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Intensified constructed wetlands for the treatment of municipal wastewater: experimental investigation and kinetic modelling

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Abstract

This study reports organics and nutrient removal performances of the intensified constructed wetlands, i.e., tidal flow-based microbial fuel cell (MFC) and tidal flow wetlands that received municipal wastewater. The wetland systems were filled with organic (coco peat, biochar) or waste (Jhama brick, steel slag) materials, planted with Phragmites australis or Chrysopogon zizanioides (Vetiver) species, and operated under three flood periods: 8, 16, 24 h. Input ammonia nitrogen (NH3–N), total nitrogen (TN), phosphorus (P), chemical oxygen demand (COD), and biochemical oxygen demand (BOD) load across the wetland systems ranged between 3–27, 12–78, 0.1–23, 36–1130, and 11–281 g/m2day, respectively; mean removal percentages were 60–83, 74–84, 95–100, 94–98, and 93–97%, respectively, throughout the experimental run. The wetland systems achieved similar organics and P removals; operational and media variation did not influence removal kinetics. All wetland systems achieved the highest TN removal (76–87%) when subjected to 24-h flood period. TN removal performances of waste material–based wetlands were comparable to organic media-based systems. Tidal flow-based MFC wetlands achieved better TN removal than tidal flow wetlands because of supplementary electron production through fuel cell–based organics degradation kinetics. Maximum power production rates across the tidal flow-based MFC wetlands ranged between 53 and 57 mW/m2. Monod kinetics–based continuous stirred tank reactor (CSTR) models predicted NH3–N, TN, and COD removals (in wetland systems) more accurately. Kinetic models confirmed the influence of substrate (i.e., pollutant) and environmental parameters on pollutant removal routes.

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Data availability

All data generated or analyzed during this study are included in this published article [and its supplementary information files].

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Acknowledgements

The authors acknowledge facilities provided by the University of Asia Pacific to undertake this research study.

Funding

The authors received funding provided by the University of Asia Pacific to undertake this research study.

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Authors and Affiliations

  1. Department of Civil Engineering, University of Asia Pacific, Dhaka, 1205, Bangladesh

    Tanveer Saeed, Md Jihad Miah & Tanbir Khan

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  1. Tanveer Saeed
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  2. Md Jihad Miah
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  3. Tanbir Khan
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Contributions

Tanveer Saeed: overall conceptualization, investigation, methodology, project administration, resources, supervision, original manuscript preparation. Md Jihad Miah: resources. Tanbir Khan: data curation, supervision.

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Correspondence to Tanveer Saeed.

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Saeed, T., Miah, M.J. & Khan, T. Intensified constructed wetlands for the treatment of municipal wastewater: experimental investigation and kinetic modelling. Environ Sci Pollut Res 28, 30908–30928 (2021). https://doi.org/10.1007/s11356-021-12700-8

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