Journal
DESALINATION AND WATER TREATMENT
Volume 57, Issue 15, Pages 6829-6837Publisher
DESALINATION PUBL
DOI: 10.1080/19443994.2015.1010590
Keywords
Modified clinoptilolite; Potassium; Fixed bed; Seawater desalination; Concentrates
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Funding
- National Key Technology R&D Program in the 11th-five years Plan of China [2006BAB03A10]
- Start-up costs for doctoral research in Hebei University of Technology
- Guiding projects of Scientific and Technological Research and Development of Hebei province of China [07215184]
- Program for Changjiang Scholars and Innovative Research Team in University(PCSIRT) [IRT1059]
- Program for the Top Young Innovative Talents of Hebei Province
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Using modified clinoptilolite, column sorption-elution was carried out for recovering potassium from concentrates, a simulative by-product of brackish and seawater desalination. A breakthrough curve was obtained, and then the total and breakthrough capacity values of the modified clinoptilolite were calculated. The K+ on the zeolite was quantitatively eluted with 25% NaCl solution, and the concentration of K+ in the obtained primary K+-enriched solution was 7.5730 g/L at levels above six times of raw concentrates. Three consecutive sorption-elution cycles were implemented, and the total capacity values remained almost constant, demonstrating the good reusability of modified clinoptilolite. Both Thomas and Yoon-Nelson models could describe the breakthrough curves well, and some column parameters required for the process design were determined. All these could give some contributions to utilization of chemical resources in seawater.
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