[Degradation of the Disperse Dye Neocron Black(NB) by Biological Treatment].

The biodegradation characteristics of the azo disperse dye neocron black (NB) were investigated under aerobic, anaerobic and anaerobic/aerobic conditions separately with the activated sludge system, and the biological degradation process of the dye was analyzed by spectrophotometry and gas chromatography mass spectrometry (GC-MS). The results showed that the degradation efficiency of NB dye was the highest under fully aerobic conditions, followed by the anaerobic/aerobic conditions, and fully anaerobic condition was the lowest. With the increase of the concentration of NB dye, the dye and the intermediate metabolite greatly decreased the microbial degradation efficiency of NB dye. The addition of carbon source could not only promote the biodegradation of NB dye, but also change the kinetic characteristics of the biodegradation process. The spectrophotometry and GC-MS determination results showed that the chromophore was completely degraded after biodegradation of NB dye. The intermediates metabolites of NB dye included 2,4-Dinitroaniline, 2-cyano-4-nitro aniline, p -Nitroaniline etc.