Abstract
Wastewater treatments are often expensive, and the resulting effluent can still harm the environment. Floating treatment wetland is an alternative low-cost eco-technology in which a hydroponic root network remediates polluted waters. This system has been broadly studied as a secondary treatment to remove nutrients and pollutants, but its application to improve raw wastewater quality is still incipient. Moreover, few studies have assessed acute ecotoxicity toward fish after treatment. Thus, this study aimed to evaluate the efficiency of a mesocosm floating treatment wetland to improve the raw wastewater quality from a university campus in South Brazil. Efficiency was assessed based on the improvement of physicochemical parameters (conductivity, pH, turbidity, color), nutrients (nitrogen and phosphorus), and heavy metals (zinc, chromium, copper, lead, and cadmium); Typha domingensis adaptability; and acute fish ecotoxicity reduction after wastewater treatment. Influent was treated with macrophytes tanks and their respective controls. T test was used to compare influent versus effluent samples, and macrophytes tanks versus controls. A Principal Component Analysis identified the main explanatory variables on the system, and a Two-way Cluster Analysis grouped samples before and after treatment. The results show floating mats efficiency in reducing most parameters compared to the influent, except phosphorus and zinc. Control tanks were also effective in improving wastewater quality due to microalgae and duckweed proliferation. In conclusion, floating treatment wetlands with Typha domingensis have the potential to treat raw wastewater. Further nitrogen removal in wastewater might improve acute ecotoxicity toward fish.
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Acknowledgements
The authors would like to thank Luciane Oliveira Crossetti (UFRGS), Gislayne Alves Oliveira (UFRGS), and Ênio Leandro Machado (UNISC) who provided invaluable comments during the development of this article, and also to Luciana Cardoso for her insights on the statistical analysis. We are also grateful to Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (Capes) for the fellowship of L. H. B. (Finance Code 01) and the Institute of Hydraulic Research that provided all assistance with experimental setup for this study. This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.
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LHB, AA, and LHRR contributed to conceptualization; LHB, NDM, AA, NRM, and LHRR helped with methodology; LHB, NDM, JAR, ACAB, and NRM contributed to formal analysis and investigation; LHB helped with writing—original draft preparation; LHB, JAR, AA, and LHRR contributed to writing—review and editing; LHRR helped with funding acquisition; AA, ACAB, and LHRR contributed to resources; and AA and LHRR helped with supervision.
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Bauer, L.H., Arenzon, A., Molle, N.D. et al. Floating treatment wetland for nutrient removal and acute ecotoxicity improvement of untreated urban wastewater. Int. J. Environ. Sci. Technol. 18, 3697–3710 (2021). https://doi.org/10.1007/s13762-020-03124-x
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DOI: https://doi.org/10.1007/s13762-020-03124-x