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Effect of Sewage on Water Bodies

The light mat...

Question

The light materials which float during waste water treatment is
(a) sludge
(b) scum
(c) biogas
(d) sewer

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Solution

(b) scum
The light material that floats during waste water treatment is known as scum.

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Question 3

Which of the following is/are products of wastewater treatment?
(a) Biogas
(b) Sludge
(c) Both biogas and sludge
(d) Aerator

Q. Waste water that flows out from our homes is called ________________.
(a) garbage
(b) sludge
(c) sewage sewer
(d) sewer

Q. How many of the following statements are correct with respect to the activated sludge?

I - It is composed of soil and small pebbles that are removed during the primary treatment of the sewage
II - It can be used for biogas production
III - It is fed into anaerobic sludge digesters
IV - It is obtained at the end of the oxidation of organic wastes during the secondary treatment of the sewage

Q. Waste water treatment generates a large amount of sludge, which can be treated by

Q. The waste sludge formed in biogas plants can be used as a biofertilizer.

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Effect of Sewage on Water Bodies

Standard VII Biology

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