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Does Photo-Fenton Works for Microalgae Control? A case of study with Desmodesmus subspicatus


Increased concentrations of nutrients in water bodies caused by effluents discharge, fertilizers and other inputs can lead to artificial eutrophication, increasing the primary productivity, bringing well-known and serious consequences to the environment (such as excessive macrophyte and microalgae growth). Most strategies for phytoplankton control in aquatic ecosystems result in metal accumulation or toxic by-products formation after chlorination. Concerning this matter, Photo-Fenton Process (usually applied in wastewater treatment and degradation of a variety of contaminants) have been studied for water and effluent disinfection. However, its application in microalgae inactivation was not reported until know. Therefore, this work aimed to evaluate the process effectiveness in inactivating microalgae, using Desmodesmus subspicatus as model. Photo-Fenton experiments were carried out in lab scale, at 105 cell mL-1 with 20 mg L-1 of H2O2 and 5 mg L-1 of Fe2+ (complexed with oxalic acid). Cell concentration and Growth Inhibition Test (GIT) were used to evaluate the process efficiency and Scanning Electron Microscopy (SEM) to analyze any alterations in cell morphology. After performing photo-Fenton reaction, the individual contribution of the reactants and radiation were investigated. Cell concentration were not significantly reduced during photo-Fenton, but SEM images indicated possible morphology alterations and GIT showed loss of cell viability after 30 minutes of exposure. Effects on cell growth were also observed when exposed only to hydrogen peroxide.

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Publication details

The article was received on 05 Dec 2017, accepted on 07 Feb 2018 and first published on 08 Feb 2018

Article type: Technical Note
DOI: 10.1039/C7PP00443E
Citation: Photochem. Photobiol. Sci., 2018, Accepted Manuscript
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    Does Photo-Fenton Works for Microalgae Control? A case of study with Desmodesmus subspicatus

    M. D. A. Torres, M. V. de Liz, L. R. R. Martins and A. Freitas, Photochem. Photobiol. Sci., 2018, Accepted Manuscript , DOI: 10.1039/C7PP00443E

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