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Economic co-production of cellulosic ethanol and microalgal biomass through efficient fixation of fermentation carbon dioxide
(2024-03-01)
Liu, Linpei
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Zhou, Zheng
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Gong, Guiping
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Wu, Bo
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Todhanakasem, Tatsaporn
An integrated process for the co-production of cellulosic ethanol and microalgal biomass by fixing CO<inf>2</inf> generated from bioethanol fermentation is proposed. Specifically, over one-fifth of the fermentative carbon was converted into high-purity CO<inf>2</inf> during ethanol production. The optimal concentration of 4 % CO<inf>2</inf> was identified for the growth and metabolism of Chlorella sp. BWY-1. A multiple short-term intermittent CO<inf>2</inf> supply system was established to efficiently fix and recycle the waste CO<inf>2</inf>. Using this system, economical co-production of cellulosic ethanol by Zymomonas mobilis and microalgal biomass in biogas slurry wastewater was achieved, resulting in the production of ethanol at a rate of 0.4 g/L/h and a fixed fermentation CO<inf>2</inf> of 3.1 g/L/d. Moreover, the amounts of algal biomass and chlorophyll a increased by over 50 % and two-fold, respectively. Through techno-economic analysis, the integrated process demonstrated its cost-effectiveness for cellulosic ethanol production. This study presents an innovative approach to a low-carbon circular bioeconomy.
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Catalytic conversion of bioethanol to value-added chemicals and fuels: A review
(2022-03-01)
Xiang, Huan
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Xin, Ruojia
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Prasongthum, Natthawan
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Natewong, Paweesuda
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Sooknoi, Tawan
Bioethanol produced via valorisation of renewable biomass is of great interest to many industries. The increased availability and decreased cost of bioethanol make it a promising platform molecule to produce a wide range of value-added chemicals and fuels via the catalytic conversions. This paper provides a comprehensive review of catalytic conversions of bioethanol to a variety of chemicals/fuels such as hydrogen, C<inf>2</inf>–C<inf>4</inf> olefins, gasoline and small oxygenates. Specifically, the focus was placed on the relationship between the catalyst property (such as pore structure, acidity, active metal sites, and catalyst supports) and the catalytic performance (including catalyst activity and stability), as well as the reaction mechanisms involved. Future research avenues on the catalyst design for improving catalytic valorisation of bioethanol are also discussed.
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Fermentation of xylose, arabinose, glucose, their mixtures and sugarcane bagasse hydrolyzate by yeast Pichia stipitis for ethanol production
(2020-02-01)
Phaiboonsilpa, Natthanon
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Chysirichote, Teerin
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Champreda, Verawat
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Laosiripojana, Navadol
Xylose, arabinose and glucose were studied their fermentabilities to ethanol by yeast Pichia stipitis. The experiments were conducted by using 1.0, 5.0, 10.0 and 20.0 g/l of mono-saccharide solutions in a close fermentation system at 30 °C with 100-rpm shaking rate for 120 h. Fermentabilities of mono-saccharides appeared to produce high ethanol yield when a low concentration of xylose and arabinose was applied. Glucose fermentability was, however, found to be preferable at high sugar concentration. The highest ethanol yields could be achieved at 106.27, 86.25, and 73.10%, reported as a relative % to its theoretical ethanol yield, by using 1.0 g/l of xylose, 1.0 g/l of arabinose, and 20.0 g/l of glucose solutions, respectively. The empirical equations were then established based on the fementabilities obtained to predict ethanol yield for a given concentration of mono-saccharides. A comparative study on fermentation of the mono-saccharide mixture and sugarcane bagasse hydrolyzate, of which xylose, arabinose and glucose concentrations were similar, were moreover conducted. It was revealed that the empirical equations provided an excellent estimation of ethanol concentration when the mono-saccharide mixture was used. The presence of furans and other compounds in sugarcane bagasse hydrolyzate besides the mono-saccharides, however, resulted in a lower ethanol fermentability compared with that calculated by the empirical equations. This is due apparently to an inhibition effect of these additional components to Pichia stipitis.
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Bioethanol fermentation from acid/base-treated water hyacinth biomass using fermentation yeasts saccharomyces cerevisiae yrk 017 and candida shehatae ATCC 22984
(2019-01-01)
Ochaikul, Duangjai
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Jongmeesuk, Atcharaporn
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Maneeruttanarungroj, Cherdsak
Water hyacinth is considered as one of most abundant lignocellulosic feedstock in Thailand. It has been selected as a substrate for producing ethanol at an economically feasible manner. This study focuses on the bioethanol production from enzyme-treated hydrolysate of acid/base pretreatment water hyacinth. Two different pretreatment methods of water hyacinth were used including either 2 %(v/v) sulfuric acid or 2 %(w/v) sodium hydroxide at 121°C for 15 min. After acid/base pretreatments, the biomass residues in order to release glucose molecules were treated with a commercial cellulase enzyme complex (ACCELLERASE® 1500) at a concentration of 0.30 mL enzyme/g biomass residue. Two yeast species consisting of Saccharomyces cerevisiae YRK 017 and Candida shehatae ATCC 22984 were separately used as inoculum in fermentation process of the hydrolysate from enzymatic treatments. The results showed that ethanol yield obtained from acid pretreatment was slightly higher than the yield from base pretreatment. In acid pretreatment, S. cerevisiae YRK 017 could produce bioethanol in a yield of 3.82 ± 0.10 g/L, whereas C. shehatae ATCC 22984 could produce yielding 2.85 ± 0.04 g/L.

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