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

Castro-Castellon, Ana Teresa; Hughes, Jocelyne Mary Rose; Read, Daniel Steven; Azimi, Yaldah; Chipps, Michael James; 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.

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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: Publication - Article
Digital Object Identifier (DOI):
UKCEH and CEH Sections/Science Areas: Soils and Land Use (Science Area 2017-)
ISSN: 0944-1344
Additional Information. Not used in RCUK Gateway to Research.: Publisher link (see Related URLs) provides a read-only full-text copy of the published paper.
Additional Keywords: biofilters, biofiltration, Phalaris arundinacea, allelopathy, cyanobacteria removal, Microcystis removal
NORA Subject Terms: Ecology and Environment
Electronics, Engineering and Technology
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Date made live: 15 Mar 2021 11:31 +0 (UTC)

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