Enhanced bio-ethanol production from Chlorella sp. biomass by hydrothermal pretreatment and enzymatic hydrolysis

Marika Ngamsirisomsakul, Alissara Reungsang, Qiang Liao and Mallika Boonmee Kongkeitkajorn

Renewable Energy, 2019, vol. 141, issue C, 482-492

Abstract: Microalgae are considered a third generation feedstock for biofuel production. Apart from lipid accumulation, some microalgae also accumulate carbohydrates which could be extracted and used as substrate for other biofuels production. This research aimed to assess potential of biomass of microalgae, Chlorella sp., for its potential as a feedstock for ethanol production. Response surface analysis was used to determine the conditions for pretreatment of microalgae biomass by acid-hydrothermal. The analysis suggested the use of 20% biomass in 1.5% sulfuric acid at 117 °C for 20 min as suitable for the pretreatment as it resulted in the maximum ethanol of 5.62 ± 0.16 g/L, which was 3.5 times higher compared with using untreated biomass. Enhanced ethanol production was investigated by hydrolyzing the pretreated slurry with α-amylase and glucoamylase. Using glucoamylase alone was enough for hydrolyzing the slurry to improve ethanol production. By using 25 Unit/galgae of glucoamylase, ethanol produced from the hydrolysate increased to 10.58 ± 0.34 g/L or 52.88 ± 1.69 mg/galgae. Enhancing ethanol production from Chlorella sp. biomass by hydrolyzing the acid-hydrothermal pretreated slurry with glucoamylase resulted in a total of 7.1 times increase in ethanol production from Chlorella sp. biomass as compared with the use of the biomass without any treatment.

Keywords: Biofuels; Bioethanol; Chlorella sp.; Acid-hydrothermal; Amylase hydrolysis (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (7)

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S0960148119304847
Full text for ScienceDirect subscribers only

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:141:y:2019:i:c:p:482-492

DOI: 10.1016/j.renene.2019.04.008

Access Statistics for this article

Renewable Energy is currently edited by Soteris A. Kalogirou and Paul Christodoulides

More articles in Renewable Energy from Elsevier
Bibliographic data for series maintained by Catherine Liu ().