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Which of the following statements about ...

Which of the following statements about sewage treatment is false?

A

In primary treatment, large sized particles are filtered through screens and residual water is subjected to sedimentation

B

Secondary treatment involves aerobic digestion of the organic waste

C

In tertiary treatment, the waste water is treated with lime to remove phosphate followed by coagulation

D

Coagulation can be carried out by passing ozone through waste water

Text Solution

Verified by Experts

The correct Answer is:
D
Coagulation can be carried out by adding alum and ferric chloride in waste water.
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BRILLIANT PUBLICATION-ENVIRONMENTAL CHEMISTRY-QUESTIONS LEVEL-II
  1. Which of the following statements is wrong?

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  2. Which of the following practices will not come under green chemistry?

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  3. Which of the following statements about sewage treatment is false?

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  4. When rain is accompanied by a thunderstorm, the collected rain water w...

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  5. Which of the following statements is false?

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  6. Peeling of ozone umbrella, which protects us from UV rays is caused by

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  7. Loam soil contains almost equal amounts of

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  8. Incomplete combustion of petrol or diesel in automobile engines can be...

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  9. Which of the following causes damage to the building containing calciu...

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  10. Persons working in cement plants and limestone quarries are more prone...

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  11. Main pollutants released from iron and steel industry is

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  12. Which is incorrectly matched?

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  13. Man dies in the atmosphere of CO because it

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  14. Which pollutant causes burning sensation of throat and eyes and vomiti...

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  15. In which one of the following the biochemical oxygen demand (BOD) of s...

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  16. Which one is not a correct statement? To minimise pollution:

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  17. If BOD of a river is high, it means that the river is

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  18. Photo-chemical oxidants such as PAN or PBN are formed:

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  19. Lung diseases are four times more in urban areas than rural areas. Thi...

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  20. Which one of is not correct? Green house effect

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