Abstract
A continuous flow filtration system was designed to identify and quantify the removal mechanisms of Cyanobacteria (Microcystis aeruginosa) by hydroponic biofilters of Phalaris arundinacea compared to synthetic filters. The filtration units were continuously fed under plug-flow conditions with Microcystis grown in photobioreactors. Microcystis cells decreased at the two flow rates studied (1.2 ± 0.2 and 54 ± 3 cm3 minˉ1) and results suggested physical and chemical/biological removal mechanisms were involved. Physical interception and deposition was the main removal mechanism with packing density of the media driving the extent of cell removal at high flow, whilst physical and chemical/biological mechanisms were involved at low flow. At low flow, the biofilters decreased Microcystis cell numbers by 70% compared to the controls. The decrease in cell numbers in the biofilters was accompanied by a chlorotic process (loss of green colour), suggesting oxidative processes by the release of allelochemicals from the biofilters.
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The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
From Thames Water, the authors thank specially Dr. Paul Rutter for his support and Nick Sutherland for assisting with the experimental set-up logistics. Thanks to Helen Shapland and Kevin O’Reilly, Trace Organics laboratory, Scientific Centre, Wessex Water Ltd., for allowing us the use of their HPLC. The authors are especially grateful to Toni Hall, Alexander T. Jennings and Gary Hunt for their assistance with developing the HPLC allelochemicals method.
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This project was fully sponsored by Thames Water Utilities Ltd. The design of the study presented in this manuscript, collection, analysis, and interpretation of data, and writing the manuscript are the views of the authors. Lady Margaret Hall, University of Oxford sponsored attendance to conferences where aspects of this work were presented.
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Conceptualization, experimental design, methodology, material preparation, data collection, formal analysis, investigation, writing original draft, and reviewing and editing were performed by Ana T. Castro Castellon. Resources, experimental design, data analysis, and validation were performed by Daniel S. Read. Conceptualization and writing original draft: Yaldah Azimi and Jocelyne M.R. Hughes. Supervision, project administration and resources: Jocelyne M.R. Hughes, Nicholas P. Hankins, and Michael J. Chipps. Funding acquisition by Michael J. Chipps. All authors reviewed, commented, and edited on previous versions of the manuscript.
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Castro-Castellon, A.T., Hughes, J.M.R., Read, D.S. et al. The role of rhizofiltration and allelopathy on the removal of cyanobacteria in a continuous flow system. Environ Sci Pollut Res 28, 27731–27741 (2021). https://doi.org/10.1007/s11356-021-12343-9
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DOI: https://doi.org/10.1007/s11356-021-12343-9