Microwave-assisted low-temperature hydrothermal treatment of red seaweed (Gracilaria lemaneiformis) for production of levulinic acid and algae hydrochar
- Authors
- Cao, Leichang; Yu, Iris K. M.; Cho, Dong-Wan; Wang, Di; Tsang, Daniel C. W.; Zhang, Shicheng; Ding, Shiming; Wang, Linling; Ok, Yong Sik
- Issue Date
- 2월-2019
- Publisher
- ELSEVIER SCI LTD
- Keywords
- Macroalgae biorefinery; Carbohydrate-rich biomass; Acid hydrolysis; Food waste valorization; Engineered biochar
- Citation
- BIORESOURCE TECHNOLOGY, v.273, pp.251 - 258
- Indexed
- SCIE
SCOPUS
- Journal Title
- BIORESOURCE TECHNOLOGY
- Volume
- 273
- Start Page
- 251
- End Page
- 258
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/68205
- DOI
- 10.1016/j.biortech.2018.11.013
- ISSN
- 0960-8524
- Abstract
- In this study, red seaweed (Gracilaria lemaneiformis) food waste with high carbohydrate content was valorized into levulinic acid (LA) and algae hydrochar through microwave-assisted low-temperature hydrothermal treatment in dilute acid solution. Various parameters including treatment temperature (160-200 degrees C), reaction time (1-40 min), acid concentration (0-0.6 M), and biomass-to-liquid ratio (1%-10%, w/v) were examined. The energy efficiency and carbon recovery of the proposed process were investigated. Under the experimental conditions of 5% (w/v) biomass loading, 0.2 M H2SO4, 180 degrees C, and 20 min, the highest levulinic acid yield of 16.3 wt% was produced. The resulting hydrochar showed approximately 45-55% energy yield and higher heating values of 19-25 MJ kg(-1). The energy efficiency of the present study (1.31 x 10(-6)g LA/J) was comparable to those of the conventional hydrothermal treatment of lignocellulosic biomass, while the reaction time (20 min) was much shorter with a high carbon recovery (73.3%).
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Collections - College of Life Sciences and Biotechnology > Division of Environmental Science and Ecological Engineering > 1. Journal Articles
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