Adsorption of phosphate from aqueous solution using electrochemically modified biochar calcium-alginate beads: Batch and fixed-bed column performance
- Authors
- Jung, Kyung-Won; Jeong, Tae-Un; Choi, Jae-Woo; Ahn, Kyu-Hong; Lee, Sang-Hyup
- Issue Date
- 11월-2017
- Publisher
- ELSEVIER SCI LTD
- Keywords
- Phosphate; Calcium-alginate beads; Fixed-bed column; Breakthrough curve; Yoon-Nelson model
- Citation
- BIORESOURCE TECHNOLOGY, v.244, pp.23 - 32
- Indexed
- SCIE
SCOPUS
- Journal Title
- BIORESOURCE TECHNOLOGY
- Volume
- 244
- Start Page
- 23
- End Page
- 32
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/81831
- DOI
- 10.1016/j.biortech.2017.07.133
- ISSN
- 0960-8524
- 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.
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