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    Horizontal Subsurface Constructed Wetlands for Landfill Leachate Treatment: Substrate Selection and Macrophyte Adaptation Study

    Source: Journal of Environmental Engineering:;2025:;Volume ( 151 ):;issue: 005::page 04025017-1
    Author:
    Gonzalo Gutierrez
    ,
    María Celeste Schierano
    ,
    Carina Griffa
    ,
    Rosana Boglione
    DOI: 10.1061/JOEEDU.EEENG-7967
    Publisher: American Society of Civil Engineers
    Abstract: Municipal solid waste management remains a critical global issue, with landfill leachate as a significant environmental challenge due to its complex and often toxic nature. Traditional treatment methods are not only expensive but often struggle to adequately manage these contaminants. Constructed wetlands (CWs) offer a promising and sustainable alternative, capable of providing effective treatment at a lower cost. This study examines the performance of 12 microcosms designed to simulate horizontal subsurface flow constructed wetlands (HSCWs) for the treatment of landfill leachate. The microcosms, in a greenhouse, utilized a combination of river gravel (RG) and autoclaved aerated concrete (AAC) as substrates. Six microcosms were planted with Typha domingensis, and six were unplanted, serving as controls. Contaminants such as pH, alkalinity, electrical conductivity, total phosphorus (TP), total suspended solids (TSS), ammonium (NH4+), nitrite (NO2−), nitrate (NO3−), total Kjeldahl nitrogen (TKN), biological oxygen demand (BOD5) and chemical oxygen demand (COD) were measured weekly over a two-month period at inlet and outlet samples. A gradual dilution approach was employed to acclimate the macrophytes, which significantly enhanced their survival and treatment performance. The results revealed that microcosms using AAC substrates exhibited improved removal efficiencies for several compounds underscoring the benefits of AAC in constructed wetland systems. These findings suggest that HSCWs, particularly those incorporating AAC, provide a viable and effective solution for landfill leachate management. ACC treatments, T2 and T4, obtained removal efficiencies: 91% and 89% for SST; 69% and 73% for TKN; 78% and 80% for NH4+; −1,383% and −1,540% for NO3−; −156,309% and −251,592% for NO2−; 96% and 99% for NO2−; 77% and 82% for BOD; 43% and 52% for COD, respectively. This research highlights the potential of CWs to serve as an environment friendly alternative to traditional treatment methods and sets the stage for future studies focused on optimizing CW designs and substrate choices to further improve pollutant removal and advance sustainable waste management practices.
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      Horizontal Subsurface Constructed Wetlands for Landfill Leachate Treatment: Substrate Selection and Macrophyte Adaptation Study

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    contributor authorGonzalo Gutierrez
    contributor authorMaría Celeste Schierano
    contributor authorCarina Griffa
    contributor authorRosana Boglione
    date accessioned2025-08-17T23:01:29Z
    date available2025-08-17T23:01:29Z
    date copyright5/1/2025 12:00:00 AM
    date issued2025
    identifier otherJOEEDU.EEENG-7967.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4307793
    description abstractMunicipal solid waste management remains a critical global issue, with landfill leachate as a significant environmental challenge due to its complex and often toxic nature. Traditional treatment methods are not only expensive but often struggle to adequately manage these contaminants. Constructed wetlands (CWs) offer a promising and sustainable alternative, capable of providing effective treatment at a lower cost. This study examines the performance of 12 microcosms designed to simulate horizontal subsurface flow constructed wetlands (HSCWs) for the treatment of landfill leachate. The microcosms, in a greenhouse, utilized a combination of river gravel (RG) and autoclaved aerated concrete (AAC) as substrates. Six microcosms were planted with Typha domingensis, and six were unplanted, serving as controls. Contaminants such as pH, alkalinity, electrical conductivity, total phosphorus (TP), total suspended solids (TSS), ammonium (NH4+), nitrite (NO2−), nitrate (NO3−), total Kjeldahl nitrogen (TKN), biological oxygen demand (BOD5) and chemical oxygen demand (COD) were measured weekly over a two-month period at inlet and outlet samples. A gradual dilution approach was employed to acclimate the macrophytes, which significantly enhanced their survival and treatment performance. The results revealed that microcosms using AAC substrates exhibited improved removal efficiencies for several compounds underscoring the benefits of AAC in constructed wetland systems. These findings suggest that HSCWs, particularly those incorporating AAC, provide a viable and effective solution for landfill leachate management. ACC treatments, T2 and T4, obtained removal efficiencies: 91% and 89% for SST; 69% and 73% for TKN; 78% and 80% for NH4+; −1,383% and −1,540% for NO3−; −156,309% and −251,592% for NO2−; 96% and 99% for NO2−; 77% and 82% for BOD; 43% and 52% for COD, respectively. This research highlights the potential of CWs to serve as an environment friendly alternative to traditional treatment methods and sets the stage for future studies focused on optimizing CW designs and substrate choices to further improve pollutant removal and advance sustainable waste management practices.
    publisherAmerican Society of Civil Engineers
    titleHorizontal Subsurface Constructed Wetlands for Landfill Leachate Treatment: Substrate Selection and Macrophyte Adaptation Study
    typeJournal Article
    journal volume151
    journal issue5
    journal titleJournal of Environmental Engineering
    identifier doi10.1061/JOEEDU.EEENG-7967
    journal fristpage04025017-1
    journal lastpage04025017-10
    page10
    treeJournal of Environmental Engineering:;2025:;Volume ( 151 ):;issue: 005
    contenttypeFulltext
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