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Impact of Tween-80 modified foam iron combined with spatial magnetic field on methane production from medicinal herb residues in anaerobic digestion

Author

Listed:
  • Yang, Zheng
  • Zhao, Bo
  • Cao, Shengxian
  • Dong, Zheng
  • Wang, Gong
  • Song, Zijian
  • Yuan, Ankai
  • Wang, Shi
  • Wang, Yongli
  • Ma, Yue

Abstract

This study investigated the impact of non-ionic surfactant (Tween-80) modified foam iron combined with a spatial magnetic field (T80-FI + SMF) on methane production during the anaerobic digestion of trichosanthes kirilowii pericarp residue. Using single-factor experiments and Box-Behnken design optimization, the optimal process conditions were determined as follows: a modified foam iron dosage of 2.9 g/L, a Tween-80 modification concentration of 8.3 g/L, and a spatial magnetic field intensity of 14.4 mT. Mechanistic analysis revealed that T80-FI + SMF effectively increased the concentrations of volatile fatty acids, iron ions, and cytochrome C, facilitated metabolic balance between Methanosarcinales and Geobacterales. This promoted efficient direct interspecies electron transfer and maintained a dynamic equilibrium between Fe2+ and Fe3+, leading to a rapid methane production peak. As a result, the cumulative methane yield reached 642.3 ± 13.7 mL/g VS, representing a significant 33.2 % increase compared to the control group. In semi-continuous mode, the maximum organic loading rate improved from 2.0 to 2.67 g VS/L/d. The energy conversion efficiency reached 75.6 %, with a payback period of 6.39 years. This study offers a novel technological pathway for the resource-efficient treatment of organic waste and enhanced methane production.

Suggested Citation

  • Yang, Zheng & Zhao, Bo & Cao, Shengxian & Dong, Zheng & Wang, Gong & Song, Zijian & Yuan, Ankai & Wang, Shi & Wang, Yongli & Ma, Yue, 2026. "Impact of Tween-80 modified foam iron combined with spatial magnetic field on methane production from medicinal herb residues in anaerobic digestion," Renewable Energy, Elsevier, vol. 256(PH).
    • Handle: RePEc:eee:renene:v:256:y:2026:i:ph:s0960148125022980
    DOI: 10.1016/j.renene.2025.124634
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    References listed on IDEAS

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    1. Dar, Rouf Ahmad & Tsui, To-Hung & Zhang, Le & Smoliński, Adam & Tong, Yen Wah & Mohamed Rasmey, Abdel-Hamied & Liu, Ronghou, 2025. "Recent achievements in magnetic-field-assisted anaerobic digestion for bioenergy production," Renewable and Sustainable Energy Reviews, Elsevier, vol. 207(C).
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