Screening of decolorizing bacteria for treatment of textile printing and dyeing wastewater containing carplon red R4 and decolorization conditions thereof

A preponderant bacteria X1 for decolorization of carplon red R4 dye was screened and separated from activated sludge of a textile printing and dyeing plant.Through a 96-hour decolorization cultivation under the condition that the temperature was 30 ℃,the velocity was 200 r / min,the mass concentration of the dye was 5 mg / L,the inoculation quantity was 6 mL,the culture medium′s pH value was natural,the decolorization rate reached the highest level which was 68.4%.Treating the textile printing and dyeing wastewater whose COD and BOD5 mass concentration were 85 and 21 mg / L respectively and OD520 value was 0.23 under the above condition,the mass concentration of COD and BOD5 of the effluent water after the decolorization were 5.8 and 2.90 mg / L respectively,the OD250 value was 0.