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Cited by 26Concrete and Cement Materials ResearchRecycling and utilization of industrial and municipal waste in materials productionGeotechnical Engineering and Soil Stabilization

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Experimental study on solidification/stabilisation of high-salt sludge by alkali-activated GGBS and MSWI bottom ash cementitious materials

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Feng, Deluan, Wang, Jie, Wang, Yuxin, Liang, Shihua·2023·Case Studies in Construction Materials
DOI 10.1016/j.cscm.2023.e02417
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Abstract

This study utilises alkali-activated ground granulated blast furnace slag (GGBS) as the primary method for solidification/stabilisation, with municipal solid waste incineration (MSWI) bottom ash (BA) as an auxiliary precursor to assist in the solidification/stabilisation (S/S) of high-salt sludge. The results show that the alkali-activated GGBS and MSWI BA cementitious material can effectively realize the S/S of high-salt sludge. However, having early strength of the alkali-activated GGBS solidified sludge at low GGBS content is difficult. In comparison, the addition of MSWI BA enhances the unconfined compressive strength (UCS) of the alkali-activated GGBS solidified sludge to reach 6.35 MPa at 3d curing age, whereas the UCS of the alkali-activated GGBS solidified sludge with 20% GGBS achieves only 0.31 MPa at 14d curing age. The MSWI BA significantly improves the effect of S/S on high-salt sludge by alkali-activated GGBS, and the solidified high-salt sludge with 20% alkali-activated GGBS and MSWI BA cementitious material exhibits good water stability, the UCS of which retain 2.33 MPa after 28d water immersion. The analysis of the mineral composition, chemical bond transformation, thermal stability and microstructure of the solidified sludge samples indicates that the geopolymer cementitious material generated by alkali-activated GGBS and MSWI BA can effectively cement and wrap sludge particles and soluble salts, and reduce the strength loss of the solidified samples after water immersion. Moreover, the addition of MSWI BA accelerates the polymerization of alkali-activated GGBS, leading to rapid solidification/stabilisation of high-salt sludge in early curing age and reduction of the consumption of mineral resources. The heavy metal leaching concentration of the solidified sludge is much lower than that of the raw MSWI BA, and can satisfy the pollution control standard limit of landfill. The immobilization efficiency of the heavy metals of the solidified sludge is larger than 89%. By using MSWI BA as an auxiliary precursor in alkali-activated GGBS, the co-disposal of high-salt sludge and MSWI BA can be achieved, providing insights for realizing the energy conservation and environment protection purposes of solid waste reclamation and GGBS consumption reduction.

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Metadata

Authors
Feng, D., Wang, J., Wang, Y., & Liang, S.
Affiliations
Guangdong University of Technology (CN)
ORCID
Venue
Case Studies in Construction Materials
Publisher
Elsevier BV
Published
2023-12
Volume
19
Pages
e02417
ISSN
2214-5095 (ISSN-L)
DOI
10.1016/j.cscm.2023.e02417
OpenAlex
W4386072721
Cited by
26
References
1
Citations by year
2026: 2 · 2025: 11 · 2024: 10 · 2023: 3
FWCI
2.80
Type
journal article
Language
en
Open access
Licence
Locations
  • Case Studies in Construction Materials (publishedVersion, cc-by-nc-nd)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
  • Guangzhou Municipal Science and Technology Program key projects (202002030194)
  • National Natural Science Foundation of China-Guangdong Joint Fund (2022A1515011047)
  • National Natural Science Foundation of China (52078142)
  • Natural Science Foundation of Guangdong Province
Topics
  • Physical Sciences › Engineering › Civil and Structural Engineering › Concrete and Cement Materials Research
  • Physical Sciences › Engineering › Building and Construction › Recycling and utilization of industrial and municipal waste in materials production
  • Physical Sciences › Engineering › Civil and Structural Engineering › Geotechnical Engineering and Soil Stabilization
Keywords
municipal solid waste incineration bottom ash, heavy metal immobilization, unconfined compressive strength, water stability, heavy metal leaching, thermal stability, microstructure, mineral composition

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