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Quick Revision: Wastewater story Video Lecture | Science Class 7 (Old NCERT)
FAQs on Quick Revision: Wastewater story Video Lecture - Science Class 7 (Old NCERT)
| 1. What is wastewater? |  |
Ans. Wastewater refers to water that has been used in households, businesses, industries, or agriculture and contains impurities or contaminants that need to be treated before being released back into the environment.
| 2. Why is it important to treat wastewater? | |
Ans. It is essential to treat wastewater to remove harmful pollutants and contaminants before it is discharged into water bodies to protect public health, the environment, and aquatic life.
| 3. How is wastewater treated? | |
Ans. Wastewater is treated through various processes such as screening, settling, biological treatment, filtration, and disinfection to remove solids, organic matter, and harmful substances before being discharged or reused.
| 4. What are the common methods of wastewater treatment? | |
Ans. The common methods of wastewater treatment include physical processes like sedimentation and filtration, biological processes like activated sludge and trickling filters, and chemical processes like disinfection using chlorine or UV light.
| 5. What are the environmental impacts of untreated wastewater? | |
Ans. Untreated wastewater can lead to water pollution, eutrophication, contamination of drinking water sources, and harm to aquatic ecosystems, posing serious threats to human health and the environment.
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Oct 05, 2025
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