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The role of rhizofiltration and allelopathy on the removal of cyanobacteria in a continuous flow system

Castro-Castellon, Ana Teresa ORCID:, Hughes, Jocelyne Mary Rose, Read, Daniel Steven, Azimi, Yaldah, Chipps, Michael James and Hankins, Nicholas Peter 2021. The role of rhizofiltration and allelopathy on the removal of cyanobacteria in a continuous flow system. Environmental Science and Pollution Research 28 (22) , pp. 27731-27741. 10.1007/s11356-021-12343-9

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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.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Publisher: Springer
ISSN: 0944-1344
Date of Acceptance: 2 January 2021
Last Modified: 10 Nov 2022 10:53

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