Flocculation Effect of Alkaline Electrolyzed Water (AEW) on Harvesting of Marine Microalga Tetraselmis sp
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Title
- Flocculation Effect of Alkaline Electrolyzed Water (AEW) on Harvesting of Marine Microalga Tetraselmis sp
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Author(s)
- Lee, Su-Jin; Choi, Woo-Seok; Park, Gun-Hoo; Kim, Tae-Ho; Oh, Chulhong; Heo, Soo-Jin; Kang, Do-Hyung
- KIOST Author(s)
- Kim, Tae Ho(김태호); Oh, Chul Hong(오철홍); Heo, Soo Jin(허수진); Kang, Do Hyung(강도형)
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Alternative Author(s)
- 최우석; 김태호; 오철홍; 허수진; 강도형
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Publication Year
- 2018-03
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Abstract
- Microalgae hold promise as a renewable energy source for the production of biofuel, as they can convert light energy into chemical energy through photosynthesis. However, cost-efficient harvest of microalgae remains a major challenge to commercial-scale algal biofuel production. We first investigated the potential of electrolytic water as a flocculant for harvesting Tetraselmis sp. Alkaline electrolyzed water (AEW) is produced at the cathode through water electrolysis. It contains mineral ions such as Na+, K+, Ca2+, and Mg2+ that can act as flocculants. The flocculation activity with AEW was evaluated via culture density, AEW concentration, medium pH, settling time, and ionic strength analyses. The flocculation efficiency was 88.7% at 20% AEW (pH 8, 10 min) with a biomass concentration of 2 g/l. The initial biomass concentration and medium pH had significant influences on the flocculation activity of AEW. A viability test of flocculated microalgal cells was conducted using Evans blue stain, and the cells appeared intact. Furthermore, the growth rate of Tetraselmis sp. in recycled flocculation medium was similar to the growth rate in fresh F/2 medium. Our results suggested that AEW flocculation could be a very useful and affordable methodology for fresh biomass harvesting with environmentally friendly easy operation in part of the algal biofuel production process.
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ISSN
- 1017-7825
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URI
- https://sciwatch.kiost.ac.kr/handle/2020.kiost/1009
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DOI
- 10.4014/jmb.1709.09040
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Bibliographic Citation
- JOURNAL OF MICROBIOLOGY AND BIOTECHNOLOGY, v.28, no.3, pp.432 - 438, 2018
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Publisher
- KOREAN SOC MICROBIOLOGY & BIOTECHNOLOGY
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Subject
- BIODIESEL; ECONOMICS; RECOVERY; CHITOSAN; BIOMASS; PH
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Keywords
- Marine microalgae; harvesting; flocculation; alkaline electrolyzed water; Tetraselmis sp
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Type
- Article
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Language
- English
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Document Type
- Article
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