L textile industry
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Transcript of L textile industry
L-27Textile IndustryTextile Industry
Industrial Waste Treatment
Introduction
Textile mill uses cotton, wool or synthetic fibers.Waste water generated depends upon Waste water generated depends upon type of fiber used.The pollutants in the wastewater include
- The fibers used and - Chemicals used in processing
Cotton Textile mill
An integrated textile mill produces it yarn from raw cotton.Production of yarn from raw cotton includes steps such as
- Opening and cleaning- Opening and cleaning- Picking- Carding- Drawing- Spinning- Winding and wrapping
All these are dry operations and
does not produce any liquid waste
The entire waste is generated from following operations
- Slashing- Scouring All these are wet - Scouring- Desizing- Bleaching- Mercerizing- Dyeing and finishing
All these are wet operations and produce liquid waste having
varying properties
Yarn manufacturing
RAW
Carding and combing
Wet processes
Wet Process in textile mill Chemicals used
Scouring and Desizing(50% of total pollutional load)
Enzymes, caustic soda, soda ash and detergents
Bleaching (10 % load) Peroxides and hypo chlorides
Mercerizing (small quantity Caustic soda Mercerizing (small quantity of waste)
Caustic soda
Dyeing Variety of dyes (reactive,vat, sulfur, basic etc), caustic soda etc
finishing Starches, dextrines and synthetic waxes, resins etc
Composition of composite cotton textile mill waste
Your Subtopics Go HereCharacteristics Value
pH 9.8 - 11.8
Total alkalinity 17.35 mg/lit as CaCO3
BOD 760 mg/lit
COD 1418 mg/lit
Total Solids 6170 mg/lit
Total Chromium 12.5 mg/lit
Treatment alternative
Treatment alternative
Oxidation Pond
Objective Questions
1. For treatment of textile waste, neutralization tank is needed because of __________nature of wastewater.
2. pH of textile mill waste is in the range of 2. pH of textile mill waste is in the range of ____.
3. Pick out odd one w r t textile millDesizing, quilling, dyeing, proportioning
Theory Questions
Q1. Draw a manufacturing process flow sheet for textile industry. Also mention sources of wastes.
Q2. Give general characteristics of textile Q2. Give general characteristics of textile mill waste.
Q3. Discuss treatment alternatives for textile mill waste.