How do 'bar screen' and 'grit and sand removal tank' help in clarification of water?

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Solution

When wastewater is passed through a bar screen it separates big and large objects like plastics, bags, sticks, cans, napkins, etc.
In the grit and sand removal tank, other solid impurities like pebbles, sand, etc. are removed.
The water is then allowed to settle in a tank, where particulates such as faeces (known as sludge) settle at the bottom and are scraped away using a scraper.

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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 part of the wastewater treatment plant are oil and grease removed from water?

(a) grit chamber
(b) clarifier
(c) aeration tank
(d) vertical bars

Q. In the aeration tank of a wastewater treatment plant, aerobic bacteria help in getting rid of some contaminants. Name some of these contaminants. How do the bacteria help to remove these contaminants?

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?

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

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