COMBINING AEROBIC DENITRIFIER BACTERIA WITH WHITE-ROT FUNGI IMMOBILIZED BY BACTERIAL CELLULOSE TO TREAT DYE WASTEWATER

摘要

The treatment of dye wastewater with white-rot fungi depending on its specific degradation mechanisms has been reported widely. Many treatments were confined to a single bioreactor and the removal rate of CODcr was unfavorable. Aerobic denitrifier bacteria have a preferable removal effect on CODcr. Therefore, the aerobic denitrifier bacteria and white-rot fungi immobilized by bacterial cellulose were used to treat malachite green dye wastewater, and the mixed dye wastewater in the first part. It was found that the decolorization rates with white-rot fungi were better than with aerobic denitrifier bacteria, and the maximum decolorization rates of two wastewaters were 97 and 85%, respectively. The CODcr removal rates of two wastewaters with aerobic denitrifier bacteria could reach 85 and 83% (increased by >30% than with white-rot fungi). Considering the advantages and disadvantages of two strains, the combination of immobilized aerobic denitrifier bacteria and white-rot fungi was used to treat the mixed dye wastewater, and a prominent and steady treatment effect was shown. The removal rates of chromaticity and CODcr were 89 and 88%, indicating that the combination of immobilized aerobic denitrifier bacteria and white-rot fungi to treat the dye wastewater has more advantages than the above immobilized single strain. The application of bacterial cellulose as immobilizing carrier easily achieved not only solid-liquid separation and recycling of strains, but also decreased secondary pollution. It provided a wild application prospect for improving the treatment efficiency of dye wastewater.