Fate and Effect of Azo Dye on an Anaerobic-Aerobic System
Azo compounds are one of the oldest industrially synthesized organic compounds. Azo dyes form a large group of synthetic colorants used in dye applications. These dyes are widely used in textile, printing, drug, and food processing industries.' The structure of an azo compound consists of the azo group (-N = N-) in association with one or more aromatic rings. Some azo dyes are classified as toxic compounds and suspected of carcinogenicity.'