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Azo dyes are often found in the environment as a result of their wide industrial uses.
These industrial pollutants are common contaminants in wastewater and are difficult to
decolourise due to their complex aromatic structure and synthetic origin.
During the past three decades, several wastewater treatment methods have been reported
and attempt for the removal of dyes from the textile effluents.
This study is focused on the removal Acid Blue 92 (AB92), which is principally used in
the textile industry. For this removal, it was applied two different techniques: the biosorption
and the coagulation – flocculation.
As biosorbent, chitosan was used due to its low cost, its wide intrinsic properties and its
The first part of this work consisted of the study of the equilibrium conditions and the
sorption kinetics of AB92 on chitosan. The effect of parameters such as the initial dye
concentration, pH, sorbent dosage, etc. was also discussed. On the other hand, it carried out the
coagulation – flocculation studies taking into account the critical parameters. Finally, several
experiments were realized in order to know the influence of salts present in the effluents.
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