Study of the biodegradability of Azo dye by bacteria and Aspergillus niger

Azo dyes are one of the most important kinds of dyes used in the textile industries. One of the most determined characteristics of them is having one or more Azo groups (N = N), which act as a bridge between two organic parts. It should be noted that at least one of these groups is aromatic. They are synthetic colorants pollutants released into the wastewater during textile processing in industries and pollute the environment. One of the best ways for solving this environmental problem is wastewater purification by the microorganisms. In this study, the degradation of Azo Orange 7 by using Aspergillus niger and different bacteria have been investigated. Removing the dye was determined by a spectrophotometer. The results show that by using Aspergillus niger and gram-positive bacterium Corynebacterium, 95 and 83 percentage of the dye areremoved, respectively. Increasing the weight of the fungus mycelium and the growth of bacteria are enhanced by increasing of dye s concentrations. These microorganisms probably have biodegradability of an Azo dye as a source of the essential nutrient

کلیدواژه ها:

Biodegradation ، Azo dye ، Bacteria ، Aspergillus niger