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<p>Fenton Iron Sludge (FIS) was used to enhance the anaerobic digestion performance of actual papermaking wastewater (PW), and the impact of FIS on the physicochemical properties of granular sludge was elucidated in this study. The experiment results indicated the addition of FIS increased the soluble chemical oxygen demand (SCOD) removal efficiency by 11.77% and the methane production by 15.13% under high organic load. The concentration of electrochemically active substances in the extracellular polymeric substances (EPS) was increased by adding FIS. Loosely bound extracellular polymeric substances (LB-EPS) and tightly bound extracellular polymeric substances (TB-EPS) in the experimental group exhibited 1.15 and 1.17 times increases in electron transport capabilities compared to the control group. In the hydrolysis experiment, the protein removal efficiency increased by 10.5%, and in the acidification experiment, the concentration of acetic acid increased by 37.7%. This indicated that FIS significantly promoted the hydrolysis and acidification process of anaerobic digestion, thereby enhancing the anaerobic digestion performance of the actual PW.</p>

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Influence of Fenton iron sludge on anaerobic digestion and extracellular polymeric substances of anaerobic granular sludge

  • 期刊论文

  • 发表日期：

    2025年12月18日

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  • Xianbao Wang,
  • Baisha Song,
  • Yili Xie,
  • Xiyu Liu,
  • Jinlei Cheng,
  • Tiantian Chen,
  • Anlong Zhang

摘要

Fenton Iron Sludge (FIS) was used to enhance the anaerobic digestion performance of actual papermaking wastewater (PW), and the impact of FIS on the physicochemical properties of granular sludge was elucidated in this study. The experiment results indicated the addition of FIS increased the soluble chemical oxygen demand (SCOD) removal efficiency by 11.77% and the methane production by 15.13% under high organic load. The concentration of electrochemically active substances in the extracellular polymeric substances (EPS) was increased by adding FIS. Loosely bound extracellular polymeric substances (LB-EPS) and tightly bound extracellular polymeric substances (TB-EPS) in the experimental group exhibited 1.15 and 1.17 times increases in electron transport capabilities compared to the control group. In the hydrolysis experiment, the protein removal efficiency increased by 10.5%, and in the acidification experiment, the concentration of acetic acid increased by 37.7%. This indicated that FIS significantly promoted the hydrolysis and acidification process of anaerobic digestion, thereby enhancing the anaerobic digestion performance of the actual PW.