Class 7th Science NCERT Chapter 18
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Topics to study from the chapter "Wastewater Story" along with 1-2 lined summaries for each:
1. Water, Our Lifeline:
– Clean water is essential, but not universally accessible, leading to water-related diseases. Efforts like the International Decade for action on "Water for life" aim to enhance access to safe drinking water.
2. What is Sewage?:
– Sewage comprises wastewater from various sources, including harmful substances. It consists of suspended solids, organic and inorganic impurities, nutrients, and disease-causing bacteria like cholera and typhoid.
3. Water Freshens Up — An Eventful Journey:
– Sewerage systems transport sewage to treatment plants, where pollutants are removed. The chapter explains the network of pipes, manholes, and the disposal of sewage.
4. Wastewater Treatment Plant (WWTP):
– Wastewater treatment involves physical, chemical, and biological processes to remove contaminants. Steps include bar screens to remove large objects, grit and sand removal, settling of solids, and the use of activated sludge for treatment. The treated water is discharged after removing organic material and suspended matter.
What is wastewater and why should it not be wasted?
Why is clean water considered a basic need for human beings? Explain the significance.
Describe what sewage consists of and mention its sources.
Explain the sewage treatment process in brief. What is the common name for this process?
Outline the main processes involved in a wastewater treatment plant according to the chapter.
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