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Enhancement of Anaerobic Digestion from Food Waste via Ultrafine Wet Milling Pretreatment: Simulation, Performance, and Mechanisms

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  • Zongsheng Li

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

  • Xiupeng Jiang

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

  • Wenjie Shi

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

  • Dongye Yang

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

  • Youcai Zhao

    (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)

  • Tao Zhou

    (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)

Abstract

Particle size reduction is a commonly used pretreatment technique to promote methane production from anaerobic digestion (AD) of food waste (FW). However, limited research has focused on the effect of micron-sized particles on AD of FW. This research presented an ultrafine wet milling (UFWM) pretreatment method to reduce the particle size of FW particles. After four hours of milling, D90 was reduced to 73 μm and cumulative methane production boosted from 307.98 mL/g vs. to 406.75 mL/g vs. without ammonia inhibition. We evaluated the performance of the AD systems and explored their facilitation mechanisms. Kinetic analysis showed that the modified Gompertz model predicted experimental values most accurately. UFWM pretreatment increased the maximum methane production rate by 44.4% and reduced the lag time by 0.65 days. The mechanical stress and collisions of milling resulted in a scaly surface of the particles, which greatly increased the voids and surface area. A rise in the XPS peak area of the C–N and C=O bonds proved the promotion of the liberation of carbohydrates and fats. Further microbial community analysis revealed that the relative abundance of Bacteroidota and Methanosarcina were enriched by UFWM. Meanwhile, methane metabolism pathway analysis confirmed that module M00567, module M00357, and related enzymes were stimulated. This study provided a theoretical basis for UFWM pretreatment applications and improvements in AD of FW.

Suggested Citation

  • Zongsheng Li & Xiupeng Jiang & Wenjie Shi & Dongye Yang & Youcai Zhao & Tao Zhou, 2024. "Enhancement of Anaerobic Digestion from Food Waste via Ultrafine Wet Milling Pretreatment: Simulation, Performance, and Mechanisms," Sustainability, MDPI, vol. 16(7), pages 1-19, April.
    • Handle: RePEc:gam:jsusta:v:16:y:2024:i:7:p:2933-:d:1368532
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    References listed on IDEAS

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    2. Liu, Quan & Zhang, Guanyu & Kong, Ge & Liu, Mingyang & Cao, Tianqi & Guo, Zhirui & Zhang, Xuesong & Han, Lujia, 2023. "Valorizing manure waste into green coal-like hydrochar: Parameters study, physicochemical characteristics, combustion behaviors and kinetics," Renewable Energy, Elsevier, vol. 216(C).
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    4. Hidalgo, D. & Castro, J. & Díez, D. & Martín-Marroquín, J.M. & Gómez, M. & Pérez, E., 2023. "Torrefaction at low temperature as a promising pretreatment of lignocellulosic biomass in anaerobic digestion," Energy, Elsevier, vol. 263(PC).
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