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Material Destination and Filtrate Recycling and Reuse in the Flocculation-Dehydration-Solidification Treatment of Waste Soil
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Zhi-hao HAN1, 2, 3, Ming ZHANG4, 5, 6, Xiao-hui SUN1, 2, 3, *, Chang-qing CHEN5, 6, Si-lin WU7, Fo-ci CHEN5, 6, Zi-jun DONG1, 2, 3
Science Technology and Engineering | 2025, 25(22) : 9604 - 9612
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Science Technology and Engineering | 2025, 25(22): 9604-9612
• Papers·Environmental and Safe Science •
Material Destination and Filtrate Recycling and Reuse in the Flocculation-Dehydration-Solidification Treatment of Waste Soil
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Zhi-hao HAN1, 2, 3, Ming ZHANG4, 5, 6, Xiao-hui SUN1, 2, 3, *, Chang-qing CHEN5, 6, Si-lin WU7, Fo-ci CHEN5, 6, Zi-jun DONG1, 2, 3
Affiliations
  • 1 College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, China
  • 2 State Key Laboratory of Intelligent Geotechnics and Tunnelling, Shenzhen 518060, China
  • 3 Shenzhen Key Laboratory of Green, Efficient, and Intelligent Construction of Underground Metro Station, Shenzhen 518060, China
  • 4 China State Construction International Holdings Limited, Hong Kong 999077, China
  • 5 China State Construction Engineering(Hong Kong) Limited, Hong Kong 999077, China
  • 6 China State Civil Engineering Ltd., Hong Kong 999077, China
  • 7 School of Architecture and Civil Engineering, Jiangsu University of Science and Technology, Zhenjiang 212000, China
Published: 2025-08-08 doi: 10.12404/j.issn.1671-1815.2408694
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FDS(flocculation-dehydration-solidification) coupling process has been proven to significantly enhance the efficiency of resource conversion in engineering waste soil. However, the material fate within the process and the advantages of recycling press-filter filtrate remain to be further investigated. FDS experiments were conducted to analyze the material fate of each component in the flocculant-solidifying agent during the FDS process. Based on the findings, the potential benefits of recycling press-filter filtrate were explored. The results reveal that approximately 18% to 35.57% of Na+ and 0.1% to 0.56% of Si elements are detected in the press-filter filtrate, whereas Ca, Mg, and Al elements primarily remained in the filter cake, with proportions close to or equal to 100%. The recycling of highly alkaline press-filter filtrate into the process is found to not only improve the dissociation efficiency of mud and sand but also serve as a “pretreatment” for subsequent FDS stages. Waste soil particles are observed to adsorb residual materials from the filtrate, enabling dynamic adjustments in material dosage according to material transformation patterns and filter cake performance requirements. This approach ensures that materials lost in the filtrate are continuously recycled and utilized, maintaining a dynamic circular process.

flocculation-dehydration-solidification  /  material fate  /  alkaline filtrate  /  filtrate recycling
Zhi-hao HAN, Ming ZHANG, Xiao-hui SUN, Chang-qing CHEN, Si-lin WU, Fo-ci CHEN, Zi-jun DONG. Material Destination and Filtrate Recycling and Reuse in the Flocculation-Dehydration-Solidification Treatment of Waste Soil[J]. Science Technology and Engineering, 2025 , 25 (22) : 9604 -9612 . DOI: 10.12404/j.issn.1671-1815.2408694
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Year 2025 volume 25 Issue 22
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Article Info
doi: 10.12404/j.issn.1671-1815.2408694
  • Receive Date：2024-11-21
  • Online Date：2026-02-11
  • Published：2025-08-08
Article Data
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History
  • Received：2024-11-21
  • Revised：2025-05-16
Funding
Affiliations
    1 College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, China
    2 State Key Laboratory of Intelligent Geotechnics and Tunnelling, Shenzhen 518060, China
    3 Shenzhen Key Laboratory of Green, Efficient, and Intelligent Construction of Underground Metro Station, Shenzhen 518060, China
    4 China State Construction International Holdings Limited, Hong Kong 999077, China
    5 China State Construction Engineering(Hong Kong) Limited, Hong Kong 999077, China
    6 China State Civil Engineering Ltd., Hong Kong 999077, China
    7 School of Architecture and Civil Engineering, Jiangsu University of Science and Technology, Zhenjiang 212000, China
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表12种不同金属材料的力学参数
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小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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