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.

The settled solids that are removed in wastewater treatment with a scraper.

Water from kitchen used for washing dishes.

Wastewater released from homes, industries, hospitals and other public buildings.

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Solution

The settled solids that are removed in wastewater treatment with a scraper - (a) sludge

Water from kitchen used for washing dishes - (c) wastewater

Wastewater released from homes, industries, hospitals and other public buildings - (b) sewage

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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.

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

Question 20

Given below is a jumbled sequence of the processes involved in a wastewater treatment plant. Arrange them in their correct sequence.
(a) Sludge is scraped out and skimmer removes floating grease.
(b) Water is made to settle in a large tank with a slope in the middle.
(c) Large objects like plastic bags are removed by passing wastewater through bar screens.
(d) Sand, grit and pebbles are made to settle by decreasing the speed of incoming wastewater.
(e) Wastewater enters a grit and sand removal tank.

The system of a network of pipes used for taking away wastewater from homes or public buildings to the treatment plant is known as

Q. Which of the following is removed using a scraper during wastewater treatment?

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Secondary Treatment

Standard VII Chemistry

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The settled solids that are removed in wastewater treatment with a scraper - (a) sludge ​ Water from kitchen used for washing dishes - (c) wastewater​ Wastewater released from homes, industries, hospitals and other public buildings - (b) sewage

The settled solids that are removed in wastewater treatment with a scraper - (a) sludge

Water from kitchen used for washing dishes - (c) wastewater

Wastewater released from homes, industries, hospitals and other public buildings - (b) sewage