Abstract. Wastewater discharged from printing and dyeing plants on both sides of the Yangtze River seriously threatens the ecological and water security. Direct Blue 6 is a synthetic chemical dye and widely used in textile and dyeing industry. In this study, Pseudomonas aeruginosa HS-DY012 was used as a original strain in the decoloraziation of Direct Blue 6. Results indicated that HS-DY012 strain could completely decolorize and degrade 30 mg/L Direct Blue 6 dye in MSM medium within 18h culturing at 35 ℃ on a shaker at 120 rpm. The optimum condition of decolorization and degradation were determined, i.e. temperature at 35℃ and pH7.0, and the optimum concentration was 30 mg/L. HS-DY012 strain could effectually decolor seleted two type dyes both Reactive Black 5 and Congo red with a high degradation rate, as well as Acid scarled GR and Vat Yellow 2 could be decolored partially.These results indicated that HS-DY012 strain was a great degrader with a broad-spectrum dye decolorization character and it has a potential application.

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The principle of preparation of PFASS by using gangue was introduced in this paper. By examining indicators such as COD, SS and chrominance, the best dose and operating time were evaluated for waste water from Changing oil field. It was showed from the experiment that: PFASS produced from the technology mentioned in this paper had a good effect on the waste water in oil field; using PFASS produced from gangue to treat field water is a good way to fight against waste by waste.

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