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Water Pollution

Presented By:

Dr. Md. Salequr Rahman

Dep. Of Community Medicine

Water is made of tiny molecules of hydrogen and oxygen.

Each one is so small that you can’t see it even with the most powerful microscope.

Pure water has no colour , no taste and doesn’t smell of anything.

Water exists in three forms on the Earth: > solid (ice, hail, snow or frost) > liquid (in lakes, oceans, rain, dew, fog or mist) > gas (steam or water vapour - "invisible" water in

the air).

What is water?

Any chemical, physical or biological change in the quality of water that has a harmful effect on any living thing that drinks or uses or lives (in) it.

When humans drink polluted water it often has serious effects on their health.

What Is Water Pollution?

• Surface Water Pollution• Ground Water• Microbiological• Chemical• Oxygen Depleting• Nutrients• Suspended Matter

Types of Water Pollution

MARINE DUMPING OIL POLLUTION GLOBAL WARMING RADIOACTIVE WASTE

Causes

Ways To Prevent Wisely observe which nutrients

are required on the yard before fertilizers are applied.

Wisely choose alternatives methods.

Do not throw rubbish in the sewage or any water passage.

Follow the law. Do not litter. Act smart.

Water Treatment

Conserve Water Run your clothes washer and dishwasher only

when they are full. You can save up to 1,000 gallons a month.

Monitor your water bill for unusually high use. Your bill and water meter are tools that can help you discover leaks.

Shorten your shower by a minute or two and you'll save up to 150 gallons per month.

Use sprinklers for large areas of grass. Water small patches by hand to avoid waste.

Collect water from your roof to water your garden.

Of all the water in the world, only 3% is fresh.

Less than one third of 1% of this fresh water is available for human use.

The rest is frozen in glaciers or polar ice caps, or is deep within the earth, beyond our reach.

To put it another way, if 100 liters represents the world's water, about half a tablespoon of it is fresh water available for our use.

Why should we save water?

Water Cycle

The water evaporates from the rivers, seas, lakes and forms clouds. When the temperature decreases the water vapor becomes liquid and rain occurs. Water returns to the surface.

The Water In Our Lives

Water is one of the most important nutrients. Our body is made up of at least 60% of water.