Most important pollutant in
effluent from food processing, cosmetics, paper, dye manufacturing, printing
and textile are colour left by dyes. In the middle of these, textile industries
consume large volumes of water and chemicals for wet processing of textiles.
The waste from the dying
operations in the textile industries may contain dyes of various intense
colours, such as dyes
having the functional groups of alkene, aromatic, C-N bond, S-O bond of red
colour. Some are made by inorganic molecules such as Al-O, Si-O, K-O, N=N bond
which responsible for colour development in the effluent. The conventional
effluent treatment systems are unable to remove recalcitrant dyes from the
effluents.
The removal of dyes from
effluents by the physico -chemical means such as membrane filtration advance
oxidation, photo catalysis, coagulation and adsorption are often very costly
and accumulation of concentrated sludge creates a disposal problem.
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