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Differentiate the sentences:
Answer variants:
This water is then allowed to settle for several hours so that the waste materials settle down in the tank as activated sludge.
The dried sludge is used as manure so that the organic matter and nutrients are returned to the soil.
The skimmer removes certain other floatable substances such as the oil and grease, so that clarified water is obtained.
This sludge is separated from the water with the help of a Scrapper.
To remove the large objects like plastic bottles, napkins, rags, cans and sticks, the wastewater is first passed through the bar screens.
In this tank, the speed of the water is decreased so that the sand, dirt and pebbles to settle down.
Removal of solids:
Removal of suspended sludge:
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