Investigating flocculation mechanisms and ecological safety of cationic guar gum for rapid harvesting of microalgal cells.
Bioresour Technol
; 406: 130979, 2024 Aug.
Article
em En
| MEDLINE
| ID: mdl-38879054
ABSTRACT
Addressing the drawbacks of traditional flocculants on microalgae biomass harvesting is crucial for large-scale industrial applications of microalgae production. In this study, cationic bioflocculant was successfully prepared by introducing cationic groups into the side chain of guar gum, achieving in-situ algae flocculation efficiency of 83.5 % with the dosage of 18.0 mg/L under pH = 10.0. Through a harmonious integration of predictive modelling and practical experimentation, a superior cell flocculation capacity of 23.5 g/g was achieved. In addition, the environmental safety and biocompatibility of cationic guar gum was assessed, using the typical suspension quantitative bacteriostatic method and the fluorescent double-staining technique. The results showed that the inhibition efficiency of Staphylococcus aureus in the system containing 60.0 mg/L cationic guar gum was only 12.0 % and there was no inhibition against Escherichia coli colonies. These findings provide a safe and green flocculant for efficient microalgae harvesting and spent medium treatment.
Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Cátions
/
Gomas Vegetais
/
Microalgas
/
Floculação
/
Galactanos
/
Mananas
Idioma:
En
Ano de publicação:
2024
Tipo de documento:
Article