Bioethanol Production From Dry Ulva Lactuca Algae by Alcoholic Fermentation

Abstract

This study focuses on alcoholic Sacharomyces cerevisiae yeast fermentation of suspensions from Ulva lactuca sp. powder, after the enzymatic hydrolysis of polysaccharides with Aspergillus niger cellulase. Bioethanol production from algae is a complex process, depending mainly on the content of fermentable sugars in the raw material. The drying process is an important step in treating fresh algae harvested from the sea, in order to prevent algae gelling. In order to investigate the effect of process factors, a 2 4 factorial experiment was designed. The effect of the following factors was studied: solid to liquid ratio (S = 1/12 and 1/24), cellulase ratio (U = 8 and 16 U/g d.m.), alcoholic fermentation temperature (t = 25 and 35 °C) and mean particle diameter (M = 304 and 1279 µm). The mathematical model predicting the yield of volatile compounds (V) and ethanol (E) in g/g d.m. was obtained by regression.

Fermentation of micro- and macroalgae as a way to produce value-added products

“… Ethanol Fermentation in liquid phase at pH 5.5 30 °C, 24 h [114] Sacharomyces cerevisiae Ulva lactuca sp. Green algae Bioethanol Fermentation in liquid phase at 25–35 °C, 24 h [115] Saccharomyces cerevisiae Rhizoclonium sp. Green algae Ethanol Fermentation in liquid phase at pH 5.5, 25 °C, 54 h [116] …”

“…Saccharomyces cerevisiae is the most productive in bioethanol production. The process should be carried out for 24–54 h at 25–35 °C [ 115 , 116 ].…”

Biofuel Generation by Macro and Micro Algae as a Renewable Energy Source: A Systematic Review

“…For fermentation process, the biomass which contains sufficient amount of sugar must be dried, crushed and then water is added along with yeast S143 into bioreactor for ethanol production (Qi Ji et al, 2016). For the fermentation process, the required optimum temperature is 25 or 35 °C for 24 hours' incubation period under anaerobic conditions (Cioroiutîrpan et al, 2019).…”