The removal of CI Basic Red 46 in a mixed methanogenic anaerobic culture

Abstract

The removal of C.I. Basic Red 46 (BR 46) was investigated with anaerobic mixed culture using glucose (3000 mg l(-1) COD) as carbon source and electron donor. Zero-, first- and second-order reaction kinetics were used to find out the suitable substrate removal and decolorization kinetics. The substrate removal (COD) process is suitable for first-order reaction kinetic among the kinetic models studied. Increases in dye concentrations from 0 to 1000 mg l(-1) decrease the degradation rate constant (k(l)) values from 0.0083 to 0.0032 h(-1) in batch experiments carried out with BR 46. Decolorization process approximates to first-order kinetic at 50, 100 and 250 ng l(-1) of BR 46, and to zero-order kinetic at 500, 750, 1000 mg l(-1) of BR 46 concentration. Substrate and color removal rates (mg l(-1) h(-1)) were found to be 8.07, 7.78, 7.64, 7.23, 6.39, 5.98, 5.28 and 0.66, 1.37, 3.48. 4.95, 6.30, 5.99, respectively, in all serum bottles throughout incubation period. (c) 2006 Elsevier Ltd. All rights reserved.