Author(s)

Da Shen, Dongjin Leng, Cong Li, Congrong Wu, Daizong Cui^*

College of Life Science, Northeast Forestry University, Harbin, China.

In the present study, the effects of various quinone compounds on the decolorization rates of azo dyes by the E. coli strain CD-2 were investigated. The results showed that Lawsone was the most effective redox mediator. The optimum concentration for Lawsone is 0.1 mmol/L. The effects of physic-chemical parameters on the Methyl Orange degradation by the strain were determined. The results indicated that, in the quinone mediated decolorization system, strain CD-2 exhibited a good degradation ability in the range of pH from 4 to 9, temperature from 20°C to 50°C and salinity from 1% to 6%. With Lawsone as a redox mediator, a broad spectrum of azo dyes with different structures could be decolorized by the strain. All the results showed that the addition of a redox mediator can be valuable for treating dye-colored wastewaters.

Azo Dyes, Anaerobic Decolorization, Anthraquinone Mediator

Shen, D. , Leng, D. , Li, C. , Wu, C. and Cui, D. (2016) Effect of Quinoid Mediators on the Decolorization of Azo Dyes by the Strain CD-2. Advances in Chemical Engineering and Science, 6, 335-344. doi: 10.4236/aces.2016.64034.