Thermal Pollution
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Transcript of Thermal Pollution
THERMAL POLLUTION
SRIRAM V
LECTURER IN CHEMISTRY KNCET
THOTTIAM
THERMAL POLLUTION
DEFINITION ADDITION OF EXCESS OF
UNDESIRABLE HEAT TO WATER THAT MAKES IT HARMFUL TO MAN, ANIMAL OR AQUATIC LIFE
CAUSES
DISCHARGE OF HEATED WATER OR HOT WASTE MATERIAL INTO WATER BODIES FROM
NUCLEAR POWER PLANTS INDUSTRIAL EFFLUENTS DOMESTIC SEWAGE HYDRO-ELECTRIC POWER COAL FIRED POWER PLANTS
NUCLEAR POWER PLANTS Nuclear power plants use water as a cooling agent.
After the water is used, it is put back into a water supply at 9-20oC
Emissions from nuclear reactor increase the temperature of water bodies.
Coal-fired power plants Coal is utilized as a fuel Condenser coils are cooled with water from nearby lake or river The heated effluents decrease the DO of water Damages the marine organisms
Industrial Effluents
Discharged water from steam-electric power industry
using turbo generators will have a higher temperature
ranging from 6 to 9˚C than the receiving water
In modern stations, producing 100 MW, nearly one
million gallons are discharged in an hour with increase
in temperature of the cooling water passing by 8 to 10 ˚C
Domestic sewageSewage is commonly discharged into lakes,
canals or streams
Municipal sewage normally has a higher
temperature than the receiving water
Increase in temperature of the receiving
water decreases the DO of water.
The foul smelling gases increased in water
resulting in death of marine organisms
Hydro electric power generationGeneration of hydroelectric power sometimes results in
negative thermal loading in water systems
Creates less heat on water sources less than nuclear
power plant
CONTROL MEASURES
Cooling towers
Cooling ponds
Spray ponds
Artificial lakes