Adsorption of phosphate from aqueous solution using electrochemically modified biochar calcium-alginate beads: Batch and fixed-bed column performance

Kyung Won Jung, Tae Un Jeong, Jae Woo Choi, Kyu Hong Ahn, Sang-Hyup Lee

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

Batch and continuous fixed-bed column studies were investigated using electrochemically modified biochar calcium-alginate beads (EMB-CABs) as an adsorbent for the removal of phosphate from aqueous solutions. Batch experiments revealed that the phosphate adsorption behavior of EMB-CABs and its structural characteristics were highly dependent on pH condition. Also, kinetics and equilibrium isotherms studies demonstrated that the experimental data correlated well with the pseudo-second-order and Sips isotherm models, respectively. The effects of different operating parameters such as bed height, initial phosphate concentration, and flow rate were investigated in a continuous fixed-bed column, and the experimental data were fitted to three different breakthrough models, the Adams-Bohart, Thomas, and Yoon-Nelson models. The results suggested that the Yoon-Nelson model showed better agreement with the breakthrough curves than other models. Lastly, the design parameters for a large-scale column were calculated via the scale-up approach using the breakthrough parameters obtained from lab-scale column tests.

Original languageEnglish
Pages (from-to)23-32
Number of pages10
JournalBioresource Technology
Volume244
DOIs
Publication statusPublished - 2017 Nov 1

Keywords

  • Breakthrough curve
  • Calcium-alginate beads
  • Fixed-bed column
  • Phosphate
  • Yoon-Nelson model

ASJC Scopus subject areas

  • Bioengineering
  • Environmental Engineering
  • Waste Management and Disposal

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