High-throughput integrated pretreatment strategies to convert high-solid loading microalgae into high-concentration biofuels
- Authors
- Ha, Geon-Soo; Saha, Shouvik; Basak, Bikram; Kurade, Mayur B.; Kim, Gyeong-Uk; Ji, Min-Kyu; Ahn, Yongtae; Salama, El-Sayed; Chang, Soon Woong; Jeon, Byong-Hun
- Issue Date
- Nov-2021
- Publisher
- ELSEVIER SCI LTD
- Keywords
- Microalgal biorefinery; High titer biofuel; Integrated pretreatment; Waste management; Cell disruption
- Citation
- BIORESOURCE TECHNOLOGY, v.340, pp.1 - 10
- Indexed
- SCIE
SCOPUS
- Journal Title
- BIORESOURCE TECHNOLOGY
- Volume
- 340
- Start Page
- 1
- End Page
- 10
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/140573
- DOI
- 10.1016/j.biortech.2021.125651
- ISSN
- 0960-8524
- Abstract
- The commercial feasibility of energy-efficient conversion of highly concentrated microalgal suspensions to produce high-titer biofuels is a major bottleneck due to high energy consumption. Herein, high-titer biofuels (bioethanol, higher-alcohols, and biodiesel) were generated from carbohydrate-rich Chlamydomonas mexicana and lipid-rich Chlamydomonas pitschmannii biomass through energy-saving microwave pretreatment, successive fermentation, and transesterification. Microwave pretreatment needed low specific energy (4.2 MJ/kg) for 100 g/L of microalgal suspension. Proposed sustainable integrated pretreatments method achieved unprecedented total conversion efficiency (67%) and highest biomass utilization (87%) of C. pitschmannii (100 g/L) with high yields of bioethanol (0.48 g-ethanol/g-carbohydrates), higher-alcohols (0.44 g-higher-alcohols/g-proteins), and biodiesel (0.90 g-biodiesel/g-lipids). Transmission electron microscopy showed the changes in the microalgal cellular integrity before and after sequential fermentations. Energy-efficient integrated pretreatments enhanced the extraction efficiency and whole utilization of high-concentration microalgae to generate high-titer biofuels with minimum waste production.
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