Physicochemical and pozzolanic properties of municipal solid waste incineration fly ash with different pretreatments

Zhen Chen; Jiang Shan Li; Chi Sun Poon; Wen Hao Jiang; Zi Han Ma; Xin Chen; Jian Xin Lu; Hao Xin Dong

doi:10.1016/j.wasman.2023.02.016

Physicochemical and pozzolanic properties of municipal solid waste incineration fly ash with different pretreatments

Zhen Chen, Jiang Shan Li, Chi Sun Poon, Wen Hao Jiang, Zi Han Ma, Xin Chen, Jian Xin Lu, Hao Xin Dong

Research output: Journal article publication › Journal article › Academic research › peer-review

25 Citations (Scopus)

Abstract

Swelling caused by gas generated from municipal solid waste incineration fly ash (MSWIFA) when it is mixed with alkali limits its uses. Besides, the leaching of anion salts and heavy metals contained in MSWIFA poses a high risk to environment. This study presents the feasibility of a one-step alkaline washing, one-step thermal quenching and two-step combination of alkaline washing and thermal quenching pretreatment methods in altering the key properties of MSWIFA for promoting its reusability. It was found that apart from H₂(gas), NH₃(gas) was also generated during the alkaline washing of the MSWIFA. Besides, pretreatments led to the reduction in particle size, the increase in pore volume and specific surface area of the MSWIFA, as well as the removal of chloride and sulfate anions. All the pretreatment methods were effective in reducing leaching of heavy metals to below levels of nonhazardous waste except Cd and Pb with alkaline washing. Furthermore, both the chemical Frattini test and the mechanical activity index test showed improvement in pozzolanic activities of the MSWIFA after the pretreatments. Overall, the combined pretreatment method was most effective in eliminating gas emission, and reducing leaching of metal ions and anions from the ash, while enhancing the pozzolanic activity of the ash.

Original language	English
Pages (from-to)	146-155
Number of pages	10
Journal	Waste Management
Volume	160
DOIs	https://doi.org/10.1016/j.wasman.2023.02.016
Publication status	Published - 1 Apr 2023

Keywords

Chloride
Leaching
MSWI fly ash
Pozzolanic activity
Pretreatment
Sulfate

ASJC Scopus subject areas

Waste Management and Disposal

More information

10.1016/j.wasman.2023.02.016

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@article{0cc6bcea485f430584a1a04814957318,

title = "Physicochemical and pozzolanic properties of municipal solid waste incineration fly ash with different pretreatments",

abstract = "Swelling caused by gas generated from municipal solid waste incineration fly ash (MSWIFA) when it is mixed with alkali limits its uses. Besides, the leaching of anion salts and heavy metals contained in MSWIFA poses a high risk to environment. This study presents the feasibility of a one-step alkaline washing, one-step thermal quenching and two-step combination of alkaline washing and thermal quenching pretreatment methods in altering the key properties of MSWIFA for promoting its reusability. It was found that apart from H2(gas), NH3(gas) was also generated during the alkaline washing of the MSWIFA. Besides, pretreatments led to the reduction in particle size, the increase in pore volume and specific surface area of the MSWIFA, as well as the removal of chloride and sulfate anions. All the pretreatment methods were effective in reducing leaching of heavy metals to below levels of nonhazardous waste except Cd and Pb with alkaline washing. Furthermore, both the chemical Frattini test and the mechanical activity index test showed improvement in pozzolanic activities of the MSWIFA after the pretreatments. Overall, the combined pretreatment method was most effective in eliminating gas emission, and reducing leaching of metal ions and anions from the ash, while enhancing the pozzolanic activity of the ash.",

keywords = "Chloride, Leaching, MSWI fly ash, Pozzolanic activity, Pretreatment, Sulfate",

author = "Zhen Chen and Li, {Jiang Shan} and Poon, {Chi Sun} and Jiang, {Wen Hao} and Ma, {Zi Han} and Xin Chen and Lu, {Jian Xin} and Dong, {Hao Xin}",

note = "Funding Information: This study was financially supported by the International Partnership Program of Chinese Academy of Sciences , China (Grant No. 115242KYSB20200002 ), the National Natural Science Foundation of China for Young Scientist , China (Grant No. 52108357 ) and the China Postdoctoral Science Foundation , China ( 2021M700162 ). The authors would also like to thank Shiyanjia Lab (www.shiyanjia.com) for the SEM measurements. Funding Information: This study was financially supported by the International Partnership Program of Chinese Academy of Sciences, China (Grant No. 115242KYSB20200002), the National Natural Science Foundation of China for Young Scientist, China (Grant No. 52108357) and the China Postdoctoral Science Foundation, China (2021M700162). The authors would also like to thank Shiyanjia Lab (www.shiyanjia.com) for the SEM measurements. Publisher Copyright: {\textcopyright} 2023 Elsevier Ltd",

