Experimental Research on Curing Characteristics of Sludge with High-Salt- Content Leachate Solidified by Cement in Domestic Waste Landfills

SONG Shuxiang; ZHENG Chao; YANG Kun; FENG Deluan

doi:10.3724/j.gyjzG22110711

Volume 55 Issue 2

Feb. 2025

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Article Navigation > INDUSTRIAL CONSTRUCTION > 2025 > 55(2): 206-215

SONG Shuxiang, ZHENG Chao, YANG Kun, FENG Deluan. Experimental Research on Curing Characteristics of Sludge with High-Salt- Content Leachate Solidified by Cement in Domestic Waste Landfills[J]. INDUSTRIAL CONSTRUCTION, 2025, 55(2): 206-215. doi: 10.3724/j.gyjzG22110711

Citation:

SONG Shuxiang, ZHENG Chao, YANG Kun, FENG Deluan. Experimental Research on Curing Characteristics of Sludge with High-Salt- Content Leachate Solidified by Cement in Domestic Waste Landfills[J]. INDUSTRIAL CONSTRUCTION, 2025, 55(2): 206-215. doi: 10.3724/j.gyjzG22110711

Citation:

SONG Shuxiang, ZHENG Chao, YANG Kun, FENG Deluan. Experimental Research on Curing Characteristics of Sludge with High-Salt- Content Leachate Solidified by Cement in Domestic Waste Landfills[J]. INDUSTRIAL CONSTRUCTION, 2025, 55(2): 206-215. doi: 10.3724/j.gyjzG22110711

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Experimental Research on Curing Characteristics of Sludge with High-Salt- Content Leachate Solidified by Cement in Domestic Waste Landfills

doi: 10.3724/j.gyjzG22110711

1. GZ Environmental Protection Investment Group Co., Ltd., Guangzhou 510180, China;
2. School of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou 510006, China

Received Date: 2022-11-07
Available Online: 2025-04-02

Abstract

Abstract

The landfill leachate sludge produced by submerged combustion process has the characteristics of low organic matter content and heavy metal content but high liquid index and salt content. Ordinary Portland cement and sulphoaluminate cement with different cement types and cement contents were used to solidifiy leachate sludge. The unconfined compressive strength test and immersion test were carried out to evaluate the reinforcement effect of cement on the strength and water stability of high-salt-content leachate sludge. Meanwhile, microscopy tests were carried out on the solidified sludge samples to explore the micro-control mechanism of cement solidification effect. The test results showed that: 1) the curing effect of ordinary Portland cement on sludge with high-salt-content leachate was non-ideal;2) the unconfined compressive strength of solidified sludge with 10% sulfoaluminate cement content for 28 d curing age met the strength requirement of solidified sludge landfills; 3) when the content of sulphoaluminate cement was more than 50%, the unconfined compressive strength of solidified sludge with curing age of 28 days after being immersed for 28 days could meet the landfill requirement of 50 kPa;4) C-S-H gel with cementing effect produced by the addition of sulphoaluminate cement caused the microstructure of the sludge to be more compact, which was the micro-control mechanism for the strength enhancement of sludge in sulphoaluminate cement solidified leachate with high salt content; 5) the soluble salt sludge particles in the sample solidified by sulphoaluminate cement gradually dissolved with the increase of immersion time, which led to the fracture and dispersion of C-S-H gel and the destruction of micro-cementing morphology, it was the micro-control mechanism for the immersion deterioration of sulphoaluminate cement solidified high-salt leachate sludge.
- sludge with leachate,
- extremely high salinity content,
- cured stabilization,
- micro-control mechanism,
- water stability

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References

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