首页|Rheological properties of food waste and micron-scale particle strategies for enhancing mixing performance in anaerobic digestion: Insights into rheology and numerical simulation

Rheological properties of food waste and micron-scale particle strategies for enhancing mixing performance in anaerobic digestion: Insights into rheology and numerical simulation

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  • NETL
  • NSTL
  • Elsevier
The rheological properties of food waste (FW) have emerged as a pivotal bottleneck impeding the stable operation and mixing performance of anaerobic digestion systems. This work systematically evaluated the rheological properties of FW and integrated computational fluid dynamics (CFD) numerical simulation to investigate the mixing performance of high-solid FW with micron-scale particle sizes. Results demonstrated that typical FW exhibited shear-thinning characteristics, and the rheological behavior of high-solid FW aligned with the Herschel-Bulkley model. The investigation of influencing factors indicated that reducing total solids, increasing temperature, and decreasing particle size could substantially decrease FW viscosity. Simultaneously, organic components exerted significant regulatory effects on the rheological properties. Starch and animal proteins markedly enhanced the viscosity and consistency, while lipids and legume proteins decreased viscosity and enhanced fluidity. A quantitative relationship between the consistency coefficient and organic components of FW was established. CFD simulations revealed that micron-sized particles effectively improved flow field distribution, reducing the dead zone ratio by 3.7 % and lowering the UI from 0.673 to 0.608. This work investigated the rheological properties of FW and the mixing performance of anaerobic digestion systems from a rheological perspective. The aim is to overcome efficiency and stability bottlenecks, thereby offering engineering guidance for optimizing anaerobic digestion processes and enhancing the resource recovery of municipal solid waste.

ViscosityThixotropyHigh-solid anaerobic digestionOrganic componentsYield-pseudoplastic

Xu Xing、Zongsheng Li、Chenzhi He、Yanyan Guo、Guofang Zhang、Youcai Zhao、Tao Zhou

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The State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai, 200092, China

The State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai, 200092, China||Jiangsu Environmental Engineering Technology Co., Ltd, Nanjing, 210019, Jiangsu, China

Shanghai Urban Development Research Institute Co., Ltd, Shanghai, 200030, China

The State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai, 200092, China||Shanghai Institute of Pollution Control and Ecological Security, 1515 North Zhongshan Rd. (No. 2), Shanghai, 200092, China||Tianfu Yongxing Laboratory, Chengdu, 610213, China

The State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai, 200092, China||Shanghai Institute of Pollution Control and Ecological Security, 1515 North Zhongshan Rd. (No. 2), Shanghai, 200092, China

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2025

10.1016/j.envres.2025.121699

Environmental research

Environmental research

SCI
ISSN：0013-9351
年,卷(期)：2025.279(Pt.1)
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