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12. 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

(ii) (b) and (c) are correct.

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Posted by

Sayak

11. 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. The waste matter discharged from the human body
Down
    1. Used water
    2. A pipe carrying sewage
    5. Micro-organisms which causes cholera
    7. A chemical to disinfect water

Across
    3. SEWAGE
    4. SLUDGE
    6. SANITATION
    8. EXCRETA
Down
    1. WASTEWATER
    2. SEWER
    5. BACTERIA
    7. OZONE

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Posted by

Sayak

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10. Outline your role as an active citizen in relation to sanitation.

As an active citizen, we should ensure that proper sanitation facilities are available in our home and workplaces, should make people aware about the necessity of sanitation and should not throw garbage in the open as it will block the drains and restrict the flow of the sewage.

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Posted by

Sayak

9. Explain the relationship between sanitation and disease.

Explain the relationship between sanitation and disease

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Posted by

vasavi

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8. Explain the function of bar screens in a wastewater treatment plant.

Bar screens filter most of the large-sized solid waste like plastic, cans, wood etc from wastewater.

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Posted by

Sayak

7. Name two chemicals used to disinfect water.

Two chemicals used to disinfect water are Chlorine and Ozone.

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Posted by

Sayak

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6. Untreated human excreta is a health hazard. Explain.

Untreated human excreta is harmful for us by these ways:-

  1. It causes soil pollution,air pollution and water pollution.
  2. It causes disease like cholera, meningitis etc.
  3. It harm decomposers.

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Posted by

shresth kumar

5. What is sludge? Explain how it is treated.

Sludge is the solid waste which has settled at the bottom of settling tanks during the process of wastewater treatment.

It is treated by decomposition by anaerobic bacteria. This activated sludge further can be used as manure.

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Posted by

Sayak

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4. Describe the steps involved in getting clarified water from wastewater.

The treatment of wastewater includes the following steps:

(i) First, the physical waste like plastic, rags, pebbles, wood etc is removed by passing the water through a bar screen.

(ii) Then water is sent into sand removal tank for removing sand, pebbles, grit etc. through the process of sedimentation.

(iii) Then the rest of the solid waste is allowed to settle at the bottom of a large settling tank. This waste deposited at the bottom is called sludge and is removed through a scraper.

(iv) The harmful microorganisms in this water are killed through chlorination or UV rays.

(v) Through aerator, air is pumped into this water so that aerobic bacteria can grow and decompose any remaining organic wastes.

(vi) This treated water is then released into the water bodies.

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Posted by

Sayak

3. Why should oils and fats be not released in the drain? Explain.

Oils and fats are insoluble in water. When released in the drain, it causes hardening and blocking of the sewage pipes. In an open drain, the fats block the soil pores which is required for filtering water. That is why oil and fats should not be released in the drain.

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Posted by

HARSH KANKARIA

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