Once wastewater is slowed down, it is let into large settlement tanks. Which of the following contaminants are removed as sludge in this process? (You may choose more than one option).

Small plastics

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Human excreta

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Large suspended solids

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Bacteria

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Solution

The correct options are
B
Human excreta

C
Large suspended solids

Large suspended solids usually include human excreta and other organic wastes. These settle down in the settlement tanks and are removed. This settled waste is called sludge. Plastics, detergent foam, oils float above water and are skimmed off.

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Question 20

Given below is a jumbled sequence of the processes involved in a wastewater treatment plant. Arrange them in their correct sequence.
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(b) Water is made to settle in a large tank with a slope in the middle.
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