4.2 Article

SPENT BLACK LIQUOR AS AN ALTERNATIVE CARBON SOURCE FOR THE SYNTHESIS OF BACTERIAL CELLULOSE

Journal

CELLULOSE CHEMISTRY AND TECHNOLOGY
Volume 56, Issue 7-8, Pages 749-756

Publisher

EDITURA ACAD ROMANE
DOI: 10.35812/CelluloseChemTechnol.2022.56.66

Keywords

Acetobacter xylinum; bacterial cellulose; Hestrin-Schramm culture; spent liquor

Funding

  1. Biosystems and Bioproducts Laboratory of Shahid Beheshti University

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This study found that spent black liquor from cotton pulping can be used as an alternative carbon source for the production of bacterial cellulose. The produced bacterial cellulose had high purity and nano-size. The structure of bacterial cellulose can be controlled by altering the culture media.
Bacterial cellulose is identical in chemical composition to cellulose extracted from lignocellulosic biomass, but with partial difference in structural characteristics. These differences, specifically its purity, make it valuable, but its production processes are quite expensive. In the present work, spent black liquor resulting from cotton pulping, as a major industrial waste stream, was investigated as an alternative carbon source in the production of bacterial cellulose (BC) using Acetobacter xylinum. XRD results of the produced cellulose showed that the crystallinity of the BC was lower than that of cotton pulp alpha-cellulose. SEM evaluation confirmed the nano-size of the produced cellulose, while its structure was evidenced by FT- IR analysis. The effect of altering the culture media on some structural features of the produced BC was thoroughly discussed and it was suggested that the spent liquor could be added in amounts of up to 25% for BC production in standard cultures (HS).

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