Anaerobic-Aerobic Combined System for the Biological Treatment of Azo Dye Solution using Residual Yeast

This study aimed to investigate the treatment efficiency of a synthetic dye solution in an anaerobic-aerobic combined reactor system, using pretreated residual yeast as a nutrient source and redox mediator. The applicability of the residual yeast as a nutrient source was firstly evaluated in anaerob...

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Bibliographic Details
Published in:Water environment research 2018-08, Vol.90 (8), p.729-737
Main Authors: Bahia, Marina, Passos, Fabiana, Adarme, Oscar F. H., Aquino, Sergio F., Silva, Silvana Q.
Format: Article
Language:English
Subjects:
Activated sludge
Anaerobic treatment
azo dye
Azo dyes
biodegradation
Biological treatment
Chemical oxygen demand
Color removal
Dyes
Gold
Mineral nutrients
Nutrients
Organic chemistry
Oxidoreductions
Polishing
Ponds
Reactors
Removal
residual yeast
Sludge
textile effluent
Upflow anaerobic sludge blanket reactors
Yeast
Yeasts
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Summary:This study aimed to investigate the treatment efficiency of a synthetic dye solution in an anaerobic-aerobic combined reactor system, using pretreated residual yeast as a nutrient source and redox mediator. The applicability of the residual yeast as a nutrient source was firstly evaluated in anaerobic batch tests. Subsequently, two continuous bench-scale treatment settings were studied: (1) an Upflow Anaerobic Sludge Blanket (UASB) reactor followed by an activated sludge system and, (2) a UASB reactor followed by a shallow polishing pond. The two system configurations were fed with a synthetic azo dye solution of Yellow Gold Remazol (50 mg/L) and pretreated residual yeast (350 mg/L). According to the results, the UASB/shallow polishing pond-combined reactor attained the best values of chemical oxygen demand (COD) (85%) and dye removal (23%).
ISSN:1061-4303
1554-7531
DOI:10.2175/106143017X15131012153167