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This study presents an innovative integrated system combining constructed wetland-microbial fuel cells (CW-MFC) with downstream microalgae cultivation for comprehensive livestock wastewater treatment and resource recovery. The pilot-scale system (treating 50 m3/day) achieved remarkable pollutant removal efficiencies: COD (92.4 ± 2.1%), TN (88.7 ± 3.2%), TP (94.3 ± 1.8%), and antibiotic resistance genes (ARGs) reduction of 3.2-log units. The CW-MFC generated 186 ± 12 mW/m2 power density while the microalgae unit produced 1.84 ± 0.15 g/L biomass containing 42.3% protein and 28.6% lipids. Economic analysis revealed a net profit of $12.4/m3 treated water through bioelectricity generation ($0.82/m3), microalgae biomass sales ($8.65/m3), and recovered struvite fertilizer ($2.93/m3). Life cycle assessment demonstrated 78% reduction in greenhouse gas emissions compared to conventional treatment. This integrated approach addresses critical challenges in livestock wastewater management while advancing circular economy principles through simultaneous treatment, energy generation, and resource recovery.

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Integrated Constructed Wetland-Microbial Fuel Cell Coupled with Microalgae Cultivation for Sustainable Livestock Wastewater Treatment a Circular Economy Approach

  • 会议论文

  • 发表日期：

    2026年

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  • Jiemei Wang,
  • Mingyang Jiang,
  • Jikuo Zhao,
  • Dan Ling

摘要

This study presents an innovative integrated system combining constructed wetland-microbial fuel cells (CW-MFC) with downstream microalgae cultivation for comprehensive livestock wastewater treatment and resource recovery. The pilot-scale system (treating 50 m3/day) achieved remarkable pollutant removal efficiencies: COD (92.4 ± 2.1%), TN (88.7 ± 3.2%), TP (94.3 ± 1.8%), and antibiotic resistance genes (ARGs) reduction of 3.2-log units. The CW-MFC generated 186 ± 12 mW/m2 power density while the microalgae unit produced 1.84 ± 0.15 g/L biomass containing 42.3% protein and 28.6% lipids. Economic analysis revealed a net profit of $12.4/m3 treated water through bioelectricity generation ($0.82/m3), microalgae biomass sales ($8.65/m3), and recovered struvite fertilizer ($2.93/m3). Life cycle assessment demonstrated 78% reduction in greenhouse gas emissions compared to conventional treatment. This integrated approach addresses critical challenges in livestock wastewater management while advancing circular economy principles through simultaneous treatment, energy generation, and resource recovery.