Waste Water Story

Waste water released by houses is called sewage.

3 per cent.

It can include human waste, food scraps and chemicals.

Population growth.

22 March

Cleaning of water is the process of removing pollutants before it enters a water body or is reused.

Boiled

Drinking contaminated water results in diseases such as cholera, typhoid and diarrhoea. Polluted water can also prove fatal.

All of the above.

Pollutants in waste water can be removed in several stages, and this process is called “sewage treatment.

Inorganic

True

True

Phosphorous

Water treatment.

To remove large impurities.

A clarifier is a tank with its central part inclined downwards so as to allow faeces to settle down. The inclined waste is then removed using a scraper.

bacteria and microbes

Chlorine tablets or ozone.

Sludge

Tealeaves, solid food remains, soft toys, cotton, and sanitary towels.

Used tea leaves, solid food remains etc. should not be thrown down the drain as they may choke the drain.

The bar screen remove the large objects like rags, sticks, cans, plastics packets etc. from the sewage.

Waste water is passed through bar screens to remove big objects like cans, sticks, rags etc.

A skimmer removes the floatable solids like oil, grease etc.

Air is pumped into clarified water to help aerobic bacteria to grow.

Bottom and top.

Water is used for:

• Drinking
• Cooking
• Washing clothes, utensils
• Generating electricity
• Bathing

lack of knowledge and of money, illiteracy, large population and lack of social awareness results in improper sanitation

True

False

Chemical toilets

True

Sedimentation