Flocculation and mechanism of self-flocculating lipid producer microalga Scenedesmus quadricauda for biomass harvesting |
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| Affiliation: | 1. Ernst-Moritz-Arndt-University of Greifswald, Institute of Pharmacy, Department Pharmaceutical Biology, Friedrich-Ludwig-Jahn-Str. 17, 17491 Greifswald, Germany;2. Technische Universität München, Chair of Chemistry of Biogenic Resources, Straubing Center of Science, Schulgasse 16, Straubing, Germany;1. Department of Biology, Middle East Technical University, 06800 Ankara, Turkey;2. Department of Biotechnology, Middle East Technical University, 06800 Ankara, Turkey;3. Konya Food and Agriculture University, Faculty of Agriculture and Natural Sciences, 42080 Meram, Konya, Turkey;1. Centre for Biofuel and Biochemical Research (CBBR), Universiti Teknologi PETRONAS, Bandar Seri Iskandar, 31750 Tronoh, Perak, Malaysia;2. Department of Chemical and Environmental Engineering, Faculty of Engineering, University Putra Malaysia, Sri Serdang 43400, Selangor, Malaysia;3. Department of Soil Sciences and Water Resources, Collage of Agriculture, Baghdad University, Jadriyah, Baghdad, Iraq;4. Department of Civil and Water Resources Engineering, University of Maiduguri, P.M.B 1069, Maiduguri, Borno State, Nigeria;1. College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China;2. College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China;1. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, PR China;2. College of Earth and Environmental Science, Lanzhou University, Lanzhou 730000, PR China;3. Sichuan Environmental Protection Key Laboratory of Groundwater Antipollution and Resource Security, Chengdu 610059, PR China;1. Centre for Biofuel and Biochemical Research (CBBR), Universiti Teknologi PETRONAS, 31750 Tronoh, Perak, Malaysia;2. Biomass Processing Lab, Universiti Teknologi PETRONAS, 31750 Tronoh, Perak, Malaysia |
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| Abstract: | In this study, the extracellular polymeric substance of Scenedesmus quadricauda called EPS-S.q and its bioflocculatoin mechanism were investigated. Results showed EPS-S.q was successfully used as bioflocculating agent for S. quadricauda biomass harvesting and flocculation efficiency of up to 86.7% to S. quadricauda cells could be achieved in presence of Zn2+. EPS-S.q was the flocculating agent for self-flocculating microalga S. quadricauda and bioflocculation mechanism was polymer bridging. The sugar and protein mass fraction of dry EPS-S.q was sugar 56.7% and protein 41%. The infrared spectrum further indicated the presence of hydroxyl, carboxyl and amino groups. Moreover, pH decrease induced the flocculation of S. quadricauda and 78.4% of flocculation efficiency was the highest at pH 3. In addition, chemical flocculant FeCl3 was efficiently used for S. quadricauda harvesting and up to 96.8% of flocculation efficiency could be achieved for S. quadricauda culture with biomass concentration 0.21–0.39 g L−1 at pH 7. |
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| Keywords: | Microalgae harvesting Bioflocculant Flocculation pH decrease Ferric chloride flocculant |
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