title: An integrated process for microalgae harvesting and cell disruption by the use of ferric ions.
abstract: In this study, a simultaneous process of harvesting biomass and extracting crude bio-oil was attempted from wet microalgae biomass using FeCl3 and Fe2(SO4)3 as both coagulant and cell-disrupting agent. A culture solution of Chlorella sp. KR-1 was firstly concentrated to 20 g/L and then proceeded for cell disruption with the addition of H2O2. Optimal dosage were 560 and 1060 mg/L for FeCl3 and Fe2(SO4)3, showing harvesting efficiencies of more than 99%. Optimal extraction conditions were identified via the response surface method (RSM), and the extraction yield was almost the same at 120 °C for both iron salts but FAME compositions after transesterification was found to be quite different. Given iron salts were a reference coagulant in water treatment in general and microalgae harvesting in particular, the present approach of using it for harvesting and oil-extraction in a simultaneous manner can serve as a practical route for the microalgae-derived biodiesel production.
authors: Department of Civil and Environmental Engineering, KAIST, 373-1 Guseong-dong, Yuseong-gu, Daejeon 305-701, Republic of Korea.
authors: Dong-Yeon
authors: DY
authors: Kim
authors: Clean Fuel Department, Korea Institute of Energy Research (KIER), 152 Gajeong-ro, Yuseong-gu, Daejeon 305-343, Republic of Korea.
authors: You-Kwan
authors: YK
authors: Oh
authors: Clean Fuel Department, Korea Institute of Energy Research (KIER), 152 Gajeong-ro, Yuseong-gu, Daejeon 305-343, Republic of Korea.
authors: Ji-Yeon
authors: JY
authors: Park
authors: Clean Fuel Department, Korea Institute of Energy Research (KIER), 152 Gajeong-ro, Yuseong-gu, Daejeon 305-343, Republic of Korea.
authors: Bohwa
authors: B
authors: Kim
authors: Clean Fuel Department, Korea Institute of Energy Research (KIER), 152 Gajeong-ro, Yuseong-gu, Daejeon 305-343, Republic of Korea.
authors: Sun-A
authors: SA
authors: Choi
authors: Department of Civil and Environmental Engineering, KAIST, 373-1 Guseong-dong, Yuseong-gu, Daejeon 305-701, Republic of Korea. Electronic address: jihan@kaist.ac.kr.
authors: Jong-In
authors: JI
authors: Han
mesh_terms: D005290:Ferric Compounds / Q000737:chemistry*; D008055:Lipids / Q000302:isolation & purification; D058086:Microalgae / Q000166:cytology / Q000302:isolation & purification*
chemical_list: D005290:Ferric Compounds; D008055:Lipids
keywords: Cell disruption; Coagulation; Fenton-like reaction; Harvesting; Oil extraction