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The study proposed the extent and possible mechanisms of zero valent iron (ZVI) pretreatment on the generation of short-chain fatty acids (SCFAs) in alkaliphilic anaerobic fermentation of OTC-containing excess sludge at first. The results indicated that ZVI increased SCFAs yields. The SCFAs production reached 1523.12 ± 7.8 mg COD/g VSS at 20 g/L of ZVI addition, which increased by 62.70% (Day 6). The extra-cellular polymeric substances (EPS) and interior sludge cells was destructed by the speed of ZVI. The enrichment of hydrolytic acidifying bacteria was more favorable when ZVI was added at 20 g/L, and Bacillus, Hydrotalea and Thauera have become the main dominant species. Meanwhile, Pseudomonas was a potential oxytetracycline-degrading bacterium. In conclusion, the ZVI pre-treatment successfully improved acid production and pollutant removal in the OTC-containing excess sludge, achieving the dual benefits of sludge recycling and pollutant reduction.

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Performance of Zero-Valent Iron Enhancing Short-Chain Fatty Acids Production During Alkaliphilic Anaerobic Fermentation of OTC-Containing Excess Sludge

  • 会议论文

  • 发表日期：

    2025年

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  • Yunxia Wang,
  • Yongzhi Chen

摘要

The study proposed the extent and possible mechanisms of zero valent iron (ZVI) pretreatment on the generation of short-chain fatty acids (SCFAs) in alkaliphilic anaerobic fermentation of OTC-containing excess sludge at first. The results indicated that ZVI increased SCFAs yields. The SCFAs production reached 1523.12 ± 7.8 mg COD/g VSS at 20 g/L of ZVI addition, which increased by 62.70% (Day 6). The extra-cellular polymeric substances (EPS) and interior sludge cells was destructed by the speed of ZVI. The enrichment of hydrolytic acidifying bacteria was more favorable when ZVI was added at 20 g/L, and Bacillus, Hydrotalea and Thauera have become the main dominant species. Meanwhile, Pseudomonas was a potential oxytetracycline-degrading bacterium. In conclusion, the ZVI pre-treatment successfully improved acid production and pollutant removal in the OTC-containing excess sludge, achieving the dual benefits of sludge recycling and pollutant reduction.