title: Anaerobic degradation of azo dye Drimaren blue HFRL in UASB reactor in the presence of yeast extract a source of carbon and redox mediator.
abstract: This paper presents results on anaerobic degradation of the azo dye blue HFRL in a bench scale Upflow anaerobic sludge blanket (UASB) reactor operated at ambient temperature. The results show that the addition of yeast extract (500 mg/L) increased color removal (P < 0.05) from 62 to 93% despite the low chemical oxygen demand (COD) removal (~35%) which happened due to volatile fatty acids (VFA) accumulation. There were no differences in color removal (~91%) when yeast extract (500 mg/L) was used in the presence or absence of glucose, suggesting that yeast extract acted as source of redox mediator (riboflavin) and carbon. The specific rate of dye removal increased along the operational phases and depended on the presence of yeast extract, suggesting progressive biomass acclimatization. Analysis of bacterial diversity by Polymerase Chain Reaction-Denaturing Gradient Gel Electrophoresis (PCR-DGGE) method showed there was biomass selection along the bioreactor operation and no evidence of azo dye degrading bacteria predominance. This strengthens the hypothesis that color removal happens extracellularly by the reduction of azo bond by reduced redox mediators, such as riboflavin, which is present in high amount in the yeast extract.
authors.affiliation: Chemistry Department, Federal University of Ouro Preto, Ouro Preto, Brazil.
authors.forename: B E L
authors.initials: BE
authors.lastname: Baêta
authors.forename: S F
authors.initials: SF
authors.lastname: Aquino
authors.forename: S Q
authors.initials: SQ
authors.lastname: Silva
authors.forename: C A
authors.initials: CA
authors.lastname: Rabelo
mesh_terms: D000693:Anaerobiosis / Q000187:drug effects; D000880:Anthraquinones / Q000378:metabolism*; D001391:Azo Compounds / Q000378:metabolism*; D001419:Bacteria / Q000187:drug effects / Q000235:genetics; D001483:Base Sequence; D001673:Biodegradation, Environmental / Q000187:drug effects; D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors / Q000382:microbiology*; D002244:Carbon / Q000494:pharmacology*; D003116:Color; D004396:Coloring Agents / Q000378:metabolism*; D004275:DNA, Ribosomal / Q000235:genetics; D058645:Denaturing Gradient Gel Electrophoresis; D005232:Fatty Acids, Volatile / Q000032:analysis; D006863:Hydrogen-Ion Concentration / Q000187:drug effects; D010084:Oxidation-Reduction / Q000187:drug effects; D012212:Rheology / Q000187:drug effects; D012722:Sewage / Q000382:microbiology*; D012995:Solubility / Q000187:drug effects; D013696:Temperature; D014753:Vinyl Compounds / Q000378:metabolism*; D014865:Waste Disposal, Fluid; D015003:Yeasts / Q000378:metabolism*
chemical_list: D000880:Anthraquinones; D001391:Azo Compounds; D004396:Coloring Agents; D004275:DNA, Ribosomal; D005232:Fatty Acids, Volatile; D012722:Sewage; D014753:Vinyl Compounds; C069622:Drimarene brilliant blue; D002244:Carbon