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<p>The trend of combining multiple types of constructed wetlands into a hybrid constructed wetland (HCW) system to enhance treatment capacity is becoming more popular, but the efficiency of nitrogen removal in poultry slaughter wastewater is still limited due to insufficient oxygen availability for nitrifying bacteria. In an on-site experimental study lasting over 12 months, three modified HCW systems (designated HCWs A, B, and C) were constructed, each comprising a three-stage wetland unit (30&#xa0;m²) planted with <i>Phragmites australis</i> and equipped with a multiple tray aerator containing plastic media. HCWs A, B, and C were operated at hydraulic loading rates (HLRs) of 0.02, 0.05, and 0.08&#xa0;m³/m².day, respectively. For comparison, a conventional three-stage HCW system (HCW D) was also constructed and operated at an HLR of 0.02&#xa0;m³/m².day. The incorporation of the multiple tray aerator into the HCW system significantly enhanced the removal efficiencies of biological oxygen demand, chemical oxygen demand, total suspended solids, ammonia nitrogen, total nitrogen, total phosphorus, and total coliforms. In the modified HCW systems, removal performance was strongly influenced by the applied HLR, with the highest efficiencies of 93.4%, 91.5%, 91.3%, 95.1%, 87.1%, 74.5%, and 99.9%, respectively, achieved in HCW A at the lowest HLR of 0.02&#xa0;m³/m².day. The effluent from HCW A met all Vietnamese discharge standards without the need for disinfection. The sequential configuration of the modified HCW system significantly improved the removal of organic matter, suspended solids, nutrients, and pathogens, particularly nitrogen.</p>

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Modified Hybrid Constructed Wetland System for Poultry Slaughter Wastewater Treatment

  • 期刊论文

  • 发表日期：

    2026年2月9日

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  • Viet Hung Dang,
  • Thi Thanh Duong,
  • Quoc Huy Lam,
  • My Linh Nguyen,
  • Thai Anh Nguyen,
  • Thi Huynh Tram Le

摘要

The trend of combining multiple types of constructed wetlands into a hybrid constructed wetland (HCW) system to enhance treatment capacity is becoming more popular, but the efficiency of nitrogen removal in poultry slaughter wastewater is still limited due to insufficient oxygen availability for nitrifying bacteria. In an on-site experimental study lasting over 12 months, three modified HCW systems (designated HCWs A, B, and C) were constructed, each comprising a three-stage wetland unit (30 m²) planted with Phragmites australis and equipped with a multiple tray aerator containing plastic media. HCWs A, B, and C were operated at hydraulic loading rates (HLRs) of 0.02, 0.05, and 0.08 m³/m².day, respectively. For comparison, a conventional three-stage HCW system (HCW D) was also constructed and operated at an HLR of 0.02 m³/m².day. The incorporation of the multiple tray aerator into the HCW system significantly enhanced the removal efficiencies of biological oxygen demand, chemical oxygen demand, total suspended solids, ammonia nitrogen, total nitrogen, total phosphorus, and total coliforms. In the modified HCW systems, removal performance was strongly influenced by the applied HLR, with the highest efficiencies of 93.4%, 91.5%, 91.3%, 95.1%, 87.1%, 74.5%, and 99.9%, respectively, achieved in HCW A at the lowest HLR of 0.02 m³/m².day. The effluent from HCW A met all Vietnamese discharge standards without the need for disinfection. The sequential configuration of the modified HCW system significantly improved the removal of organic matter, suspended solids, nutrients, and pathogens, particularly nitrogen.