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प्रश्न
Name two alternative arrangements for sewage disposal where there is no sewerage system.
उत्तर
Two alternative arrangements for sewage disposal where there is no sewerage system are:
- Septic tanks: In the septic tank, the sewage is allowed to flow into a tank in which anaerobic bacteria decompose the waste. The septic tank acts as sedimentation-cum-digestion tank. Anaerobic (in the absence of air) digestion of the settled sludge occurs in its bottom zone, and the remaining liquid has to undergo treatment in a soak pit/filter bed. This can be done in areas where the water table is very low and the rainwater from the surface also does not interfere with their functioning. Septic tanks are suitable for places where there is no sewerage system, for hospitals, isolated buildings or a cluster of 4 to 5 houses.
- Composting toilets: The composting toilet is a dry toilet that uses a predominantly aerobic processing system that treats excreta, typically with no water or small volumes of flush water, by aerobic decomposition.
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संबंधित प्रश्न
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
1. Used water
2. A pipe carrying sewage
5. Micro-organism which causes cholera
7. A chemical to disinfect water
What are the environmental effect caused by sewage?
Name two inorganic impurities present in sewage
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?
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.
