Degradation of reactive dyes by ozonation and oxalic acid-assimilating bacteria isolated from soil.
Ozonation and treatment of wastewaters with oxalic acid-assimilating bacterium was attempted for the complete degradation of reactive dyes. Oxalic acid-assimilating bacterium, Pandoraea sp. strain EBR-01, was newly isolated from soil under bamboo grove and was identified to be a member of the genus Pandoraea by physicochemical and biochemical tests including 16S rDNA sequence analysis. The bacterium was grown optimally at pH 7 and temperature of 30 degrees C under the laboratory conditions. Reactive Red 120 (RR120), Reactive Green 19 (RG19), Reactive Black 5 (RB5) and Remazol Brilliant Blue R (RBBR) were used in degradation experiments. At the initial reactive dye concentrations of 500 mg/l and the ozonation time of 80 min, it was confirmed that 75-90 mg/l oxalic acid was generated from reactive dyes by ozonation. Microbial treatment using EBR-01 greatly decreased the amount of oxalic acid in the mixture after 48 h, but it was not removed completely. TOC/TOC(0) of reactive dye solutions was also decreased to 80-90% and 20-40% by ozonation and microbial treatment using EBR-01, respectively. The study confirmed that consecutive treatments by ozone and microorganisms are efficient methods to mineralize reactive dyes.
Kurosumi
Akihiro
A
Department of Life System, Institute of Technology and Science, University of Tokushima, 2-1 Minamijosanjia-cho, Tokushima, Japan.
Kaneko
Erika
E
Nakamura
Yoshitoshi
Y
D001419:Bacteria / Q000235:genetics / Q000254:growth & development / Q000378:metabolism*; D004396:Coloring Agents / Q000378:metabolism*; D019815:Oxalic Acid / Q000378:metabolism*; D010126:Ozone / Q000378:metabolism*; D012335:RNA, Ribosomal / Q000235:genetics; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D012988:Soil Microbiology
D004396:Coloring Agents; D012335:RNA, Ribosomal; D012336:RNA, Ribosomal, 16S; D010126:Ozone; D019815:Oxalic Acid