Stabilisation/solidification of municipal solid waste incineration fly ash by phosphate-enhanced calcium aluminate cement

Liang Chen; Yan-Shuai Wang; Lei Wang; Yuying Zhang; Jining Li; Lizhi Tong; Qing Hu; Jian-Guo Dai; Daniel C.W. Tsang

doi:10.1016/j.jhazmat.2020.124404

Stabilisation/solidification of municipal solid waste incineration fly ash by phosphate-enhanced calcium aluminate cement

Liang Chen
, Yan-Shuai Wang
, Lei Wang^*
, Yuying Zhang
, Jining Li
, Lizhi Tong
, Qing Hu
, Jian-Guo Dai
, Daniel C.W. Tsang

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

141 Citations (Scopus)

Abstract

Landfill disposal of municipal solid waste incineration fly ash (MIFA) presents significant environmental and economic burden. This study proposed a novel and high-efficiency approach for stabilisation/solidification (S/S) of MIFA by phosphate-modified calcium aluminate cement (CAC). Experimental results showed that the presence of Pb (the most leachable metal contaminant in the MIFA) retarded the early-stage reaction of CAC, resulting in an extension of setting time and a significant decline of compressive strength of CAC pastes. The incorporation of phosphate additives (10 wt% of binder), especially for trisodium phosphate, in CAC system effectively mitigated the negative impact of Pb on the CAC reaction and reduced the Pb leachability. Elemental mapping results illustrated that Pb²⁺ coordinated with phosphate to generate insoluble precipitates (e.g., Pb₃(PO₄)₂). The S/S treated MIFA samples fulfilled the compressive strength and leachability requirements for on-site reuse. Overall, this study demonstrated that phosphate-modified CAC is a promising binder for S/S of hazardous MIFA. © 2020 Elsevier B.V.

Original language	English
Article number	124404
Journal	Journal of Hazardous Materials
Volume	408
Online published	29 Oct 2020
DOIs	https://doi.org/10.1016/j.jhazmat.2020.124404
Publication status	Published - 15 Apr 2021
Externally published	Yes

Funding

The authors appreciate the financial support from the Hong Kong Research Grants Council , China ( E-PolyU503–17 ) and the Alexander von Humboldt Foundation , Germany (AvH) for this study.

UN SDGs

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

SDG 11 Sustainable Cities and Communities
SDG 12 Responsible Consumption and Production

Research Keywords

Green and sustainable remediation
Hazardous waste treatment
High-alumina cement
Metal leachability
Phosphate additives

RGC Funding Information

RGC-funded

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10.1016/j.jhazmat.2020.124404

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@article{38bc11ec0fce44b29df918125aaa6712,

title = "Stabilisation/solidification of municipal solid waste incineration fly ash by phosphate-enhanced calcium aluminate cement",

abstract = "Landfill disposal of municipal solid waste incineration fly ash (MIFA) presents significant environmental and economic burden. This study proposed a novel and high-efficiency approach for stabilisation/solidification (S/S) of MIFA by phosphate-modified calcium aluminate cement (CAC). Experimental results showed that the presence of Pb (the most leachable metal contaminant in the MIFA) retarded the early-stage reaction of CAC, resulting in an extension of setting time and a significant decline of compressive strength of CAC pastes. The incorporation of phosphate additives (10 wt\% of binder), especially for trisodium phosphate, in CAC system effectively mitigated the negative impact of Pb on the CAC reaction and reduced the Pb leachability. Elemental mapping results illustrated that Pb2+ coordinated with phosphate to generate insoluble precipitates (e.g., Pb3(PO4)2). The S/S treated MIFA samples fulfilled the compressive strength and leachability requirements for on-site reuse. Overall, this study demonstrated that phosphate-modified CAC is a promising binder for S/S of hazardous MIFA. {\textcopyright} 2020 Elsevier B.V.",

keywords = "Green and sustainable remediation, Hazardous waste treatment, High-alumina cement, Metal leachability, Phosphate additives",

author = "Liang Chen and Yan-Shuai Wang and Lei Wang and Yuying Zhang and Jining Li and Lizhi Tong and Qing Hu and Jian-Guo Dai and Tsang, \{Daniel C.W.\}",

year = "2021",

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day = "15",

doi = "10.1016/j.jhazmat.2020.124404",

language = "English",

volume = "408",

journal = "Journal of Hazardous Materials",

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TY - JOUR

T1 - Stabilisation/solidification of municipal solid waste incineration fly ash by phosphate-enhanced calcium aluminate cement

AU - Chen, Liang

AU - Wang, Yan-Shuai

AU - Wang, Lei

AU - Zhang, Yuying

AU - Li, Jining

AU - Tong, Lizhi

AU - Hu, Qing

AU - Dai, Jian-Guo

AU - Tsang, Daniel C.W.

PY - 2021/4/15

Y1 - 2021/4/15

N2 - Landfill disposal of municipal solid waste incineration fly ash (MIFA) presents significant environmental and economic burden. This study proposed a novel and high-efficiency approach for stabilisation/solidification (S/S) of MIFA by phosphate-modified calcium aluminate cement (CAC). Experimental results showed that the presence of Pb (the most leachable metal contaminant in the MIFA) retarded the early-stage reaction of CAC, resulting in an extension of setting time and a significant decline of compressive strength of CAC pastes. The incorporation of phosphate additives (10 wt% of binder), especially for trisodium phosphate, in CAC system effectively mitigated the negative impact of Pb on the CAC reaction and reduced the Pb leachability. Elemental mapping results illustrated that Pb2+ coordinated with phosphate to generate insoluble precipitates (e.g., Pb3(PO4)2). The S/S treated MIFA samples fulfilled the compressive strength and leachability requirements for on-site reuse. Overall, this study demonstrated that phosphate-modified CAC is a promising binder for S/S of hazardous MIFA. © 2020 Elsevier B.V.

AB - Landfill disposal of municipal solid waste incineration fly ash (MIFA) presents significant environmental and economic burden. This study proposed a novel and high-efficiency approach for stabilisation/solidification (S/S) of MIFA by phosphate-modified calcium aluminate cement (CAC). Experimental results showed that the presence of Pb (the most leachable metal contaminant in the MIFA) retarded the early-stage reaction of CAC, resulting in an extension of setting time and a significant decline of compressive strength of CAC pastes. The incorporation of phosphate additives (10 wt% of binder), especially for trisodium phosphate, in CAC system effectively mitigated the negative impact of Pb on the CAC reaction and reduced the Pb leachability. Elemental mapping results illustrated that Pb2+ coordinated with phosphate to generate insoluble precipitates (e.g., Pb3(PO4)2). The S/S treated MIFA samples fulfilled the compressive strength and leachability requirements for on-site reuse. Overall, this study demonstrated that phosphate-modified CAC is a promising binder for S/S of hazardous MIFA. © 2020 Elsevier B.V.

KW - Green and sustainable remediation

KW - Hazardous waste treatment

KW - High-alumina cement

KW - Metal leachability

KW - Phosphate additives

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U2 - 10.1016/j.jhazmat.2020.124404

DO - 10.1016/j.jhazmat.2020.124404

M3 - RGC 21 - Publication in refereed journal

C2 - 33153794

AN - SCOPUS:85091632901

SN - 0304-3894

VL - 408

JO - Journal of Hazardous Materials

JF - Journal of Hazardous Materials

M1 - 124404

ER -

Stabilisation/solidification of municipal solid waste incineration fly ash by phosphate-enhanced calcium aluminate cement

Abstract

Funding

UN SDGs

Research Keywords

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