Study Materials

NCERT Solutions for Class 7th Science

 

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Chapter 18. Wastewater Story

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Chapter Review:


  • Cleaning of water is a process of removing pollutants before it enters a water body or is reused.This treatment is commonly known as “Sewage Treatment”.
  • Sewage is a liquid waste.Most of it is water, which has dissolved
    and suspended impurities.These impurities are called contaminants.
  • Full Form of (WWTP) is WASTEWATER TREATMENT PLANT.
  • Wastewater is generated in homes, industries, agricultural fields and in other human activities. This is called sewage.
  • A skimmer removes the floatable solids like oil and grease. Water so cleared is called clarified water.

 

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Chapter Contents: