Mitigation of algal organic matter released from Chaetoceros affinis and Hymenomonas by in situ generated ferrate
KAUST DepartmentBiological and Environmental Sciences and Engineering (BESE) Division
Water Desalination and Reuse Research Center (WDRC)
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AbstractThis study demonstrates the application of in situ ferrate (Fe(VI)) for the efficient removal of dissolved algal organic matter (AOM) from seawater. Sodium hypochlorite (NaOCl) and ferric (Fe(III)) were used to produce in situ Fe(VI) by wet chemical oxidation. First, the removal efficiencies of model AOM compounds, humic acid (HA), and sodium alginate (SA) were evaluated in the presence of sodium chloride with an initial influent dissolved organic carbon (DOC) concentration of 5.0 mg C L−1 at different pH levels to establish the optimal doses for in situ Fe(VI) generation. The concentration of Fe(VI) was determined by the 2,2-Azino-bis (3-ethylbenzothiazoline-6-sulfonic acid) ultraviolet–visible spectrophotometry method. In the case of HA, 72% DOC removal was recorded when applied with 1.5 mg L−1 of Fe(III) and 1.5 mg L−1 of NaOCl (in situ Fe(VI) concentration of 1.46 mg L−1) while 42% DOC removal was observed for SA. Subsequently, the removal of AOM extracted from two bloom-forming algal species, Chaetoceros affinis (CA) and Hymenomonas (Hym), cultivated in seawater from the Red Sea, were tested with in situ generated Fe(VI) at the established optimum condition. In situ Fe(VI) recorded superior performance in removing AOM extracted from CA and Hym, showing 83% and 92% DOC removal when the influent DOC concentrations were 2.48 and 2.63 mg L−1, respectively. A detailed AOM characterization was conducted using liquid chromatography–organic carbon detection.
CitationDeka BJ, Jeong S, AlizadehTabatabai SA, An AK (2018) Mitigation of algal organic matter released from Chaetoceros affinis and Hymenomonas by in situ generated ferrate. Chemosphere. Available: http://dx.doi.org/10.1016/j.chemosphere.2018.05.052.
SponsorsThis research was financially supported by the Research Grants Council of Hong Kong for Early Career Scheme (Project number: 21201316) and General Research Fund (Project number: 11207717), and Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (2017R1A6A3A04004335).
Except where otherwise noted, this item's license is described as NOTICE: this is the author’s version of a work that was accepted for publication in Chemosphere. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Chemosphere, [, , (2018-05-10)] DOI: 10.1016/j.chemosphere.2018.05.052 . © 2018. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
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