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Publications (3)0.36 Total impact

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    ABSTRACT: Combined ALR-BAC was used to treat bromoamine acid wastewater. The results showed that the ALR system could run steadily for over 1 months at the BAA concentration 650 mg x L(-1) after one-month acclimation, the decoloration rate of BAA was reached to about 90% within 12 h, and the removal rate of COD was about 50%, the precipitation performance of the suspended microorganism was good. When the influent bromoamine acid concentration was above 200 mg x L(-1), the decolorization products of BAA were easy to undergo auto-oxidation and the yellow intermediate products which were difficult to biodegrade were formed. The BAC process could inhibit the auto-oxidation of the decolorization products effectively, and the decolorization products could be biodegraded gradually. When there were no added sulphate, the concentrations of Br- and SO4(2-) were increased as the COD concentration reduced. Ultimately, the release rates of Br- and SO4(2-) were 72.2% and 66.9%, the COD removal efficiency was about 85.7%.
    Huan jing ke xue= Huanjing kexue / [bian ji, Zhongguo ke xue yuan huan jing ke xue wei yuan hui "Huan jing ke xue" bian ji wei yuan hui.] 10/2009; 30(10):2930-5.
  • Hai-xin Ai, Ji-ti Zhou, Hong Lü
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    ABSTRACT: A novel strain of Micrococcus sp. DUT_AHX, which was isolated from the sludge of a nitrobenzene (NB)-manufacturing plant and could utilize NB as the sole carbon source, was identified on the basis of physiological and biochemical tests and 16S ribosomal DNA (rDNA) sequence analysis. It can grow at the temperature up to 40 °C or in the presence of NaCl concentration up to 12 g/L in Luria-Bertani (LB) medium. The optimal degradation conditions are as follows: temperature 37 °C, pH 7.0, and shaking speed 150 r/min. The strain involves a partial reductive pathway due to the release of ammonia and can also utilize 2-aminophenol as the sole carbon source. Furthermore, the enzyme activity tests show that crude extracts of NB-grown strain DUT_AHX mainly contain 2-aminophenol 1, 6-dioxygenase activity. The exploitation of salt-tolerant bacteria will be a remarkable improvement in NB bioremediation and wastewater treatment at high salinity and high temperature.
    Journal of Central South University of Technology 01/2009; 16(2):230-235. · 0.36 Impact Factor
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    ABSTRACT: Enhanced biodecolourization of azo dyes by suspended and immobilized quinone-reducing community using kinds of anthraquinone dyes intermediators as redox mediators was investigated. The suspended bacterium community could enhance the biodecolourization of many kinds of azo dyes using bromoamine acid (BAA) as a redox mediator, the optimum conditions for Acid Red 3R were as follows: pH 6-9, glucose, BAA and initial dye concentrations 400-600 mg/L, 19-34.2 mg/L and < or = 900 mg/L, respectively. Under these conditions, the maximal decolourization rate was about 95%, which is reached within 7 h for suspended cells and 14 h for immobilized cells. However, the latter needed 38-57 mg/L BAA as a redox mediator. In addition, after 7 cycles without BAA addition, the decolourization rate of Acid Red 3R by immobilized cells retained over 85%.
    Huan jing ke xue= Huanjing kexue / [bian ji, Zhongguo ke xue yuan huan jing ke xue wei yuan hui "Huan jing ke xue" bian ji wei yuan hui.] 08/2008; 29(7):1986-91.