TY - JOUR
T1 - Microwave-assisted low-temperature hydrothermal treatment of red seaweed (Gracilaria lemaneiformis) for production of levulinic acid and algae hydrochar
AU - Cao, Leichang
AU - Yu, Iris K.M.
AU - Cho, Dong Wan
AU - Wang, Di
AU - Tsang, Daniel C.W.
AU - Zhang, Shicheng
AU - Ding, Shiming
AU - Wang, Linling
AU - Ok, Yong Sik
N1 - Funding Information:
The authors appreciate the financial support from the Hong Kong Research Grants Council [PolyU 15217818], Environment and Conservation Fund [K-ZB78], and Hong Kong International Airport Environmental Fund [K-ZJKC].
Funding Information:
The authors appreciate the financial support from the Hong Kong Research Grants Council [ PolyU 15217818 ], Environment and Conservation Fund [ K-ZB78 ], and Hong Kong International Airport Environmental Fund [ K-ZJKC ].
Publisher Copyright:
© 2018 Elsevier Ltd
PY - 2019/2
Y1 - 2019/2
N2 - 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 °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 °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 × 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%).
AB - 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 °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 °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 × 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%).
KW - Acid hydrolysis
KW - Carbohydrate-rich biomass
KW - Engineered biochar
KW - Food waste valorization
KW - Macroalgae biorefinery
UR - http://www.scopus.com/inward/record.url?scp=85056598414&partnerID=8YFLogxK
U2 - 10.1016/j.biortech.2018.11.013
DO - 10.1016/j.biortech.2018.11.013
M3 - Article
C2 - 30448676
AN - SCOPUS:85056598414
SN - 0960-8524
VL - 273
SP - 251
EP - 258
JO - Bioresource Technology
JF - Bioresource Technology
ER -
