4.7 Article

Magnetophoretic removal of microalgae from fishpond water: Feasibility of high gradient and low gradient magnetic separation

期刊

CHEMICAL ENGINEERING JOURNAL
卷 211, 期 -, 页码 22-30

出版社

ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2012.09.051

关键词

Magnetophoresis; Magnetic nanoparticle; Microalgae removal; Fishpond water; Magnetic separation

资金

  1. Research University (RU) from Universiti Sains Malaysia, Exploratory Research Grants Scheme (ERGS) from Ministry of Higher Education of Malaysia [1001/PJKIMIA/811165, 203/PJKIMIA/6730011]
  2. International Foundation for Science (IFS) [304/PJKIMIA/6050232/1100]
  3. My PhD scholarship from Ministry of Higher Education of Malaysia

向作者/读者索取更多资源

Microalgae blooms in commercial fish production ponds resulting in a deficit in the overall oxygen budget have posed serious challenges to aquaculture industry. In this study, we demonstrate the feasibility of rapid microalgae separation in real-time from fishpond water by magnetophoresis. By relying on the magneto-shape anisotropy of rod-liked iron oxide magnetic nanoparticle (IONPs), overall separation efficiency of microalgae cells up to 90% can be achieved in less than 3 min. The IONPs employed, with a saturation magnetization at 113.8 emu/g, are surface functionalized with cationic polyelectrolyte that promotes the attachment of these particles onto microalgae cells via electrostatic interaction. Kinetic of magnetophoretic separation process was monitored by suspension opacity measurements based upon a custom built light dependent resistor (LDR setup) sensor. Whereas, the overall separation efficiency of microalgae cells is determined spectrophotometrically at 685 nm wavelength. Performance of both high gradient magnetic separation (HGMS) with del B > 1000 T/m and low gradient magnetic separation (LGMS) with del B < 80 T/m were tested with varying particle concentration (50-500 mg/l) and the results obtained were interpreted in term of cooperative magnetophoresis theory. Cost analysis was conducted to verify the feasibility for large scale implementation of LGMS system with the cost involved at $0.13 for every one meter cube of treated fishpond water. (C) 2012 Elsevier B.V. All rights reserved.

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