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<p>Lignin is a structurally complex biopolymer and a major byproduct of biomass processing, which remains underutilized due to its recalcitrance. This study presents an electrochemical in situ method for the conversion of Kraft lignin (KL) into ferulic acid using a Microbial Electrochemical Cell (MEC). In this system, bacteria at the anolyte generate electrons that are transferred to the catholyte, promoting the in situ production of hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>) at the catholyte. The generated H<sub>2</sub>O<sub>2</sub> drives the oxidative depolymerization of lignin, leading to the formation of ferulic acid. The MEC system demonstrated an 88% reduction in chemical oxygen demand (COD), confirming substantial lignin oxidation. Additionally, the system produced a power output of 253 ± 0.07&#xa0;mV and 27.86 ± 0.39&#xa0;mM of H<sub>2</sub>O<sub>2</sub>. In a reaction system containing 0.5&#xa0;g of KL in 100&#xa0;ml was added respectively, lignin was successfully oxidized to ferulic acid. The downstream recovery process utilized ultrafiltration membranes, achieving a yield of 130&#xa0;mg/g of KL, with a final concentration of 2034.44&#xa0;mg/l and a purity of 95.95%. This integrated MEC and ultrafiltration approach provides an efficient, eco-friendly, and scalable method for the valorization of lignin into high-value compounds such as ferulic acid. The study demonstrates the potential for combining microbial electrochemical systems with membrane filtration to develop sustainable processes for bio-based chemical production, contributing to the advancement of lignin valorization technologies.</p>

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Microbial electrochemical in situ conversion of kraft lignin into ferulic acid and its recovery

  • 期刊论文

  • 发表日期：

    2025年2月24日

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  • Swati Chandrawanshi,
  • Changsomba Chang,
  • Pratima Gupta

摘要

Lignin is a structurally complex biopolymer and a major byproduct of biomass processing, which remains underutilized due to its recalcitrance. This study presents an electrochemical in situ method for the conversion of Kraft lignin (KL) into ferulic acid using a Microbial Electrochemical Cell (MEC). In this system, bacteria at the anolyte generate electrons that are transferred to the catholyte, promoting the in situ production of hydrogen peroxide (H2O2) at the catholyte. The generated H2O2 drives the oxidative depolymerization of lignin, leading to the formation of ferulic acid. The MEC system demonstrated an 88% reduction in chemical oxygen demand (COD), confirming substantial lignin oxidation. Additionally, the system produced a power output of 253 ± 0.07 mV and 27.86 ± 0.39 mM of H2O2. In a reaction system containing 0.5 g of KL in 100 ml was added respectively, lignin was successfully oxidized to ferulic acid. The downstream recovery process utilized ultrafiltration membranes, achieving a yield of 130 mg/g of KL, with a final concentration of 2034.44 mg/l and a purity of 95.95%. This integrated MEC and ultrafiltration approach provides an efficient, eco-friendly, and scalable method for the valorization of lignin into high-value compounds such as ferulic acid. The study demonstrates the potential for combining microbial electrochemical systems with membrane filtration to develop sustainable processes for bio-based chemical production, contributing to the advancement of lignin valorization technologies.