Application of residual yeast as a source of redox mediators for the anaerobic decolorization of a model azo dye.
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2016
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This work investigated the anaerobic degradation of the model azo dye Remazol Yellow Gold
RNL in batch reactors using discharged residual yeast as the source of redox mediators (RM). Two yeast lysis
methods (mechanical lysis and sonication) were tested and optimized to produce a riboflavin-rich yeast lysate.
The reactors were operated at 25 oC for 48 hours, evaluating the effect of external carbon source (glucose) and
RM (from residual yeast lysate and commercial yeast extract) addition. The results showed that color removal
efficiencies for the batch reactors fed with commercial yeast extract reached 90%, whereas those fed with
discharged yeast lysate reached 80% (sonication) and 73% (mechanical lysis). These values were statistically
higher when compared to reactors operating without RM (48 to 66%), demonstrating that yeast extract
enhances azo dye degradation in anaerobic conditions and that the residual yeast is a cheap and alternative
source of carbon and of the RM riboflavin.
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Anaerobic digestion, Riboflavin, Residual yeast
Citação
VICTRAL, D. M. et al. Application of residual yeast as a source of redox mediators for the anaerobic decolorization of a model azo dye. Brazilian Journal of Chemical Engineering, São Paulo, v. 33, n. 4, p. 705-711, out./dez. 2016. Disponível em: <http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0104-66322016000400705>. Acesso em: 15 set. 2017.