Biotechnology and Bioprocess Engineering 2021; 26(6): 1002-1011  
Effects of Acid-fermented Food Wastewater in Microwave-based Direct Lipid Extraction from Wet Microalgae
Kyoung-Woo Kim, Hyeon-Jin Jeon, Jung-Hyeon Kim, Kyeong-Hwan Kang, and Im-Gyu Byun
Kyoung-Woo Kim, Hyeon-Jin Jeon, Jung-Hyeon Kim
School of Civil and Environmental Engineering, Pusan National University, Busan 46241, Korea
Kyeong-Hwan Kang, Im-Gyu Byun*
Institute for Environment and Energy, Pusan National University, Busan 46241, Korea
Tel: +82-51-510-7381; Fax: +82-51-581-5035
E-mail: big815@pusan.ac.kr
Received: September 27, 2020; Revised: March 22, 2021; Accepted: March 24, 2021; Published online: December 31, 2021.
© The Korean Society for Biotechnology and Bioengineering. All rights reserved.

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
This study examines two methods to enhance the efficiency of microwave (MW)-based lipid extraction from wet microalgae. The first method involved optimizing the MW conditions based on the energy efficiency, moisture contents of microalgae, MW power, and target temperature. The second was the application of food wastewater (FWW) as an ionic material and alternative solvent to increase the energy and cost efficiencies. The optimal conditions were an 83% moisture content, 400 W MW power, and 90oC target temperature. The addition of FWW improved the energy efficiency 1.4-fold compared to that without the addition of FWW. On the other hand, acid-fermented FWW had no significant effect as a polar solvent because of the high moisture content. Overall, optimization of the MW conditions and FWW addition could enhance the lipid extraction yield and energy efficiency.
Keywords: food wastewater, lipid extraction, microalgae, microwave, optimize


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