TY - JOUR
T1 - Effects of feed solution chemistry on low pressure reverse osmosis filtration of cesium and strontium
AU - Ding, Shiyuan
AU - Yang, Yu
AU - Huang, Haiou
AU - Liu, Hengchen
AU - Hou, Li an
N1 - Funding Information:
This study was financially supported by the National Natural Science Foundation of China (grant no. 51238006 ), the research fund for the Doctoral Program of Higher Education of China ( 20130003120027 ) and the Fundamental Research Funds for the Central Universities .
Publisher Copyright:
© 2015 Elsevier B.V.
PY - 2015/8/1
Y1 - 2015/8/1
N2 - 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.
AB - 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.
KW - Cesium
KW - Co-existing ions
KW - Radionuclides
KW - Reverse osmosis membrane
KW - Strontium
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U2 - 10.1016/j.jhazmat.2015.03.056
DO - 10.1016/j.jhazmat.2015.03.056
M3 - Article
C2 - 25841084
AN - SCOPUS:84939649076
SN - 0304-3894
VL - 294
SP - 27
EP - 34
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
ER -