The textile dyeing and printing industry have been recognized as
one of the most polluting industries in China, which contribute
towards the pollution of the water environment. Textile dyeing and
printing industries are one of the most highly polluting
industries. Effluent contain high COD, colour and substances that
are not biodegradable or nearly not, such as dyes, slurry,
additives, oil finishes, acids and bases, fiber impurities as well
as inorganic salts.
At present, common dyeing sewage treatment processes in China
generally adopt the physicochemical and biochemical (or
flocculation--biochemistry--absorption) technological routine that
include activated sludge biological treatment, physical and
chemical treatment, membrane treatment and so on.
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