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Towards water, sodium chloride and natural organic matter recovery from ion exchange spent brine

Maryam Haddad, Laurent Bazinet and Benoit Barbeau

Article (2021)

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Abstract

Despite the tremendous success of the application of anion exchange resins (IX) in natural organic matter (NOM) removal over conventional removal methods, the considerable amount of brine spent during its regeneration cycle makes its sustainability questionable. This polluting saline stream can be challenging to manage and costly to discharge. Alternatively, and with the recent shift in perception of resource recovery, the produced spent brine can no longer be seen as a polluting waste but as an unconventional source of water, minerals and nutrients. In this research, for the first time, we evaluated the effectiveness of an integrated monovalent selective electrodialysis (MSED) and direct contact membrane distillation (DCMD) system in IX spent brine desalination and resource recovery. Of particular interest were the effects of operating time on the characteristics of the monovalent permselective ion exchange membranes, the impact of the DCMD stack configuration on minimizing heat loss to the ambient environment and the efficacy of the recovered NaCl in the regenerating cycle of the exhausted IXs. Our findings demonstrated that although the recovered NaCl from the stand-alone MSED can restore nearly 60% ion exchange capacity of the exhausted IXs, coupling MSED with DCMD led to minimizing the consumption of fresh NaCl (in the IX regeneration cycle) significantly, the potential application of NOM in agriculture and diminishing the risk of the IX spent brine disposal. In addition, the initial characteristics of the ion permselective membranes were maintained after 24 h of MSED and the transmembrane flux was increased when the feed/hot compartment (in the DCMD stack) was encapsulated on two outer ends with coolant/permeate compartments as a result of less heat loss to the ambient environment.

Uncontrolled Keywords

spent brine; ion exchange; resource recovery; monovalent selective electrodialysis (MSED); DCMD; stack configuration

Subjects: 1000 Civil engineering > 1006 Hydrologic engineering
1000 Civil engineering > 1007 Water resources and supply
1500 Environmental engineering > 1500 Environmental engineering
1500 Environmental engineering > 1501 Water quality, pollution
Department: Department of Civil, Geological and Mining Engineering
Research Center: Other
Funders: CRSNG / NSERC, CSULB small faculty grant
PolyPublie URL: https://publications.polymtl.ca/9408/
Journal Title: Membranes (vol. 11, no. 4)
Publisher: MDPI
DOI: 10.3390/membranes11040262
Official URL: https://doi.org/10.3390/membranes11040262
Date Deposited: 16 Aug 2023 12:35
Last Modified: 09 Apr 2024 16:56
Cite in APA 7: Haddad, M., Bazinet, L., & Barbeau, B. (2021). Towards water, sodium chloride and natural organic matter recovery from ion exchange spent brine. Membranes, 11(4), 13 pages. https://doi.org/10.3390/membranes11040262

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