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Process economic evaluation of resource valorization of seawater concentrate by membrane technology
Zhang, W.; Miao, M.; Pan, J.; Sotto, A.; Shen, J.; Gao, C.; Van der Bruggen, B. (2017). Process economic evaluation of resource valorization of seawater concentrate by membrane technology. ACS Sustainable Chemistry & Engineering 5(7): 5820-5830. https://dx.doi.org/10.1021/acssuschemeng.7b00555
In: ACS Sustainable Chemistry & Engineering. American Chemical Society: Washington DC. ISSN 2168-0485; e-ISSN 2168-0485, more
Peer reviewed article  

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Keyword
    Marine/Coastal
Author keywords
    Electrodialysis; Monovalent-selective ion-exchange membrane; Seawaterconcentrate; Bipolar membrane electrodialysis; Coarse salt; Acid-baseproduction; Purity; Valorization; Estimation

Authors  Top 
  • Zhang, W.
  • Miao, M.
  • Pan, J.
  • Sotto, A.
  • Shen, J.
  • Gao, C.
  • Van der Bruggen, B., more

Abstract
    In this study, a process design consisting of chemical precipitation, electrodialysis with monovalent-selective membranes, and bipolar membrane electrodialysis (BMED) is proposed to valorize seawater concentrate discharged from an RO (reverse osmosis) plant for the production of acid/base and coarse salt with high purity. After pre-precipitation and electrodialysis with monovalent-selective membranes, a high purity of coarse salt (∼92%) was obtained. Furthermore, the effect of current density and feed concentration of the BMED process on the production of acid/base with high purity was investigated. It is acceptable to attain acid/base with a purity of ∼95%/∼85% when operating at a current density of 10 mA/cm2 and a feed conductivity of 100 mS/cm by applying the screened BMED stack. Finally, the total process cost for the acid/base production was estimated at $0.50/kg at the current density of 10 mA/cm2, which is appropriate and competitive for industrial application.

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