Degradation of acid orange 7 (AO7) by a bacterium strain Flavobacterium mizutaii L-15

Acid orange 7 (AO7) is an azo dye widely used in the dyeing and direct printing industry. AO7 is an environmental pollutant because the cleavage of azo bonds produces aromatic amines, which are considered mutagenic and carcinogenic. Microbial degradation is one of the most effective methods to remov...

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Bibliographic Details
Published in:Water science and technology 2020-07, Vol.82 (2), p.266
Main Authors: Xiuyan, Liu, Ji, Zhang, Hancheng, Mao, Fanyi, Kong, Cong, Teng, Jingang, Huang, Chuyan, Yu, Xiangyang, Xu, Sheng, Teng
Format: Article
Language:English
Subjects:
Acids
Amines
Aromatic compounds
Azo Compounds
Azo dyes
Bacteria
Benzenesulfonates
Biochemical characteristics
Biochemistry
Biodegradation
Carbon
Carcinogens
Coloring Agents
Decoloring
Degradation
DNA
Dyeing
Dyes
Flavobacterium
High temperature
Microbial degradation
Microorganisms
Morphology
Orange II
Phylogenetics
Physical characteristics
Physiology
Pollutant removal
Pollutants
Printing industry
rRNA 16S
Strain analysis
Wastewater treatment
Water treatment
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Summary:Acid orange 7 (AO7) is an azo dye widely used in the dyeing and direct printing industry. AO7 is an environmental pollutant because the cleavage of azo bonds produces aromatic amines, which are considered mutagenic and carcinogenic. Microbial degradation is one of the most effective methods to remove environmental pollutants. A bacterium strain L-15 was isolated from the wastewater treatment system of a dye manufacturer. This strain is capable of decolorizing AO7. The strain was identified as Flavobacterium mizutaii based on its morphological, physiological and biochemical characteristics, and the sequence of 16S rDNA. The AO7-degrading characteristics and the effects of culture condition on the degrading efficiency of the strain were investigated by shake-flask culturing. The optimal degradation condition of L-15 was 30 °C and pH 7.0. After culturing at 30 °C for 3 days with the initial AO7 concentration of 20 mg/L, the degradation rate of AO7 was 60.45%. The optimal salt concentration was lower than 2%.
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.2020.127