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Desalination, 2nd Edition
book

Desalination, 2nd Edition

by Jane Kucera
April 2019
Intermediate to advanced content levelIntermediate to advanced
768 pages
21h 31m
English
Wiley-Scrivener
Content preview from Desalination, 2nd Edition

Chapter 12Electrosorption of Heavy Metals with Capacitive Deionization: Water Reuse, Desalination and Resources Recovery

Pei Xu1, Brian Elson2 and Jörg E Drewes3

1New Mexico State University, Las Cruces, New Mexico, USA

2The Water Company, Pueblo, Colorado, USA

3Urban Water Systems Engineering, Technische Universität München, Germany

Abstract

Capacitive deionization (CDI) is an emerging electrosorption process that simultaneously produces deionized water for reuse and recovers valuable heavy metals from waste streams. Bench-scale experiments were conducted to investigate the electrosorption selectivity of metals and cyanide by activated carbon electrodes. Over the course of 158 treatment cycles, CDI remained high efficiency in removing heavy metals and meeting drinking water standards. Within 25 to 30 minutes retention time, the percent removal of conductivity achieved 97.9–96.4% and the effluent conductivity increased slightly from 13 μS/cm in the beginning of experiments to 22 μS/cm at the end of the testing period. Activated carbon electrodes adsorbed trivalent and tetravalent ions preferentially compared to divalent ions. Uranium-238 (IV), iron (III) and chromium (III) were reduced by 98.9±0.6%, 99.9±0.06% 99.6±0.3% while nickel (II), copper (II), lead (II) and zinc were retained 89.0±7.3%, 94.8±2.7%, 94.0±3.3%, 85.2±9.0%, respectively. Nearly all the metal concentrations in the deionized water met the USEPA drinking water standards, except lead (II). CDI reduced the lead ...

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Publisher Resources

ISBN: 9781119407744Purchase book