Thermal pollution

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Presentation Description

It's about thermal pollution

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Presentation Transcript

Slide 1: 

Anand Raja Presents Seminar on

Slide 2: 

Thermal pollution

Slide 3: 

DEFINITION ADDITION OF EXCESS OF UNDESIRABLE HEAT TO WATER THAT MAKES IT HARMFUL TO MAN, ANIMAL OR AQUATIC LIFE

CAUSES : 

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

Slide 5: 

Suffocated fish Low dissolved oxygen Decreased fish population Altered food web Thermal Pollution

Nuclear 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 warmer

Slide 7: 

Red – reservoirs Yellow – Fossil Plants Purple – Nuclear Plants

Waste Heat from Power Plants : 

Waste Heat from Power Plants

Industrial Effluents : 

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 sewage : 

Domestic sewage Sewage 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 generation : 

Hydro electric power generation Generation of hydroelectric power sometimes results in negative thermal loading in water systems Creates less heat on water sources less than nuclear power plant

Coal-fired power plants : 

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

Effects of Increased Water Temperature : 

Effects of Increased Water Temperature Thermal shock – aquatic life adapted to a certain water temperature can go into shock when the temp is changed even 1 or 2 degrees. Oxygen dissolved in water decreases Increases the rate of photosynthesis, which increases the amount of plant growth Increases the metabolic rate of fish, which increases their need for oxygen

Dissolved Oxygen vs Temp : 

Dissolved Oxygen vs Temp

The Future is Now : 

The Future is Now

CONTROL MEASURES : 

CONTROL MEASURES Cooling towers Cooling ponds Spray ponds Artificial lakes

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