Which one of these refers to the material that settles at the bottom in wastewater treatment?

(a) Sludge
(b) Scum
(c) Sewage
(d) None of these

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Solution

(a) Sludge
Sludge is the solid material that settles at the bottom in wastewater treatment.

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Question 21

Three statements are provided here which define the terms, i.e. sludge, sewage and 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.

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.

Question 3

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

Q. Write one word for each of the following.

1.	Dirty water	....................
2.	Impurities in wastewater	....................
3.	The chemical process of waste water treatment plant	....................
4.	Wastewater that contains suspended impurities	....................
5.	The material that settles at the bottom of sedimentation tanks	....................
6.	Material that rises to the top in sedimentation tanks	....................

Q. Sludge formation is a part of _______ process in the wastewater treatment plant.

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Which one of these refers to the material that settles at the bottom in wastewater treatment? (a) Sludge (b) Scum (c) Sewage (d) None of these

(a) Sludge Sludge is the solid material that settles at the bottom in wastewater treatment.

Which one of these refers to the material that settles at the bottom in wastewater treatment?

(a) Sludge
(b) Scum
(c) Sewage
(d) None of these

(a) Sludge
Sludge is the solid material that settles at the bottom in wastewater treatment.