A new, energy-efficient approach for boron removal from SWRO plants

Oded Nir, Moshe Herzberg, Ori Lahav*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

A different approach for the operation of seawater reverse osmosis desalination plants, in which the boron concentration in the product water should not exceed 0.3 mgB/L, was recently introduced. The new approach is based on strong acid (either H2SO4 or HCl) dosage to the feed seawater to attain pH~4.3, followed by almost complete CO2 stripping and sub-sequently strong base addition to pH 9.0-9.25. At this high pH range, a high B removal efficiency can be attained even by the new generation of ultra-low energy (high-flux) membranes. This paper addresses the energy saving potential stemming from the elimination or size reduction of the 2nd reverse osmosis (RO) pass and from the use of high-flux elements, both made possible by the new approach. Additionally, total dissolved solids removal from the 1st RO pass permeate can be obtained by operating a smaller, more energy efficient, 2nd RO pass.

Original languageEnglish
Pages (from-to)1651-1656
Number of pages6
JournalDesalination and Water Treatment
Volume51
Issue number7-9
DOIs
StatePublished - 2013
Externally publishedYes

Keywords

  • Boron removal
  • Desalination
  • Post treatment
  • SWRO
  • Stripping towers

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