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The effect of carbon source on microbial community structure and Cr(VI) reduction rate
Author(s) -
Tekerlekopoulou Athanasia G.,
Tsiamis George,
Dermou Eftychia,
Siozios Stefanos,
Bourtzis Kostas,
Vayenas Dimitris V.
Publication year - 2010
Publication title -
biotechnology and bioengineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.136
H-Index - 189
eISSN - 1097-0290
pISSN - 0006-3592
DOI - 10.1002/bit.22837
Subject(s) - chemistry , sodium acetate , carbon fibers , sucrose , biomass (ecology) , carbon source , bioreactor , food science , chromatography , biology , organic chemistry , biochemistry , ecology , materials science , composite number , composite material
In the present work, the effect of the carbon source on microbial community structure in batch cultures derived from industrial sludge and hexavalent chromium reduction was studied. Experiments in aerobic batch reactors were carried out by amending industrial sludge with two different carbon sources: sodium acetate and sucrose. In each of the experiments performed, four different initial Cr(VI) concentrations of: 6, 13, 30 and 115 mg/L were tested. The change of carbon source in the batch reactor from sodium acetate to sucrose led to a 1.3–2.1 fold increase in chromium reduction rate and to a 5‐ to 9.5‐fold increase in biomass. Analysis of the microbial structure in the batch reactor showed that the dominant communities were bacterial species ( Acinetobacter lwoffii , Defluvibacter lusatiensis , Pseudoxanthomonas japonensis , Mesorhizium chacoense , and Flavobacterium suncheonense ) when sodium acetate was used as carbon source and fungal strains ( Trichoderma viride and Pichia jadinii ), when sodium acetate was replaced by sucrose. These results indicate that the carbon source is a key parameter for microbial dynamics and enhanced chromium reduction and should be taken into account for efficient bioreactor design. Biotechnol. Bioeng. 2010;107: 478–487. © 2010 Wiley Periodicals, Inc.