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doi = "10.1016/j.wasman.2023.02.016",

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T1 - Physicochemical and pozzolanic properties of municipal solid waste incineration fly ash with different pretreatments

AU - Chen, Zhen

AU - Li, Jiang Shan

AU - Poon, Chi Sun

AU - Jiang, Wen Hao

AU - Ma, Zi Han

AU - Chen, Xin

AU - Lu, Jian Xin

AU - Dong, Hao Xin

N1 - Funding Information: This study was financially supported by the International Partnership Program of Chinese Academy of Sciences , China (Grant No. 115242KYSB20200002 ), the National Natural Science Foundation of China for Young Scientist , China (Grant No. 52108357 ) and the China Postdoctoral Science Foundation , China ( 2021M700162 ). The authors would also like to thank Shiyanjia Lab (www.shiyanjia.com) for the SEM measurements. Funding Information: This study was financially supported by the International Partnership Program of Chinese Academy of Sciences, China (Grant No. 115242KYSB20200002), the National Natural Science Foundation of China for Young Scientist, China (Grant No. 52108357) and the China Postdoctoral Science Foundation, China (2021M700162). The authors would also like to thank Shiyanjia Lab (www.shiyanjia.com) for the SEM measurements. Publisher Copyright: © 2023 Elsevier Ltd

PY - 2023/4/1

Y1 - 2023/4/1

N2 - Swelling caused by gas generated from municipal solid waste incineration fly ash (MSWIFA) when it is mixed with alkali limits its uses. Besides, the leaching of anion salts and heavy metals contained in MSWIFA poses a high risk to environment. This study presents the feasibility of a one-step alkaline washing, one-step thermal quenching and two-step combination of alkaline washing and thermal quenching pretreatment methods in altering the key properties of MSWIFA for promoting its reusability. It was found that apart from H2(gas), NH3(gas) was also generated during the alkaline washing of the MSWIFA. Besides, pretreatments led to the reduction in particle size, the increase in pore volume and specific surface area of the MSWIFA, as well as the removal of chloride and sulfate anions. All the pretreatment methods were effective in reducing leaching of heavy metals to below levels of nonhazardous waste except Cd and Pb with alkaline washing. Furthermore, both the chemical Frattini test and the mechanical activity index test showed improvement in pozzolanic activities of the MSWIFA after the pretreatments. Overall, the combined pretreatment method was most effective in eliminating gas emission, and reducing leaching of metal ions and anions from the ash, while enhancing the pozzolanic activity of the ash.

AB - Swelling caused by gas generated from municipal solid waste incineration fly ash (MSWIFA) when it is mixed with alkali limits its uses. Besides, the leaching of anion salts and heavy metals contained in MSWIFA poses a high risk to environment. This study presents the feasibility of a one-step alkaline washing, one-step thermal quenching and two-step combination of alkaline washing and thermal quenching pretreatment methods in altering the key properties of MSWIFA for promoting its reusability. It was found that apart from H2(gas), NH3(gas) was also generated during the alkaline washing of the MSWIFA. Besides, pretreatments led to the reduction in particle size, the increase in pore volume and specific surface area of the MSWIFA, as well as the removal of chloride and sulfate anions. All the pretreatment methods were effective in reducing leaching of heavy metals to below levels of nonhazardous waste except Cd and Pb with alkaline washing. Furthermore, both the chemical Frattini test and the mechanical activity index test showed improvement in pozzolanic activities of the MSWIFA after the pretreatments. Overall, the combined pretreatment method was most effective in eliminating gas emission, and reducing leaching of metal ions and anions from the ash, while enhancing the pozzolanic activity of the ash.

KW - Chloride

KW - Leaching

KW - MSWI fly ash

KW - Pozzolanic activity

KW - Pretreatment

KW - Sulfate

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U2 - 10.1016/j.wasman.2023.02.016

DO - 10.1016/j.wasman.2023.02.016

M3 - Journal article

C2 - 36827883

AN - SCOPUS:85148541839

SN - 0956-053X

VL - 160

SP - 146

EP - 155

JO - Waste Management

JF - Waste Management

ER -

Physicochemical and pozzolanic properties of municipal solid waste incineration fly ash with different pretreatments

Abstract

Keywords

ASJC Scopus subject areas

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