexpensive chemical agent for the solidification/stabilization of lead in fly ash, generating little hydrogen sulfide gas. According to the equations Sn2-→S+Sn-12- and Sn2-+H+→HS-+Sn-1, this agent was expected to achieve long-term stability of disposed Pb. The leachate concentration of Pb in fly ash after sulfide treatment showed a decrease-increase-decrease trend. We also compared Pb leaching behavior from an aging/weathering experiment to thermodynamic modeling using the database from the Geochemist's Workbench software. Thermodynamic modeling indicated the tendency that when the precipitate was formed in the order of PbO, PbCO₃·PbO, and PbCO₃, the total concentration of soluble Pb will be lowered. The leaching curve of Pb in fly ash without a lime slurry injection system was close to PbO, whose activity was initially near 1, but when leaching time increased, it shifted to that of PbCO₃·PbO, before finally ending at that of PbCO₃. However, Ca(OH)₂ sprayed on fly ash interfered with the carbonation process of Pb.

Original language	English
Pages (from-to)	120-126
Number of pages	7
Journal	Chemosphere
Volume	81
Issue number	1
DOIs	https://doi.org/10.1016/j.chemosphere.2010.07.008
State	Published - Sep 2010

UN SDGs

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

SDG 3 Good Health and Well-being
SDG 11 Sustainable Cities and Communities
SDG 12 Responsible Consumption and Production

Keywords

Carbonation
Chelate agent
Fly ash
Heavy metal
Leaching
Polysulfide agent

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10.1016/j.chemosphere.2010.07.008

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title = "Polysulfide as a novel chemical agent to solidify/stabilize lead in fly ash from municipal solid waste incineration",

abstract = "Polysulfide was produced and tested for use as an inexpensive chemical agent for the solidification/stabilization of lead in fly ash, generating little hydrogen sulfide gas. According to the equations Sn2-→S+Sn-12- and Sn2-+H+→HS-+Sn-1, this agent was expected to achieve long-term stability of disposed Pb. The leachate concentration of Pb in fly ash after sulfide treatment showed a decrease-increase-decrease trend. We also compared Pb leaching behavior from an aging/weathering experiment to thermodynamic modeling using the database from the Geochemist's Workbench software. Thermodynamic modeling indicated the tendency that when the precipitate was formed in the order of PbO, PbCO3·PbO, and PbCO3, the total concentration of soluble Pb will be lowered. The leaching curve of Pb in fly ash without a lime slurry injection system was close to PbO, whose activity was initially near 1, but when leaching time increased, it shifted to that of PbCO3·PbO, before finally ending at that of PbCO3. However, Ca(OH)2 sprayed on fly ash interfered with the carbonation process of Pb.",

keywords = "Carbonation, Chelate agent, Fly ash, Heavy metal, Leaching, Polysulfide agent",

author = "Yifei Sun and Nobuhisa Watanabe and Wei Qiao and Xingbao Gao and Wei Wang and Tianle Zhu",

year = "2010",

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T1 - Polysulfide as a novel chemical agent to solidify/stabilize lead in fly ash from municipal solid waste incineration

AU - Sun, Yifei

AU - Watanabe, Nobuhisa

AU - Qiao, Wei

AU - Gao, Xingbao

AU - Wang, Wei

AU - Zhu, Tianle

PY - 2010/9

Y1 - 2010/9

N2 - Polysulfide was produced and tested for use as an inexpensive chemical agent for the solidification/stabilization of lead in fly ash, generating little hydrogen sulfide gas. According to the equations Sn2-→S+Sn-12- and Sn2-+H+→HS-+Sn-1, this agent was expected to achieve long-term stability of disposed Pb. The leachate concentration of Pb in fly ash after sulfide treatment showed a decrease-increase-decrease trend. We also compared Pb leaching behavior from an aging/weathering experiment to thermodynamic modeling using the database from the Geochemist's Workbench software. Thermodynamic modeling indicated the tendency that when the precipitate was formed in the order of PbO, PbCO3·PbO, and PbCO3, the total concentration of soluble Pb will be lowered. The leaching curve of Pb in fly ash without a lime slurry injection system was close to PbO, whose activity was initially near 1, but when leaching time increased, it shifted to that of PbCO3·PbO, before finally ending at that of PbCO3. However, Ca(OH)2 sprayed on fly ash interfered with the carbonation process of Pb.

AB - Polysulfide was produced and tested for use as an inexpensive chemical agent for the solidification/stabilization of lead in fly ash, generating little hydrogen sulfide gas. According to the equations Sn2-→S+Sn-12- and Sn2-+H+→HS-+Sn-1, this agent was expected to achieve long-term stability of disposed Pb. The leachate concentration of Pb in fly ash after sulfide treatment showed a decrease-increase-decrease trend. We also compared Pb leaching behavior from an aging/weathering experiment to thermodynamic modeling using the database from the Geochemist's Workbench software. Thermodynamic modeling indicated the tendency that when the precipitate was formed in the order of PbO, PbCO3·PbO, and PbCO3, the total concentration of soluble Pb will be lowered. The leaching curve of Pb in fly ash without a lime slurry injection system was close to PbO, whose activity was initially near 1, but when leaching time increased, it shifted to that of PbCO3·PbO, before finally ending at that of PbCO3. However, Ca(OH)2 sprayed on fly ash interfered with the carbonation process of Pb.

KW - Carbonation

KW - Chelate agent

KW - Fly ash

KW - Heavy metal

KW - Leaching

KW - Polysulfide agent

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DO - 10.1016/j.chemosphere.2010.07.008

M3 - 文章

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AN - SCOPUS:77956063621

SN - 0045-6535

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JO - Chemosphere

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IS - 1

ER -

Polysulfide as a novel chemical agent to solidify/stabilize lead in fly ash from municipal solid waste incineration

Abstract

UN SDGs

Keywords

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