Journal
ALGAL RESEARCH-BIOMASS BIOFUELS AND BIOPRODUCTS
Volume 54, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.algal.2021.102193
Keywords
Heterotrophic algae cultivation; Enzymatic hydrolysis; Cellulases; Newspaper; Paper residue materials
Categories
Funding
- provincial government of Lower Austria [SC16-018]
- Austrian Science Fund through the Erwin Schrodinger Stipendium [J4014-N34]
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This study investigated the cellulases-catalyzed hydrolysis of paper slurries as carbon source in combination with digestate for the cultivation of Chlorella sorokiniana. The most efficient cultivation converted glucose into biomass, but high concentrations of glucose may be inhibited by a decrease in pH.
This study investigates the cellulases-catalyzed hydrolysis of newspaper waste and paper slurries as carbon source in combination with digestate from anaerobic digestion as nitrogen source for the heterotrophic cultivation of Chlorella sorokiniana. The enzymatic hydrolysis of paper slurries resulted in a hydrolysate containing 27.2 g l(-1) glucose reflecting a 78% cellulose conversion. A maximum Chlorella sorokiniana biomass yield of 3.64 g l(-1) was achieved within 91 h of cultivation under consumption of 9.7 g l(-1) glucose. The most efficient cultivation converted 1 g l(-1) glucose into 0.42 g l(-1) biomass. A strong decrease in pH of the batch cultures due to ammonium consumption and CO2 production by algae cells inhibited full glucose consumption for high concentrations of 17 g l(-1) glucose. Characterizing the amino acid content and pattern of the biomass revealed an amino acid fraction of 32.9% with Alanine as the most frequent amino acid.
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