Optimization of a bacterial consortium for nitrobenzene degradation

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- By: , , , , ,

Courtesy of IWA Publishing

Three bacterial strains, Arthrobacter sp. NB1, Serratia sp. NB2 and Stenotrophomonas sp. NB3, were isolated from contaminated sludge by using nitrobenzene as a sole source of carbon and nitrogen. It was observed that all three strains could degrade nitrobenzene at 400 mg/L initial concentration and mixed-cultivation of these strains could enhance the degradation of nitrobenzene compared with mono-cultivation. Mixture design was used for adjusting the proportions of each strain and the optimal ratio of inoculation size was NB1:NB2:NB3 = 4:4:5, where the nitrobenzene degradation percentage was two times higher than for by the single strain. The results of Plackett-Burman design indicated that Mg2+, Ca2+, Fe2+, Zn2+ and Mn2+ had a positive effect on the degradation of nitrobenzene, while Cu2+ and Co2+ had a negative effect on it.

Keywords: bacterial consortium, degradation, mixture design, nitrobenzene, Plackett-Burman design

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