Page 157 - Arrow Publications Pvt. Ltd.

Water purification is the process of removing all kinds of dust particles and

contaminants from water that are bad for our health, like bacteria, viruses, and

other dangerous chemicals.

Water must first be purified before it can be used. Water treatment plants

receive their water through channels from rivers and lakes. This water is treated

with chemicals to purify it.

Think &
Answer Sometimes we get dirty and muddy water from the taps at home. Why is the water
getting dirty? How do you use this water?

Water is usually purified by adding chlorine gas to it. Chlorination is the

process of adding chlorine to water to destroy viruses and harmful microbes.

We can also add bleaching powder and potassium permanent to kill germs in
water. Purified water is sent to different places through pipes.

We purify water at home by boiling or filtering it. Boiling

water kills the germs in it and makes it drinkable. Boiling

water for more than 20 minutes and then filtering it will
eliminate any microbes that may be present.

Find It What is the difference between filtered water and boiled water? Boiling water to remove
Out impurities

We also filter water to remove dirt, bacteria and viruses from it. Filtration is

the process of removing impurities from water. We use different

types of water filters at home. These days many filters and R.O.

(Reverse Osmosis) water purifiers are available in the market

that kill microbes and make the water safe for drinking.

Water-borne diseases

Water-borne diseases are caused by drinking dirty water.

Water is contaminated by disease-causing germs or microbes.

These microbes can be carried by humans, animals, or even
insects and spread to other people.

156
156 | Arrow - EVS Plus-4