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Title
Japanese: 
English:The application of freeze-thaw cycle treatment on landfill sludge: Impact on physicochemical properties and physical-mechanical characteristics 
Author
Japanese: Ye Peng, 藤井 学, Kondoh Gen.  
English: Peng Ye, Manabu Fujii, Gen Kondo.  
Language English 
Journal/Book name
Japanese: 
English:Journal of Cleaner Production 
Volume, Number, Page Vol. 468       
Published date Aug. 2024 
Publisher
Japanese: 
English: 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
DOI https://doi.org/10.1016/j.jclepro.2024.143106
Abstract The physical-mechanical properties of dewatered sludge are important for the stability of landfills and their resource utilization. In this study, the physical-mechanical properties of sludge were comprehensively investigated by considering its various properties (e.g., particle morphology and size, compression and consolidation characteristics, shear strength, dewatering capacity, and microstructure) under different freeze-thaw cycles. The results indicated that extracellular polymers (EPS) will be destroyed during freeze-thaw cycles, and bound and interstitial water are converted to free water, which also enhances the sludge's dewatering efficiency and strength. Furthermore, multiple freeze-thaw cycles significantly enhanced the consolidation efficiency, leading to a denser sludge cake under pressure. A dense sludge structure enhances particle interlocking, improving internal friction angle and shear strength. The highest treatment efficiency was observed after 1?3 freeze-thaw cycles. Sludge properties tend to be stable when the freeze-thaw cycles are over 6. The research results will provide a reference for sludge dewatering reduction and its resource utilization.

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