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SWRO brine reuse by diaphragm-type chlor-alkali electrolysis to produce alkali-activated slag

Title
SWRO brine reuse by diaphragm-type chlor-alkali electrolysis to produce alkali-activated slag
Author
박주양
Keywords
Seawater desalination; SWRO discharge brine; Chlor-alkali; Alkaline effluent; Alkali-activated slag
Issue Date
2017-07
Publisher
ELSEVIER SCIENCE BV
Citation
DESALINATION, v. 413, page. 10-18
Abstract
Seawater desalination generates concentrated brine, which may pose a threat to marine ecosystems upon discharge into the ocean. This study was conducted to evaluate possibility possible novel approach for electrochemical post-treatment of seawater reverse osmosis (SWRO) discharge brine and reuse without further additional brine enrichment processes. A synthetic brine and real brine from a SWRO plant were electrolyzed under controlled conditions to obtain a mild alkaline solution using a diaphragm-type chlor-alkali cell. Under a 100 mA/cm(2) current density and 37.5-45 min of hydraulic retention time (HRT), a maximum NaOH concentration of 33 wt% was obtained from real SWRO brine (initially 1.7-1.9 times the salinity of seawater) with 63% chloride removal via electrolysis. In electrolyzed brine reuse, a solid alkali-activated slag (AAS) product resulted from mixing 3.5 and 2.0 wt% NaOH alkali effluents (as an alkaline activator of slag) produced via electrolysis of synthetic brine and ground granulated blast furnace slag (GGBFS) from steelworks. For the specimens cured for 3-28 days, relatively high compressive strengths of 12.9-153 MPa and 9.8-11 MPa, respectively, were obtained. (C) 2017 Elsevier B.V. All rights reserved.
URI
https://www.sciencedirect.com/science/article/pii/S0011916416304295?via%3Dihubhttp://repository.hanyang.ac.kr/handle/20.500.11754/114937
ISSN
0011-9164; 1873-4464
DOI
10.1016/j.desal.2017.02.01910.1016/j.desal.2017.02.019
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > CIVIL AND ENVIRONMENTAL ENGINEERING(건설환경공학과) > Articles
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