Enhanced phosphate selectivity from wastewater using copper-loaded chelating resin functionalized with polyethylenimine

Byungryul An, Juhee Nam, Jae Woo Choi, Seok Won Hong, Sang Hyup Lee

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

In water and wastewater, phosphate is considered a critical contaminant due to cause algae blooms and eutrophication. To meet the stringent regulation of phosphate in water, a new commercial chelating resin functionalized with polyethylenimine was tested for phosphate removal by loading Cu2+ and Fe2+/Fe3+ to enhance selectivity for phosphate. Batch and column experiments showed that CR20-Cu exhibited high selectivity for phosphate over other strong anions such as sulfate. The average binary phosphate/nitrate and phosphate/sulfate factors for CR20-Cu were calculated to be 7.3 and 4.8, respectively, which were more than 0.97 and 0.22 for a commercial anion exchanger (AMP16). The optimal pH for the phosphate removal efficiency was determined to be 7. According to the fixed-bed column test, the breakthrough sequence for multiple ions was HPO42->SO42->NO3->Cl-. Saturated CR20-Cu can be regenerated using 4% NaCl at pH 7. More than 95% of the phosphate from CR20-Cu was recovered, and the phosphate uptake capacity for CR20-Cu was not reduced after 7 regeneration cycles.

Original languageEnglish
Pages (from-to)129-134
Number of pages6
JournalJournal of Colloid and Interface Science
Volume409
DOIs
Publication statusPublished - 2013 Nov 1

Keywords

  • Ion exchanger
  • Phosphate
  • Regeneration
  • Selectivity

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry

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