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<p>Rapid expansion of industrial pig farming has intensified existing challenges in the management of nutrient-rich wastewater, characterized by high organic loads (chemical oxygen demand (COD): 15,000–30,000&#xa0;mg/L)&#xa0;and ammonium nitrogen (NH<sub>4</sub><sup>+</sup>-N): 800–2,500&#xa0;mg/L)&#xa0;concentrations. In this study, an integrated treatment system with a combination of a high-density polyethylene (HDPE) membrane-based anaerobic membrane bioreactor and an anoxic/aerobic/oxidation pond (A<sup>2</sup>/O) was developed for swine wastewater remediation. The system achieved exceptional remediation efficiency, removing 99.4, 99.5, 95.4,&#xa0;92.8, and&#xa0;97.9% of COD, biochemical oxygen demand (BOD), NH<sub>4</sub><sup>+</sup>-N, total phosphorus (TP), and suspended solids (SS), respectively, with the anoxic and aerobic (A<sup>2</sup>) phases contributing to removal of 62.5,&#xa0;60.9, 80.9, 94.6% of COD,&#xa0;BOD, TP, and SS,&#xa0;respectively. Microbial community analysis revealed process-specific dynamics, including Firmicutes enrichment (8.52 ± 3.33 to 10.81 ± 0.39%) in anaerobic stages and <i>Nitrosomonas</i> dominance (2.38 ± 0.21%) during nitrification. The HDPE membrane-based bioreactor performed effectively under high organic loading rates (5–8&#xa0;kg COD·m<sup>–3</sup>·day<sup>–1</sup>), whereas the A<sup>2</sup>/O system optimized nutrient cycling through synchronized nitrification-denitrification (dissolved oxygen: 2.0–3.5&#xa0;mg/L). In this study, we establish a scalable framework for the treatment of industrial swine wastewater by combining engineered infrastructure with the principles of microbial ecology to address conventional pollutants.</p>

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Deciphering nitrogen-driven microbial succession in an anaerobic membrane bioreactor-coupled A2/O ecological system for the remediation of industrial swine wastewater

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年8月4日

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  • Jing Huang,
  • Feilong Wu,
  • Yanchun Xiao,
  • Meifeng Ye,
  • Xiaomei Wu,
  • Han Chen,
  • Qingxian Xu

摘要

Rapid expansion of industrial pig farming has intensified existing challenges in the management of nutrient-rich wastewater, characterized by high organic loads (chemical oxygen demand (COD): 15,000–30,000 mg/L) and ammonium nitrogen (NH4+-N): 800–2,500 mg/L) concentrations. In this study, an integrated treatment system with a combination of a high-density polyethylene (HDPE) membrane-based anaerobic membrane bioreactor and an anoxic/aerobic/oxidation pond (A2/O) was developed for swine wastewater remediation. The system achieved exceptional remediation efficiency, removing 99.4, 99.5, 95.4, 92.8, and 97.9% of COD, biochemical oxygen demand (BOD), NH4+-N, total phosphorus (TP), and suspended solids (SS), respectively, with the anoxic and aerobic (A2) phases contributing to removal of 62.5, 60.9, 80.9, 94.6% of COD, BOD, TP, and SS, respectively. Microbial community analysis revealed process-specific dynamics, including Firmicutes enrichment (8.52 ± 3.33 to 10.81 ± 0.39%) in anaerobic stages and Nitrosomonas dominance (2.38 ± 0.21%) during nitrification. The HDPE membrane-based bioreactor performed effectively under high organic loading rates (5–8 kg COD·m–3·day–1), whereas the A2/O system optimized nutrient cycling through synchronized nitrification-denitrification (dissolved oxygen: 2.0–3.5 mg/L). In this study, we establish a scalable framework for the treatment of industrial swine wastewater by combining engineered infrastructure with the principles of microbial ecology to address conventional pollutants.