Effects of feed solution chemistry on low pressure reverse osmosis filtration of cesium and strontium

Shiyuan Ding, Yu Yang, Haiou Huang, Hengchen Liu, Li an Hou

Research output: Contribution to journalArticle

Abstract

The objective of this study was to identify the removal mechanisms of radionuclides by reverse osmosis (RO) membranes under conditions relevant to full-scale water treatment. For this purpose, the effects of feed solution chemistry on the removal of Cs and Sr by a low pressure RO system was investigated by systematically varying membrane surface charge, ionic composition, and organic matter concentrations. The results showed that the effects of solution chemistry on the filtration of Cs and Sr were related to their hydrated ionic radius, resulting in the predominance of the Donnan's effect and electrostatic interactions, respectively. Consequently, the rejection of Cs increased more pronouncedly than Sr with the increases of feed concentration. Due to the Donnan's effect, different anions decreased the rejection of Cs to different extents in accordance to the order of anions' radii as SO42->Cl->NO3->F-. The variations in Sr rejection were influenced by the electrostatic interactions between Sr2+ and the membrane. In addition, humic acid (HA) lowered the rejection of Cs and caused significant membrane flux decline, but did not change the rejection of Sr. Sr also aggravated HA fouling of the membrane.

Original languageEnglish (US)
Pages (from-to)27-34
Number of pages8
JournalJournal of Hazardous Materials
Volume294
DOIs
StatePublished - Aug 1 2015

Keywords

  • Cesium
  • Co-existing ions
  • Radionuclides
  • Reverse osmosis membrane
  • Strontium

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution
  • Health, Toxicology and Mutagenesis

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