Muhammad Fahad Ansari 12IEEM14

2. PRESENTED BY
MUHAMMAD FAHAD ANSARI
12 IEEM 14

3. WHAT IS AIR POLLUTION ?
 Air pollution is the introduction of
chemicals, particulate, or biological material that cause
harm or discomfort to humans or other living
organisms, or damages the natural environment into the
atmosphere.

4. AIR POLLUTION IN DIFFERENT
PROCESSES OF TEXTILE
PROCESS SOURCE POLLUTANT
Energy Production Emissions from boiler Nitrous oxides (Nox) ,sulphur
dioxide (SO2)
drying and curing Emission from high temperature Volatile organic components
ovens (VOCs)
Cotton handling activities Emissions from preparation, carding, Particulates
combing, and fabrics manufacturing
Sizing Emission from using sizing Nitrogen oxides, sulphur oxide,
compound (gums, PVA) carbon monoxide.
Bleaching Emission from using chlorine Chlorine, chlorine dioxide
compound

5. PROCESS SOURCE POLLUTANT
Dyeing Disperse dyeing using carriers Carriers
Sulphur dyeing
H2S
Printing Screen printing ,rotary printing Hydrocarbons, ammonia
Finishing Resin finishing Heat setting of Formaldehyde
synthetic fabrics
Carriers - low molecular weight
Polymers - lubricating oils
Chemical storage Emissions from storage tanks forVolatile organic components
commodity and chemicals (VOCs)
Waste water treatment Emissions from treatment tanks andVolatile organic components,
vessels toxic emissions

6. Effect Of Dust
 Formation of dust film on every surface
 Particles fall into moving parts of machinery
 Dirty appearance of product
Effect of Dust - Health Hazards
 Cotton dust – biossinosis (lung disease)
 Asbestos dust – lung cancer
 Wool dust – allergic, sneezing attacks, asthma and
related diseases

7. Pollution Control
Spinning mill
 Maintaining m/c parts
 Maintaining hardness of rubber cots
 Maintaining RH%
 Using overhead pneumatic cleaners
 Cyclone filters, Cloth filters
Wet processing unit
 Electrostatic precipitator
 scrubber
 oxidizer

8. SCRUBBERS
 The Scrubber is one of the most common pollution
control device used by industries.
 There are two types of Scrubbers: Wet Scrubbers and
Dry Scrubbers. Mechanism of both the scrubbers is
almost same.
 The only difference is in case of Dry Scrubbers End
Product is in solid form while in case of Wet Scrubbers
it is found in liquid form.

9. DRY SCRUBBERS/CYCLONIC SCRUBBERS
•This is a chamber having a plate at the
center which is kept moist by water
injected through the nozzles.
•The dust laden gas is forced in the
chamber with a centrifugal motion as
shown in the figure. The aerosol and
particulate matters are arrested by the
moist plate.
•The clean gas is allowed to pass
through the outlet pipe.

10.  The moisture of the plate is then eliminated by some
suitable device and the aerosol and the particulate
matters are collected at the bottom and are removed
through the outlet pipe

11. WET SCRUBBERS/Venturi Scrubbers
•In this device, a venturi meter is
fitted at the bottom of a cylindrical
vessel.
•The dust laden gas and water are
allowed to enter the venturi meter
from the top.
•The gas comes in contact with
water at the throat. The descending
water absorbs the aerosol and
particulate on its way

12.  Thus the dirty droplets are formed which are
collected in the collection chamber. The clean gas
rises up and finally it is released in the atmosphere
through the outlet.