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The purpose of biological treatment of w...

The purpose of biological treatment of waste water is to

A

reduce BOD

B

increase BOD

C

reduce sedimentation

D

increase sedimentation

Text Solution

Verified by Experts

The correct Answer is:
A
Secondary treatment of sewage (or biological treatment) deplets `90- 95%` of the `BOD` and may pathogens are removed. Reduction of `BOD` by `90%` is achieved through mineralisation of small fraction of organic matter and convertion of large proportion to removable solids.
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NCERT FINGERTIPS-MICROBES IN HUMAN WELFARE-Microbes In Human Welfare
  1. is the first step of sewage treatment.

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  2. During the primary treatment of sewage, solid paricles that settle dow...

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  3. The purpose of biological treatment of waste water is to

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  4. The masses of bacteria held together by slime and fungal filaments to ...

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  5. Read the following statements and select the correct option. Statem...

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  6. BOD isin polluted water and in potable water.

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  7. Biochemical oxygeb demand (BOD) in a river water

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  8. When domestic sewage mixes with river water

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  9. A sewage treatement process in which a part of decomposer bacteria pre...

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  10. In the sewage treatment, bacterial flocs are allowed to sediment in a ...

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  11. Mach column I with column II and select the correct answer from the gi...

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  12. Given below is the flow chart of sewage treatement. Identify A,B,C and...

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  13. Read the following statements and select the incorrect one.

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  14. Select the correct statement regarding activated sludge formed during ...

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  15. Which of the following steps is taken by the Ministry of Enviornment a...

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  16. Mach column I with column II and select the correct answer from the gi...

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  17. Study the following statements and select the incorrect ones. (i) Ph...

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  18. Methanogens, growing anaerobically on cellulosic material produce

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  19. Which of the following bacteris is present in the rumen of cattle?

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  20. Process of biogas production is

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