thermal pollution

12
THERMAL POLLUTION SRIRAM V LECTURER IN CHEMISTRY KNCET THOTTIAM

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thermal pollution

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Page 1: Thermal Pollution

THERMAL POLLUTION

SRIRAM V

LECTURER IN CHEMISTRY KNCET

THOTTIAM

Page 2: Thermal Pollution

THERMAL POLLUTION

Page 3: Thermal Pollution

DEFINITION ADDITION OF EXCESS OF

UNDESIRABLE HEAT TO WATER THAT MAKES IT HARMFUL TO MAN, ANIMAL OR AQUATIC LIFE

Page 4: Thermal Pollution
Page 5: Thermal Pollution

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

Page 6: Thermal Pollution

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.

Page 7: Thermal Pollution

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

Page 8: Thermal Pollution

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

Page 9: Thermal Pollution

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

Page 10: Thermal Pollution

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

Page 11: Thermal Pollution
Page 12: Thermal Pollution

CONTROL MEASURES

Cooling towers

Cooling ponds

Spray ponds

Artificial lakes