DEHYDRATION PERFORMANCE OF SLUDGE DURING FREEZE-THAW CYCLE AND ANALYSIS BASED ON COMSOL MULTIPHYSICS HYDROTHERMAL COUPLING

GUO Zirui; CHI Riguang; XIN Hailong; GONG Xujin; PENG Zhaoyang; CHEN Zhiqiang

doi:10.13205/j.hjgc.202412021

Volume 42 Issue 12

Dec. 2024

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2024 > 42(12): 174-183

GUO Zirui, CHI Riguang, XIN Hailong, GONG Xujin, PENG Zhaoyang, CHEN Zhiqiang. DEHYDRATION PERFORMANCE OF SLUDGE DURING FREEZE-THAW CYCLE AND ANALYSIS BASED ON COMSOL MULTIPHYSICS HYDROTHERMAL COUPLING[J]. ENVIRONMENTAL ENGINEERING , 2024, 42(12): 174-183. doi: 10.13205/j.hjgc.202412021

Citation:

GUO Zirui, CHI Riguang, XIN Hailong, GONG Xujin, PENG Zhaoyang, CHEN Zhiqiang. DEHYDRATION PERFORMANCE OF SLUDGE DURING FREEZE-THAW CYCLE AND ANALYSIS BASED ON COMSOL MULTIPHYSICS HYDROTHERMAL COUPLING[J]. ENVIRONMENTAL ENGINEERING , 2024, 42(12): 174-183. doi: 10.13205/j.hjgc.202412021

Citation:

GUO Zirui, CHI Riguang, XIN Hailong, GONG Xujin, PENG Zhaoyang, CHEN Zhiqiang. DEHYDRATION PERFORMANCE OF SLUDGE DURING FREEZE-THAW CYCLE AND ANALYSIS BASED ON COMSOL MULTIPHYSICS HYDROTHERMAL COUPLING[J]. ENVIRONMENTAL ENGINEERING , 2024, 42(12): 174-183. doi: 10.13205/j.hjgc.202412021

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DEHYDRATION PERFORMANCE OF SLUDGE DURING FREEZE-THAW CYCLE AND ANALYSIS BASED ON COMSOL MULTIPHYSICS HYDROTHERMAL COUPLING

doi: 10.13205/j.hjgc.202412021

1. School of Energy and Civil Engineering, Harbin University of Commerce, Harbin 150023, China;
2. The Architectural Design and Research Institute of HIT Co., Ltd., Harbin 150090, China;
3. State Key Laboratory of Urban Water Resources and Water Environment, Harbin Institute of Technology, Harbin 150090, China

Received Date: 2023-12-01
Available Online: 2025-01-18

Abstract

Abstract

Sludge is slowly frozen and then thawed, which usually greatly improves the dewatering performance of the sludge. In this paper, the dewatering effect of urban sludge was investigated based on the freeze-thaw cycle method. The response surface method was used, taking the sludge freeze-thaw temperature (℃), freeze-thaw duration (h), and freeze-thaw time (n) as the dependent variables, and the sludge moisture content (%) as the response value, and a mathematical model was established by the Box-Behnken central combination design method. The results showed that when the freeze-thaw temperature was -16.30 ℃, the freeze-thaw time was 19.70 h, and freeze-thaw for 19 cycles, the minimum sludge moisture content predicted by the model was 33.93%, and the model R²>0.99, indicating that the response surface method was feasible to optimize the physical and chemical properties of the regulated sludge during the freeze-thaw cycle to improve its dewatering performance. The hydrothermal process inside the sludge is an important factor affecting the utilization of sludge and water resources. The traditional hydrothermal coupling model ignores the water’s effect on heat transfer in the unsaturated medium, and it is still difficult to realize the numerical value of the coupling theoretical model between the water field and temperature field. The sludge freeze-thaw cycle model was established through the finite element simulation software. Based on the experimental data, the coupling of ice-water phase transition and partial differential equation of water convection was solved, and the relationship between sludge water convection and temperature change was analyzed. The microstructure and pore changes of sludge flocs was analyzed by scanning electron microscope (SEM). It provides a basis for freeze-thaw treatment in optimizing sludge dewatering performance. The results show that COMSOL software can realize flexible definitions of sludge and hydrothermal parameters, ice water phase change latent heat and boundary conditions, and can realize hydrothermal field coupling analysis.
- municipal sludge,
- freeze-thaw cycle,
- dehydration performance,
- response surface,
- COMSOL Multiphysics,
- hydrothermal coupling analysis

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References(25)

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