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Question
The terms sewage, sewers and sewerage are interlinked with each other. Can you explain, how?
Solution
Sewage is wastewater that flows down the drains of houses, industries, hospitals, offices, fields, etc. Rainwater that runs down the streets during storms or heavy rain also adds to the sewage. This is because rainwater falls on rooftops and roads and carries harmful substances with it. The dissolved and suspended solid impurities present in sewage are called contaminants. They include organic and inorganic impurities, nutrients and disease-causing bacteria and other microbes. Sewage goes through a system of pipes, called sewers. A sewer is an underground pipe for carrying off drainage water and waste matter. Sewers are linked to each other to form a network called a sewerage system.
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RELATED QUESTIONS
Wastewater released by houses is called ______.
Explain why it is harmful to discharge untreated sewage into rivers or seas.
Here is a crossword puzzle: Good luck!
Across
3. Liquid waste products
4. Solid waste extracted in sewage treatment
6. A word related to hygiene
8. Waste matter discharged from human body
Down
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Name two inorganic impurities present in sewage
Name two alternative arrangements for sewage disposal where there is no sewerage system.
What are the different types of inorganic and organic impurities generally present in sewage?
What is sewage?
Then and now: Talk to your grandparents and other elderly people in the neighbourhood. Find out the sewage disposal systems available to them. You can also write letters to people living in far off places to get more information. Prepare a brief report on the information you collected.
Visit a sewage treatment plant.
It could be as exciting and enriching as a visit to a zoo, a museum, or a park. To guide your observation here are a few suggestions.
Record in your notepad:
Place ______ Date ______ Time ______
Name of the official at the plant ______ Guide/Teacher ______
- The location of the sewage plant.
- Treatment capacity.
- The purpose of screening as the initial process.
- How is air bubbled through the aeration tank?
- How safe is the water at the end of the treatment? How is it tested?
- Where is the water discharged after treatment?
- What happens to the plant during heavy rains?
- Is biogas consumed within the plant or sold to other consumers?
- What happens to the treated sludge?
- Is there any special effort to protect nearby houses from the plant?
- Other observations.
