Introduction
- We use water for our daily activities and make it dirty.
- Wastewater is the dirty water that goes down the drains from sinks, toilets, and laundries which is rich in lather, and mixed with oils.
- We can reuse this dirty water by removing pollutants from it.
- Demand for water is increasing day by day as the population is increasing. Many of people from some areas do not get enough water for their day-to-day activities.
- The increasing population is a great concern for the decline of the water table.
- In some places, people have to wall several kilometres for fresh water.
- Industrial and agricultural activities and scanty rain cause the scarcity of fresh water.
class 7 Chapter 18 wastewater story
https://www.youtube.com/watch?v=DOIjd6y74lo&list=PLAVY2tu_2M4gClIbolLst0U_2naPW71-k&index=5