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Anaerobic‐Aerobic Combined System for the Biological Treatment of Azo Dye Solution using Residual Yeast
Author(s) -
Bahia Marina,
Passos Fabiana,
Adarme Oscar F. H.,
Aquino Sergio F.,
Silva Silvana Q.
Publication year - 2018
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/106143017x15131012153167
Subject(s) - chemical oxygen demand , anaerobic exercise , bioreactor , yeast , chemistry , pulp and paper industry , biochemical oxygen demand , residual , sewage treatment , nuclear chemistry , environmental engineering , environmental science , biochemistry , biology , organic chemistry , mathematics , physiology , algorithm , engineering
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%).