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Phosphate removal using zeolite in treatment wetlands under different oxidation-reduction potentials.

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Title: Phosphate removal using zeolite in treatment wetlands under different oxidation-reduction potentials.
Authors: Andrés, E.1,2, Araya, F.1, Vera, I.1,3, Pozo, G.1,4, Vidal, G.1 glvidal@udec.cl
Source: Ecological Engineering. Jul2018, Vol. 117, p18-27. 10p.
Subjects: Zeolites, Oxidation-reduction reaction, Wetlands, Fluorine compounds, Fluorine
Abstract: The aim of this study was a comparison between PO 4 −3 -P removal from sewage using zeolite as support medium in subsurface flow treatment wetlands (SSF TWs) operated with different oxidation-reduction potentials (ORPs). In addition, the zeolite’s phosphate adsorption characteristics were evaluated. For this, Two mesocosm SSF TWs were installed and operated during 504 d for the PO 4 −3 -P adsorption from sewage: a) mesocosm SSF TW with natural zeolite (MTW-Z1) and b) mesocosm SSF TW with gravel (MTW-G1). Two ORPs was used in MTW-Z1 and MTW-G1: a) ORP-A, ORP >+50 mV, b) ORP-B, ORP <−50 mV. Furthermore, the adsorption characteristics were evaluated in batch assays (zeolite amount and particle size were studied) with different PO 4 −3 -P initial concentrations. Regarding the mesocosm SSF TWs evaluation, the PO 4 −3 -P removed from sewage by MTW-Z1 is between 20% and 50% significantly (p < 0.05) higher than the MTW-G1. At the same time, ORP-A, above +50 mV, significantly improves (p < 0.05), by 10% more, the PO 4 −3 -P removal capacity from sewage. Regarding adsorption characteristics, maximum adsorption capacity determined by Langmuir kinetic was 0.03 mg PO 4 −3 -P g −1 for initial concentrations of 10–15 mg PO 4 −3 -P L −1 . In the case of MTW-Z1 with ORPs A (>+50 mV) and B (<−50 mV), the zeolite maximum adsorption capacity was 0.3 mg PO 4 −3 -P g −1 . Therefore, the potential maximum adsorption capacity of natural zeolite used as a medium in SSF TWs with ORP conditions below −50 mV and above +50 mV can be increased until 10-fold regarding Langmuir adsorption kinetic. [ABSTRACT FROM AUTHOR]
Copyright of Ecological Engineering is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: &lt;searchLink fieldCode=&quot;JN&quot; term=&quot;%22Ecological+Engineering%22&quot;&gt;Ecological Engineering&lt;/searchLink&gt;. Jul2018, Vol. 117, p18-27. 10p.
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  Data: The aim of this study was a comparison between PO 4 −3 -P removal from sewage using zeolite as support medium in subsurface flow treatment wetlands (SSF TWs) operated with different oxidation-reduction potentials (ORPs). In addition, the zeolite’s phosphate adsorption characteristics were evaluated. For this, Two mesocosm SSF TWs were installed and operated during 504 d for the PO 4 −3 -P adsorption from sewage: a) mesocosm SSF TW with natural zeolite (MTW-Z1) and b) mesocosm SSF TW with gravel (MTW-G1). Two ORPs was used in MTW-Z1 and MTW-G1: a) ORP-A, ORP &gt;+50 mV, b) ORP-B, ORP &lt;−50 mV. Furthermore, the adsorption characteristics were evaluated in batch assays (zeolite amount and particle size were studied) with different PO 4 −3 -P initial concentrations. Regarding the mesocosm SSF TWs evaluation, the PO 4 −3 -P removed from sewage by MTW-Z1 is between 20% and 50% significantly (p &lt; 0.05) higher than the MTW-G1. At the same time, ORP-A, above +50 mV, significantly improves (p &lt; 0.05), by 10% more, the PO 4 −3 -P removal capacity from sewage. Regarding adsorption characteristics, maximum adsorption capacity determined by Langmuir kinetic was 0.03 mg PO 4 −3 -P g −1 for initial concentrations of 10–15 mg PO 4 −3 -P L −1 . In the case of MTW-Z1 with ORPs A (&gt;+50 mV) and B (&lt;−50 mV), the zeolite maximum adsorption capacity was 0.3 mg PO 4 −3 -P g −1 . Therefore, the potential maximum adsorption capacity of natural zeolite used as a medium in SSF TWs with ORP conditions below −50 mV and above +50 mV can be increased until 10-fold regarding Langmuir adsorption kinetic. [ABSTRACT FROM AUTHOR]
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  Data: &lt;i&gt;Copyright of Ecological Engineering is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder&#39;s express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.&lt;/i&gt; (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1016/j.ecoleng.2018.03.008
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 10
        StartPage: 18
    Subjects:
      – SubjectFull: Zeolites
        Type: general
      – SubjectFull: Oxidation-reduction reaction
        Type: general
      – SubjectFull: Wetlands
        Type: general
      – SubjectFull: Fluorine compounds
        Type: general
      – SubjectFull: Fluorine
        Type: general
    Titles:
      – TitleFull: Phosphate removal using zeolite in treatment wetlands under different oxidation-reduction potentials.
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            NameFull: Andrés, E.
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            NameFull: Araya, F.
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            NameFull: Vera, I.
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            NameFull: Pozo, G.
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            NameFull: Vidal, G.
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            – D: 01
              M: 07
              Text: Jul2018
              Type: published
              Y: 2018
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              Value: 117
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