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<p>When using seasonal or highly degradable feedstocks, effective storage of raw materials is crucial to ensure stable year-round operation of anaerobic digesters. However, the impact of straw feedstock exposed to open-air conditions on biogas production and anaerobic digestion (AD) remains uncertain. This research investigates the effects of corn stover stored in various stages of decomposition under open-air conditions on AD systems, analyzing biogas yield, physiochemical parameters, and microbial communities. Gas production, both daily and total, ranked highest to lowest as follows: 19DS (air-dried for one year) &gt; 20NS (fresh) &gt; 19FS (fermented) &gt; 19MS (moldy) &gt; 19RS (rotten). A linear correlation was observed between cellulose, hemicellulose in lignocellulosic materials, and gas production. Systems 19DS and 20NS displayed rapid substance conversion (sCOD), high concentrations of acetic acid or propionic acid, and good buffering capacity. Bacterial communities associated with biogas production across different treatments. Fibrobacterota contributes to feedstock conversion in 19MS, 19DS, and 19FS. The findings emphasize the importance of adequately conserving corn stover in large-scale AD operations to prevent cellulose and hemicellulose degradation, thereby ensuring stable system performance. Even when dealing with degraded feedstock, subsequently subjecting the raw materials to lactic acid fermentation.</p>

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Effects of large-scale open-air storage of corn stover on biogas production and anaerobic digestion

  • 期刊论文

  • 发表日期：

    2026年5月14日

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  • Shuoye Wang,
  • Tong Shen,
  • Hao Wu,
  • Peng Chen,
  • Song Liu,
  • Zongjun Cui,
  • Hongyan Yang

摘要

When using seasonal or highly degradable feedstocks, effective storage of raw materials is crucial to ensure stable year-round operation of anaerobic digesters. However, the impact of straw feedstock exposed to open-air conditions on biogas production and anaerobic digestion (AD) remains uncertain. This research investigates the effects of corn stover stored in various stages of decomposition under open-air conditions on AD systems, analyzing biogas yield, physiochemical parameters, and microbial communities. Gas production, both daily and total, ranked highest to lowest as follows: 19DS (air-dried for one year) > 20NS (fresh) > 19FS (fermented) > 19MS (moldy) > 19RS (rotten). A linear correlation was observed between cellulose, hemicellulose in lignocellulosic materials, and gas production. Systems 19DS and 20NS displayed rapid substance conversion (sCOD), high concentrations of acetic acid or propionic acid, and good buffering capacity. Bacterial communities associated with biogas production across different treatments. Fibrobacterota contributes to feedstock conversion in 19MS, 19DS, and 19FS. The findings emphasize the importance of adequately conserving corn stover in large-scale AD operations to prevent cellulose and hemicellulose degradation, thereby ensuring stable system performance. Even when dealing with degraded feedstock, subsequently subjecting the raw materials to lactic acid fermentation.