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TEXTILE INDUSTRY
TEXTILE INDUSTRY
ABHISHEK RAJPUT H.C.S.T. ,B.Tech (Env. Engg.)
INTRODUCTION 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.
For cotton textile industry
FOR WOOLEN TEXTILE INDUSTRY
POLLUTION PROBLEMS IN TEXTILE INDUSTRY
Color Dissolved solids Toxic metals Residual chlorine Others (like non-biodegradable
organics)
TEXTILE INDUSTRY WASTE WATER CHARACTERISTICS
TREATMENT OF WASTE WATER
Oxidation techniques: the treatment of synthetic dye house effluent by ozonization, and hydrogen peroxide in combination with Ultraviolet light; Sodium hypochlorite decolorizes dye
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
EFFLUENT CHARACTERISTICS AFTER TREATMENT
Parameters
Influent Primary treatment
Ozonation
RO Stage I RO Stage II
Permeate
Reject Permeate
Reject
pH 9.88 9.61 6.92 6.03 6.72 5.76 7.04
Total suspended solids, mg/l
167 56 19 6 70 6 124
Total dissolved solids, mg/l
3104 1946 3256 922 9830 196 17828
Chemical oxygen demand, mg/l
586 166 130 26 327 17 754
Biochemical oxygen demand, mg/l
190 41 41 1 16 2 208
Total Hardness, mg/l
96 60 Nil 1080
Chlorides, mg/l 334 636 692 314 108 34 4416
Colour, % purity <10 <10 Colorless Colorless <10 Colourless 10-20
INNOVATIVE TECHNOLOGY 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.
QUESTIONS PLEASE…