Question

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

Answer 1

(c) Large objects like plastic bags ​are removed by passing wastewater ​through bar screens.​

(e) Wastewater enters a grit and ​sand removal tank​

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

(b) Water is made to settle in a ​large tank with a slope in the ​middle. ​

(a) Sludge is scraped out and ​skimmer removes the floating grease.