What is sludge? Choose the correct option.

Semisolids that settle down during wastewater treatment.

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Industrial waste that is released in the rivers.

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Human excreta which mixes with water.

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Clay mixed with water that is used by the potter to make earthen pots.

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Solution

The correct option is A Semisolids that settle down during wastewater treatment.
Semi-solids such as faeces that settle down during wastewater treatment are called sludge. This sludge is removed using a skimmer and then transferred to a tank where it is decomposed by anaerobic bacteria to produce biogas. This biogas is used as a low-cost fuel for heating, cooking, etc. It is also used to produce electricity.

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Similar questions

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.

Q. 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

Q. The release of municipal wastewater and industrial waste into our natural water bodies is causing disastrous effect to the aquatic life. Explain the biological treatment that should be given to it before releasing into the natural water bodies. [3 marks]

Q. Rich in lather, mixed with oil, black-brown water that goes down the drains from ________ is dirty. It is called waste water.

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

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