Harvesting of Scenedesmus obliquus cultivated in seawater using electro-flotation

Heewon Shin; Kyochan Kim; Joo-Young Jung; Sungchul Charles Bai; Yong Keun Chang; Jong-In Han

Korean Journal of Chemical Engineering, Vol.34, No.1, 62-65, January, 2017

DOI10.1007/s11814-016-0251-y Export Citation

Harvesting of Scenedesmus obliquus cultivated in seawater using electro-flotation

Heewon Shin¹, Kyochan Kim¹, Joo-Young Jung^{2, 3}, Sungchul Charles Bai^{2, 4}, Yong Keun Chang^{1, 3}, and Jong-In Han^{5, †}

¹Department of Chemical and Biomolecular Engineering, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Korea
²Department of Marine Bio-materials and Aquaculture/Feeds & Foods Nutrition Research Center, Pukyong National University, 45 Yongso-ro, Nam-gu, Busan 48513, Korea
³Advanced Biomass R&D Center, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Korea
⁴, Korea
⁵Department of Civil and Environmental Engineering, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Korea

E-mail:

Seawater, when supplemented to a growth medium, appears to stimulate auto-flocculation of a certain microalgae species like Scenedesmus obliquus and thus renders its harvesting easy. To make use of this unique response for the purpose of biomass harvesting, S. obliquus was grown in a seawater-added medium and then collected in electrochemically-mediated ways. Significantly higher harvesting efficiency and energy saving were observed with electroflotation (EF) than with electro-coagulation-flotation (ECF) and the standard BG11 medium. An optimal EF condition, the highest recovery rate with least energy use, was found with a supply of 0.5 A. Seawater amendment was most beneficial in a level of 10%. All this clearly showed that applying EF to cells cultivated in the seawater-supplemented medium is a promising harvesting means that enables one to obtain algae biomass without interfering with the downstream process of biodiesel production.

Keywords:Scenedesmus obliquus;Harvest;Seawater;Electro-flotation (EF);Electro-coagulation-flotation (ECF)

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[12] Brennan L, Owende P, Renew. Sust. Energ. Rev., 14, 557 (2010)

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[17] Misra R, Guldhe A, Singh P, Rawat I, Bux F, Chem. Eng. J., 255, 327 (2014)

[18] Jung JY, Lee H, Shin WS, Sung MG, Kwon JH, Yang JW, Bioprocess. Biosyst. Eng., 38, 449 (2015)

[19] Alfafara CG, Nakano K, Nomura N, Igarashi T, Matsumura M, J. Chem. Technol. Biotechnol., 77(8), 871 (2002)

[20] Lee S, Ang WS, Elimelech M, Desalination, 187(1-3), 313 (2006)

[21] Poelman E, DePauw N, Jeurissen B, Resour. Conserv. Recycl., 19, 1 (1997)

[22] Grima EM, Belarbi EH, Fernandez FGA, Medina AR, Chisti Y, Biotechnol. Adv., 20, 491 (2003)

[23] Kim J, Ryu BG, Kim K, Kim BK, Han JI, Yang JW, Bioresour. Technol., 123, 164 (2012)