Waste Water Story - Chapter Wise CBSE Solved Question and Answer Based On NCERT
Points To Remember:
Water should be filtered before it is used for drinking, as it contains many impurities that cannot be easily seen with the naked eye. In order to have safe drinking water, it should be boiled.
Water gets contaminated by humans and it is not safe for drinking.
Drinking contaminated water results in diseases such as cholera, typhoid and diarrhoea. Polluted water can also prove fatal.
Water has become so scarce that many people have to travel several kilometres to get drinking water.
March 22nd is celebrated as World Water Day.
Pollutants in waste water can be removed in several stages, and this process is called “sewage treatment”.
This sewage is liquid waste containing dissolved impurities, and the impurities are calledcontaminants, which contain many harmful substances.
Waste water needs to be treated before it can bereused, or released into a water body. Wastewater has many impurities and these impurities should be removed by water treatment.
