To remove sand and grit from sewage, it is passed into large tanks where the water slows down. Why is it required to slow water down?

Slowing down water allows bacteria to break down sand easily

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Slowing down water allows the sand and grit to settle down

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Slowing water down allows sand and grit to mix properly

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Slowing down water helps in filtration

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Solution

The correct option is B
Slowing down water allows the sand and grit to settle down

Slowing down water allows heavy particles of sand and grit to settle at the bottom naturally by gravity. This can then be removed in the process called desilting.

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Similar questions

Once wastewater is slowed down, it is let into large settlement tanks. Which of the following contaminants are removed as sludge in this process? (You may choose more than one option).

Q. From which one of these does sewage pass through to remove larger impurities?

(a) Vertical bars
(b) Grit chamber
(c) Aeration tanks
(d) Sedimentation tanks

A car approaching a school zone slows down from $27 m / s$ to $9 m / s$ with constant acceleration $- 2 m / s^{2}$ . How much time is required to slow down to final velocity?

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.

Q. In which one of these is air blown onto the sewage?

(a) Grit chamber
(b) Aeration tanks
(c) Water tank
(d) Septic tank

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To remove sand and grit from sewage, it is passed into large tanks where the water slows down. Why is it required to slow water down?

The correct option is B Slowing down water allows the sand and grit to settle down Slowing down water allows heavy particles of sand and grit to settle at the bottom naturally by gravity. This can then be removed in the process called desilting.

The correct option is B
Slowing down water allows the sand and grit to settle down

Slowing down water allows heavy particles of sand and grit to settle at the bottom naturally by gravity. This can then be removed in the process called desilting.