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Question
Given below is a jumbled sequence of the processes involved in a wastewater treatment plant. Arrange them in their correct sequence.
- Sludge is scraped out and skimmer removes the floating grease.
- Water is made to settle in a large tank with a slope in the middle.
- Large objects like plastic bags are removed by passing wastewater through bar screens.
- Sand, grit and pebbles are made to settle by decreasing the speed of incoming wastewater.
- Wastewater enters a grit and sand removal tank.
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Solution
The correct sequence of processes involved in a wastewater treatment plant is as follows:
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.
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