Membrane and Water Treatment

  • 제3권4호
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  • Pages.253-266
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  • 2012
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  • 2005-8624(pISSN)
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  • 2092-7037(eISSN)
테크노프레스 (Techno-Press)
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DOI QR코드

DOI QR Code

Hybrid salts precipitation-nanofiltration pretreatment of MSF and RO seawater desalination feed

  • 투고 : 2012.09.11
  • 심사 : 2012.10.24
  • 발행 : 2012.10.25
⟨ 이전 논문 다음 논문 ⟩

초록

In this work, the effect of hybrid salts precipitation-nanofiltration (SP-NF) process on the scale deposits in thermal and membrane desalination processes has been studied. The analysis was carried out to study the scale formation from the Arabian Gulf seawater in MSF and RO reference processes by changing the percentage of pretreatment from 0 to 100%. Four different SP-NF configurations were suggested. A targeted Top Brine Temperature (TBT) of $130^{\circ}C$ may be achieved if 30% portion is pretreated by SP and/or NF processes. As a rule of thumb, each 1% pretreatment portion increases the reference TBT of $115^{\circ}C$ by $0.6^{\circ}C$. For both MSF and RO, parallel pretreatment of certain percentage of the feed by SP and the rest by NF, showed the lowest scale values. The case showed the best values for sulfate scale prevention and the highest values of increasing the monovalent ions relative to the divalent scale forming ions. Sulfate scale is significant in MSF process while carbonate scale is significant in RO. Salt precipitation was suggested because it is less costly than nanofiltration, but nanofiltration was used here because it is efficient in sulfate ions removal.

키워드

참고문헌

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피인용 문헌

  1. Precipitation softening: a pretreatment process for seawater desalination vol.21, pp.4, 2014, https://doi.org/10.1007/s11356-013-2237-1
  2. Nanofiltration pretreatment as CO 2 deaerator of desalination feed: CO 2 release reduction in MSF distillers vol.380, 2016, https://doi.org/10.1016/j.desal.2015.11.022
  3. Improved sea water quality by removal of the total hardness using static step-by-step deposition and extraction technique as an efficient pretreatment method vol.252, 2014, https://doi.org/10.1016/j.cej.2014.04.064
  4. Nanofiltration as a Pretreatment Step in Seawater Desalination: A Review vol.43, pp.9, 2018, https://doi.org/10.1007/s13369-018-3096-3