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 the 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

Wastewater treatment:

1. Wastewater treatment is done to remove contaminants and make it an effluent.
2. It removes suspended solids before the effluent is released back into the environment.

The correct sequence of wastewater treatment is:

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 the skimmer removes the floating grease.