title: Evaluation of various harvesting methods for high-density microalgae, Aurantiochytrium sp. KRS101.
abstract: Five technologies, coagulation, electro-flotation (EF), electro-coagulation-flotation (ECF), centrifugation, and membrane filtration, were systematically assessed for their adequacy of harvesting Aurantiochytrium sp. KRS101, a heterotrophic microalgal species that has much higher biomass concentration than photoautotrophic species. Coagulation, EF, and ECF were found to have limited efficiency. Centrifugation was overly powerful to susceptible cells like Aurantiochytrium sp. KRS101, inducing cell rupture and consequently biomass loss of over 13%. Membrane filtration, in particular equipped with an anti-fouling turbulence generator, turned out to be best suited: nearly 100% of harvesting efficiency and low water content in harvested biomass were achieved. With rotation rate increased, high permeate fluxes could be attained even with extremely concentrated biomass: e.g., 219.0 and 135.0 L/m(2)/h at 150.0 and 203.0 g/L, respectively. Dynamic filtration appears to be indeed a suitable means especially to obtain highly concentrated biomass that have no need of dewatering and can be directly processed.
authors.affiliation: Department of Chemical and Biomolecular Engineering, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Republic of Korea.
authors.forename: Kyochan
authors.initials: K
authors.lastname: Kim
authors.affiliation: Department of Chemical and Biomolecular Engineering, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Republic of Korea.
authors.forename: Heewon
authors.initials: H
authors.lastname: Shin
authors.affiliation: Department of Chemical and Biomolecular Engineering, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Republic of Korea.
authors.forename: Myounghoon
authors.initials: M
authors.lastname: Moon
authors.affiliation: Decontamination and Decommissioning Research Division, Korea Atomic Energy Research Institute (KAERI), 989-111 Daedukdaero, Yuseong-gu, Daejeon 305-353, Republic of Korea.
authors.forename: Byung-Gon
authors.initials: BG
authors.lastname: Ryu
authors.affiliation: Department of Civil and Environmental Engineering, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Republic of Korea.
authors.forename: Jong-In
authors.initials: JI
authors.lastname: Han
authors.affiliation: Department of Chemical and Biomolecular Engineering, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Republic of Korea.
authors.forename: Ji-Won
authors.initials: JW
authors.lastname: Yang
authors.affiliation: Department of Chemical and Biomolecular Engineering, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Republic of Korea; Advanced Biomass R&D Center, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Republic of Korea. Electronic address: ychang@kaist.ac.kr.
authors.forename: Yong Keun
authors.initials: YK
authors.lastname: Chang
mesh_terms: D018533:Biomass; D002498:Centrifugation / Q000379:methods*; D005374:Filtration / Q000379:methods*; D058086:Microalgae / Q000302:isolation & purification*; D058009:Stramenopiles / Q000302:isolation & purification*
keywords: Aurantiochytrium sp.; Centrifugation; Coagulation; Electrochemical process; Membrane filtration