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The bioadsorption of dye from dyebath wastewater by chitosan-ZnO composite and the performance of composite treated wastewater in cotton fabric processing have been investigated. The detailed study has demonstrated that composite can effectively adsorb the colouring substances and organic pollutants from dyebath wastewater with the help of effective coagulant doses. From the result obtained, the optimum removal of dye was achieved at pH 7 with 0.8% of composite dosage and 120 minutes of mixing time at a temperature 70˚C. Under this condition, about almost 90 % of dye was successfully removed. The treated wastewater was found to be reusable in textile wet processing purposes. Cotton fabric processed with composite treated wastewater exhibited a quite satisfactory performance without any significant differences. Thus the findings of the project will open up the scope for reusing dyebath wastewater which can save million litres of fresh water per day for the processing of several thousand kg of textile materials in a single dyeing industry of pernicious organic matter and colouring substances.islamic general knowledge
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