title: A simple and rapid harvesting method for microalgae by in situ magnetic separation.
abstract: A simple and rapid harvesting method by in situ magnetic separation with naked Fe(3)O(4) nanoparticles has been developed for the microalgal recovery of Botryococcus braunii and Chlorella ellipsoidea. After adding the magnetic particles to the microalgal culture broth, the microalgal cells were adsorbed and then separated by an external magnetic field. The maximal recovery efficiency reached more than 98% for both microalgae at a stirring speed of 120 r/min within 1 min, and the maximal adsorption capacity of these Fe(3)O(4) nanoparticles reached 55.9 mg-dry biomass/mg-particles for B. braunii and 5.83 mg-dry biomass/mg-particles for C. ellipsoidea. Appropriate pH value and high nanoparticle dose were favorable to the microalgae recovery, and the adsorption mechanism between the naked Fe(3)O(4) nanoparticles and the microalgal cells was mainly due to the electrostatic attraction. The developed in situ magnetic separation technology provides a great potential for saving time and energy associated with improving microalgal harvesting.
authors: National Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, PR China.
authors: Ling
authors: L
authors: Xu
authors: Chen
authors: C
authors: Guo
authors: Feng
authors: F
authors: Wang
authors: Sen
authors: S
authors: Zheng
authors: Chun-Zhao
authors: CZ
authors: Liu
mesh_terms: D000327:Adsorption; D005290:Ferric Compounds / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D008280:Magnetics / Q000379:methods*; D058086:Microalgae / Q000254:growth & development* / Q000302:isolation & purification*; D008956:Models, Chemical; D053758:Nanoparticles / Q000737:chemistry; D059027:Recycling; D013696:Temperature
chemical_list: D005290:Ferric Compounds; C000499:ferric oxide