Textile wastewaters are rated among the most polluting of all
industrial sectors, both in terms of discharged volumes and composition,
but their most important environmental problems arise
from the high organic loads and the presence of color [1]. Azo
dyes are the most common synthetic colorants released in textile
wastewaters due to their ease of synthesis, stability and variety
of colors. Due to the electron-withdrawing nature of azo bonds,
azo dyes are easily reduced by bacteria under anaerobic conditions,
resulting in color removal with the formation of aromatic amines Key data on the health hazard associated with the majority of
these aromatic amines are limited ciated with the majority of
these aromatic amines are limited [4], but some of these azo dye
breakdown products have been considered of higher concern than
the original dye with respect to their possible (eco) toxicity and/or
mutagenicity/carcinogenicity Although these amines are generallynotfurtherdegradedanaerobically,theirpotentialfor
aerobic
biodegradation has been demonstrated for simple molecular structures
Textile wastewaters are rated among the most polluting of allindustrial sectors, both in terms of discharged volumes and composition,but their most important environmental problems arisefrom the high organic loads and the presence of color [1]. Azodyes are the most common synthetic colorants released in textilewastewaters due to their ease of synthesis, stability and varietyof colors. Due to the electron-withdrawing nature of azo bonds,azo dyes are easily reduced by bacteria under anaerobic conditions,resulting in color removal with the formation of aromatic amines Key data on the health hazard associated with the majority ofthese aromatic amines are limited ciated with the majority ofthese aromatic amines are limited [4], but some of these azo dyebreakdown products have been considered of higher concern thanthe original dye with respect to their possible (eco) toxicity and/ormutagenicity/carcinogenicity Although these amines are generallynotfurtherdegradedanaerobically,theirpotentialforaerobicbiodegradation has been demonstrated for simple molecular structures
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