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<p>Livestock and poultry breeding wastewaters (LPBWs) is dumped into rivers either untreated or with inadequate treatment, which causes major pollution issues. This study explores a high-efficiency, low-energy treatment method for livestock and poultry breeding wastewater, focusing on the use of Constructed Wetland-Microbial Fuel Cell technology (CW-MFC). The study showed that the removal rates of COD, NH<sub>4</sub><sup>+</sup>-N, and PO<sub>4</sub><sup>3−</sup>-P through the multistage tandem system reached 77.32%, 95.97%, and 92.72%, respectively. The study revealed that substrate layers significantly influence microbial community composition, with <i>Clostridium_sensu_stricto_1</i>, <i>unclassified_ Rhizobiales</i>, and <i>Micropruina</i> being primarily enriched in all layers. It can be concluded that microbial metabolism is the primary mechanism of pollution elimination based on the KEGG signaling analysis of PICRUSt2 metabolic pathway 1. The COD removal was dependent on microbial autotrophic carbon fixation reactions; the NH<sub>4</sub><sup>+</sup>-N removal was attributed to the up-regulation of nitrification–denitrification genes; and the PO<sub>4</sub><sup>3−</sup>-P removal was dependent on the microbial production of transferase enzymes substituting for phosphoryl groups that converted them to hypophosphite products. This study aims to enhance CW-MFC wastewater treatment for livestock and poultry, improve pollutant removal efficiency, and establish a foundation for future research and practical application.</p>

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Treatment of Livestock and Poultry Breeding Wastewater by Multistage Series System: Pollutant Removal Efficiency and Mechanism

  • 期刊论文

  • 发表日期：

    2025年3月12日

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  • Yuke Fan,
  • Wenying Qu,
  • Xiangchun Li,
  • Shenglin Liu,
  • Junfeng Li

摘要

Livestock and poultry breeding wastewaters (LPBWs) is dumped into rivers either untreated or with inadequate treatment, which causes major pollution issues. This study explores a high-efficiency, low-energy treatment method for livestock and poultry breeding wastewater, focusing on the use of Constructed Wetland-Microbial Fuel Cell technology (CW-MFC). The study showed that the removal rates of COD, NH4+-N, and PO43−-P through the multistage tandem system reached 77.32%, 95.97%, and 92.72%, respectively. The study revealed that substrate layers significantly influence microbial community composition, with Clostridium_sensu_stricto_1, unclassified_ Rhizobiales, and Micropruina being primarily enriched in all layers. It can be concluded that microbial metabolism is the primary mechanism of pollution elimination based on the KEGG signaling analysis of PICRUSt2 metabolic pathway 1. The COD removal was dependent on microbial autotrophic carbon fixation reactions; the NH4+-N removal was attributed to the up-regulation of nitrification–denitrification genes; and the PO43−-P removal was dependent on the microbial production of transferase enzymes substituting for phosphoryl groups that converted them to hypophosphite products. This study aims to enhance CW-MFC wastewater treatment for livestock and poultry, improve pollutant removal efficiency, and establish a foundation for future research and practical application.