Removal, Reuse and Recovery of Carbon-Dioxide by Integrating Membrane Contactors in a High-Ph Single-Pass Seawater Reverse Osmosis Process
To increase the recovery ratio and boron rejection of the 1st step in SWRO we previously developed a pretreatment step comprising of acidification and decarbonation of the feed water, followed by pH elevation, which allows efficient boron removal, as well as extraction and reuse of CO2. This paper focuses on the separation of CO2 from acidified seawater and its reuse in the post-treatment stage. A mathematical model was developed and empirically tested for CO2 transfer from the CO2-containing solution to an RO-permeate solution, using a gas-permeable membrane contactor. The single fitted parameter - the mass-transffer coefficient - was independent of the flow rates but dependent on the temperature. The calibrated model was used to successfully predict the CO2 passage from the acidified seawater to the shell side, comprising either RO permeate or a high-pH solution (for producing Na2CO3 solution). The CO2-rich RO permeate (plus a small amount of H2SO4) was then tested for dissolving CaCO3, simulating a common post-treatment step in desalination plants, resulting in pH 7.06-7.43. The Ca2+ concentration ranged between 1.99 and 2.26 mM, i.e., higher than the minimum required by common quality criteria. >90% of the calcite dissolution occurred within a residence time of three minutes
Year of publication: |
[2022]
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Authors: | Nir, Oded ; Sayeg, Shir ; Atsbha, Musie Welldegerima ; Weinman, Amit ; Lahav, Ori ; Nativ, Paz |
Publisher: |
[S.l.] : SSRN |
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