Q. 53.6( 46 Votes )
What is sludge? Explain how it is treated?
Semi-solid wastes like feces that settle down at the bottom during wastewater treatment are called sludge.
The sludge is removed using a scrapper and then transferred to a separate tank where it is decomposed by the anaerobic bacteria to produce biogas.
This biogas is used as fuel for cooking, heating, etc.
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Study the following statements about ozone:
(a) It is essential for breathing of living organisms.
(b) It is used to disinfect water.
(c) It absorbs ultraviolet rays.
(d) Its proportion in air is about 3%.
Which of these statements are correct?
(i) (a), (b) and (c)
(ii) (b) and (c)
(iii) (a) and (d)
(iv) All four
Here is a crossword puzzle: Good luck!
3. Liquid waste products
4. Solid waste extracted in sewage treatment
6. A word related to hygiene
8. Waste matter discharged from human body
1. Used water
2. A pipe carrying sewage
5. Micro-organisms which causes cholera
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Three statements are provided here which define the terms –
(a) sludge (b) sewage and (c) wastewater. Pick out the correct definition for each of these terms.
(a) The settled solids that are removed in wastewater treatment with a scraper.
(b) Water from kitchen used for washing dishes.
(c) Wastewater released from homes, industries, hospitals and other public buildings.NCERT - Exemplar Science