The textile dyeing and finishing sector uses
large volumes of water and substantial
quantities of complex chemicals.
Significant challenges associated with the
acquisition and disposal of the raw materials.
The charges incurred for mains water supply
and effluent disposal are increasing, and
companies need to address these issues to
save money and remain competitive.
Oxidation techniques: the treatment of synthetic dye
house effluent by ozonization, and hydrogen peroxide in
combination with Ultraviolet light; Sodium hypochlorite
Electrolytic precipitation & Foam fractionation:
reduction in the cathode space of an electrolytic bath;
surface-active solutes collect at gas-liquid interfaces
Photo catalytic degradation: photoactive catalyst
illuminates with UV light, generates highly reactive
radical, which can decompose organic compounds.
Thermal evaporation: Use of sodium per sulphate;
oxidative decolourisation of reactive dye by persulphate
due to the formation of free radicals
Ozonation- used for oxidation of organics and
inorganic, deodorization, and decolourisation
Nanofilteration and Ultrafilteration-
difference between reverse osmosis and
ultrafiltration/nanofilteration is primarily the retention
properties of the membranes
Crystallization- formation of solid crystals from a
homogeneous solution; used to recover salts.
Multiple Effect Evaporation- vertical cell in
which stainless steel tube is mounted; evaporator systems
works on falling liquid film theory.