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.
AIR POLLUTION IN DIFFERENTPROCESSES 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
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
Effect Of Dust Formation of dust film on every surface Particles fall into moving parts of machinery Dirty appearance of productEffect of Dust - Health Hazards Cotton dust – biossinosis (lung disease) Asbestos dust – lung cancer Wool dust – allergic, sneezing attacks, asthma and related diseases
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.
DRY SCRUBBERS/CYCLONIC SCRUBBERS•This is a chamber having a plate at thecenter which is kept moist by waterinjected through the nozzles.•The dust laden gas is forced in thechamber with a centrifugal motion asshown in the figure. The aerosol andparticulate matters are arrested by themoist plate.•The clean gas is allowed to passthrough the outlet pipe.
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
WET SCRUBBERS/Venturi Scrubbers•In this device, a venturi meter isfitted at the bottom of a cylindricalvessel.•The dust laden gas and water areallowed to enter the venturi meterfrom the top.•The gas comes in contact withwater at the throat. The descendingwater absorbs the aerosol andparticulate on its way
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.