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<p>The screening of four types of fillers—polyurethane suspension filler, polyhedral hollow sphere polypropylene filler, porous polyethylene filler, and combined fiber fillers—was conducted in a sequencing batch biofilm reactor (SBBR) system to evaluate their effects on denitrification performance, with batch experiments assessing film formation and the removal of COD, NH<sub>4</sub><sup>+</sup>-N, and TN. The results demonstrated that although all fillers exhibited high COD removal efficiency, with an average removal rate consistently above 80%, significant differences were observed in the removal of NH<sub>4</sub>⁺-N and TN among the fillers. The combined fiber filler achieved average removal rates of 84.04% for NH<sub>4</sub><sup>+</sup>-N and 81.02% for TN, demonstrating significantly better overall nitrogen removal efficiency compared to the other fillers. Analysis of pollutant removal during typical cycles further corroborated that the combined fiber and polyethylene filler system maintained higher denitrification performance over time. Moreover, these fillers provided a favorable habitat for key microorganisms, such as <i>Proteobacteria</i>, <i>Bacteroidetes</i>, and <i>Thauera</i>, supporting their growth and enhancing microbial community diversity.</p>

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Exploring the Effects of Different Fillers on the Treatment of Wastewater by SBBR System: Denitrification Efficiency and Microbial Community

  • 期刊论文

  • 发表日期：

    2025年7月17日

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  • Shuli Liu,
  • Xiaohong Han,
  • Miao Zhou,
  • Yatong Gao,
  • Yuhong Zhang,
  • Qi Li,
  • Ning Guo,
  • Jiajun Hua,
  • Jia Kang,
  • Gangfu Song

摘要

The screening of four types of fillers—polyurethane suspension filler, polyhedral hollow sphere polypropylene filler, porous polyethylene filler, and combined fiber fillers—was conducted in a sequencing batch biofilm reactor (SBBR) system to evaluate their effects on denitrification performance, with batch experiments assessing film formation and the removal of COD, NH4+-N, and TN. The results demonstrated that although all fillers exhibited high COD removal efficiency, with an average removal rate consistently above 80%, significant differences were observed in the removal of NH4⁺-N and TN among the fillers. The combined fiber filler achieved average removal rates of 84.04% for NH4+-N and 81.02% for TN, demonstrating significantly better overall nitrogen removal efficiency compared to the other fillers. Analysis of pollutant removal during typical cycles further corroborated that the combined fiber and polyethylene filler system maintained higher denitrification performance over time. Moreover, these fillers provided a favorable habitat for key microorganisms, such as Proteobacteria, Bacteroidetes, and Thauera, supporting their growth and enhancing microbial community diversity.