High-throughput integrated pretreatment strategies to convert high-solid loading microalgae into high-concentration biofuels
| Autor: | El-Sayed Salama, Soon Woong Chang, Mayur B. Kurade, Yongtae Ahn, Bikram Basak, Min Kyu Ji, Geon Soo Ha, Gyeong Uk Kim, Byong-Hun Jeon, Shouvik Saha |
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| Rok vydání: | 2021 |
| Předmět: |
Biodiesel
Environmental Engineering Esterification Renewable Energy Sustainability and the Environment Chemistry Extraction (chemistry) Energy conversion efficiency food and beverages Biomass Bioengineering General Medicine Transesterification Pulp and paper industry Lipids complex mixtures Biofuel Biofuels Microalgae Specific energy Fermentation Waste Management and Disposal |
| Zdroj: | Bioresource Technology. 340:125651 |
| ISSN: | 0960-8524 |
| DOI: | 10.1016/j.biortech.2021.125651 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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