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<p>Anaerobic digestion (AD) of organic wastes is an effective way to get environment friendly and renewable bioenergy, but over-acid caused by the accumulation of volatile fatty acids (VFAs) always had serious negative impact to the normal operation of digestion system. Different conductive materials, nano-scale zero-valent iron (NZVI), powder activated carbon (PAC) and NZVI—PAC micro-electrolysis (ICME), were added to investigate the augmentation performance on maize stover AD. The results showed that conductive materials have positive influence on biogas production and VFAs biotransformation, especially for propanoic acid. The maximum total biogas yield of 1389&#xa0;ml was achieved by ICME in near neutral environment with a pH of 6.34. Propionic acid showed the strongest inhibitory effect in VFAs, with relative contents of 47.72%, 35.95%, 31.14%, and 30.42% in the control, PAC, NZVI, and ICME-enhanced groups, respectively. A modified Gompertz and Logistic function model were used to determine kinetic constants of conductive materials augmentation on maize stover AD.</p> Graphical Abstract <p></p>

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Augmentation Comparison of Conductive Materials for Methane Production and Volatile Fatty Acids (VFAs) Biotransformation of Maize Stover

  • 期刊论文

  • 发表日期：

    2026年7月23日

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  • Qiaoyan Li,
  • Ruizhe Feng,
  • Huanguang Deng,
  • Ju Zhang,
  • Yongfeng Li

摘要

Anaerobic digestion (AD) of organic wastes is an effective way to get environment friendly and renewable bioenergy, but over-acid caused by the accumulation of volatile fatty acids (VFAs) always had serious negative impact to the normal operation of digestion system. Different conductive materials, nano-scale zero-valent iron (NZVI), powder activated carbon (PAC) and NZVI—PAC micro-electrolysis (ICME), were added to investigate the augmentation performance on maize stover AD. The results showed that conductive materials have positive influence on biogas production and VFAs biotransformation, especially for propanoic acid. The maximum total biogas yield of 1389 ml was achieved by ICME in near neutral environment with a pH of 6.34. Propionic acid showed the strongest inhibitory effect in VFAs, with relative contents of 47.72%, 35.95%, 31.14%, and 30.42% in the control, PAC, NZVI, and ICME-enhanced groups, respectively. A modified Gompertz and Logistic function model were used to determine kinetic constants of conductive materials augmentation on maize stover AD.

Graphical Abstract