Given below is a jumbled sequence of the processes involved in a wastewater treatment plant. Arrange them in their correct sequence. ​

1. Sludge is scraped out and skimmer removes the floating grease. ​

2. Water is made to settle in a large tank with a slope in the middle. ​

3. Large objects like plastic bags are removed by passing wastewater through bar screens. ​

4. Sand, grit and pebbles are made to settle by decreasing the speed of incoming wastewater. ​

5. Wastewater enters a grit and sand removal tank

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 process of removing large objects such as plastic bags, clothes, diapers etc using grills and nets in a wastewater treatment plant is called________.

Why is wastewater passed through bar screens in a wastewater treatment plant?