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RISS 인기검색어
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- 저자 : Alizadeh Tabatabai, S. Assiyeh (검색결과 1 건)
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Deka, Bhaskar Jyoti,Jeong, Sanghyun,Alizadeh Tabatabai, S. Assiyeh,An, Alicia Kyoungjin Pergamon Press 2018 Chemosphere Vol.206 No.-
<P><B>Abstract</B></P> <P>This study demonstrates the application of <I>in situ</I> 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 <I>in situ</I> Fe(VI) by wet chemical oxidation. First, the removal efficiencies of two 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<SUP>−1</SUP> at different pH levels to establish the optimal doses for <I>in situ</I> 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<SUP>−1</SUP> of Fe(III) and 1.5 mg L<SUP>−1</SUP> of NaOCl (<I>in situ</I> Fe(VI) concentration of 1.46 mg L<SUP>−1</SUP>) while 42% DOC removal was observed for SA. Subsequently, the removal of AOM extracted from two bloom-forming algal species, <I>Chaetoceros affinis</I> (<I>CA</I>) and <I>Hymenomonas</I> (<I>Hym</I>), cultivated in seawater from the Red Sea, were tested with <I>in situ</I> generated Fe(VI) at the established optimum condition. <I>In situ</I> Fe(VI) recorded superior performance in removing AOM extracted from <I>CA</I> and <I>Hym</I>, showing 83% and 92% DOC removal when the influent DOC concentrations were 2.48 and 2.63 mg L<SUP>−1</SUP>, respectively. A detailed AOM characterization was conducted using liquid chromatography–organic carbon detection.</P> <P><B>Highlights</B></P> <P> <UL> <LI> In situ ferrate was generated by combined dosages of sodium hypochlorite and ferric. </LI> <LI> Ferrate concentration was determined using indirect ABTS UV–Vis method. </LI> <LI> Algal Organic Matter removal by <I>in situ</I> ferrate was superior to that by ferric. </LI> <LI> <I>In situ</I> generated ferrate showed high affinity for oxidizing humic substances. </LI> <LI> <I>In situ</I> generated ferrate removed biopolymers by forming aggregates. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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