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Treating Ion-Exchange Waste Brines w...

Homan, Nathaniel Pierce.

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Treating Ion-Exchange Waste Brines with Ferrous Chloride.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Treating Ion-Exchange Waste Brines with Ferrous Chloride./
Author:	Homan, Nathaniel Pierce.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2017,
Description:	43 p.
Notes:	Source: Masters Abstracts International, Volume: 57-02.
Contained By:	Masters Abstracts International57-02(E).
Subject:	Environmental engineering. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10287147
ISBN:	9780355460780

Treating Ion-Exchange Waste Brines with Ferrous Chloride.
Homan, Nathaniel Pierce.

Treating Ion-Exchange Waste Brines with Ferrous Chloride. - Ann Arbor : ProQuest Dissertations & Theses, 2017 - 43 p.

Source: Masters Abstracts International, Volume: 57-02.

Thesis (M.Engr.)--University of California, Davis, 2017.

Ferrous chloride (FeCl2) added to chromium-laden brines produced by strong base anion exchange (SBA-IX) systems reduces hexavalent chromium [Cr(VI)] to trivalent chromium [Cr(III)] and precipitates the Cr(III) in a mixed chromium-iron hydroxide solid solution. A series of jar tests was conducted in which FeCl2 was added to synthetic SBA-IX brines. The variables investigated were initial Cr(VI) concentration, initial pH, and Fe(II):Cr(VI) stoichiometric dose ratio. This reduction-coagulation-flocculation (RCF) process was also tested on field brines with various compositions. The RCF process achieved greater than 77% chromium removal efficiency at all tested conditions, except in brines with a bicarbonate matrix. Significant vanadium and arsenic removal (>78% and >49% removal, respectively) was observed in field brines with a chloride or sulfate matrix. Diffuse double layer modeling suggests that adsorption to the precipitated solids was the predominant removal mechanism of vanadium and arsenic.

ISBN: 9780355460780Subjects--Topical Terms:

548583
Environmental engineering.

Treating Ion-Exchange Waste Brines with Ferrous Chloride.
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300 $a 43 p.
500 $a Source: Masters Abstracts International, Volume: 57-02.
500 $a Includes supplementary digital materials.
500 $a Adviser: Thomas M. Young.
502 $a Thesis (M.Engr.)--University of California, Davis, 2017.
520 $a Ferrous chloride (FeCl2) added to chromium-laden brines produced by strong base anion exchange (SBA-IX) systems reduces hexavalent chromium [Cr(VI)] to trivalent chromium [Cr(III)] and precipitates the Cr(III) in a mixed chromium-iron hydroxide solid solution. A series of jar tests was conducted in which FeCl2 was added to synthetic SBA-IX brines. The variables investigated were initial Cr(VI) concentration, initial pH, and Fe(II):Cr(VI) stoichiometric dose ratio. This reduction-coagulation-flocculation (RCF) process was also tested on field brines with various compositions. The RCF process achieved greater than 77% chromium removal efficiency at all tested conditions, except in brines with a bicarbonate matrix. Significant vanadium and arsenic removal (>78% and >49% removal, respectively) was observed in field brines with a chloride or sulfate matrix. Diffuse double layer modeling suggests that adsorption to the precipitated solids was the predominant removal mechanism of vanadium and arsenic.
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