Wastewater Story. Science CBSE, Class 7: lessons, tests, tasks.

1.	Water as our lifeline and wastewater
2.	Sewage, sewers and sewerage
3.	Wastewater treatment plant: Physical and biological processes involved
4.	Wastewater treatment plant: Chemical process
5.	The need for us to become an active citizen
6.	Housekeeping practices that are to be adopted
7.	Importance of sanitation and cause of diseases
8.	Alternative methods of disposing sewage

Methodical recommendation

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Wastewater Story