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Question
What is sewage?
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Solution 1
Sewage is liquid waste. It consists of wastewater from houses, offices, factories, hospitals, etc. It is a complex mixture containing suspended solids, organic and inorganic impurities, nutrients, saprotrophic and disease-causing bacteria, and other microbes.
Solution 2
Sewage is a collective term for municipal wastewater, which includes both liquid and solid wastes produced in cities and towns and transported via sewers. Chemically, sewage consists of approximately 99% water and 1% solid waste, which may be organic or inorganic in nature. Sewage typically contains bacteria (e.g., coliforms, streptococci, clostridia, lactobacilli), microfungi, protozoa and microalgae.
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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
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6. A word related to hygiene
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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?
The terms sewage, sewers and sewerage are interlinked with each other. Can you explain, how?
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.
