Phosphate recovery from anaerobic digestion effluent using synthetic magnetite particles
- Authors
- Lee, Won-Hee; Kim, Jong-Oh
- Issue Date
- Feb-2022
- Publisher
- ELSEVIER SCI LTD
- Keywords
- Magnetite; Phosphate recovery; Electrostatic attraction; Ligand exchange
- Citation
- JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING, v.10, no.1, pp.1 - 9
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
- Volume
- 10
- Number
- 1
- Start Page
- 1
- End Page
- 9
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/139628
- DOI
- 10.1016/j.jece.2021.107103
- ISSN
- 2213-2929
- Abstract
- Many researchers studied for phosphate recovery, but practical approach through scale-up still remains a challenge. Therefore, we present a technology for recovery of phosphate in anaerobic digestion effluent by synthesizing magnetite. The zeta potential, Fourier transform infrared spectroscopy (FT-IR), and X-ray Photoelectron Spectroscopy (XPS) analyses were used to derive the phosphate adsorption mechanism of magnetite. Physical adsorption is a weak bond generated by electrostatic attraction on the magnetite surface, and chemical adsorption occurs by ligand exchange in which OH- bonded to the magnetite surface is replaced with H2PO3-. The pseudo-second-order kinetics (R2 > 0.9999) and Langmuir-Freundlich model (R2 > 0.9999) were most suitable for phosphate adsorption. Magnetite follows both Langmuir and Freundlich adsorption isotherms, the phosphate adsorption characteristics by adsorption isotherm is consistent with the zeta potential, XPS and FT-IR analysis. In addition, it was confirmed that magnetite is a stable adsorbent when operating phosphate recovery processes for sewage through adsorption, desorption, and reuse.
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