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Water & Wastewater Treatment and Management Question on Wastewater

With respect to particle settling in wastewater treatment systems; the correct statement(s) is/are

A

Settling in grit chamber and primary sedimentation tanks are examples of Type-I settling

B

Settling in primary sedimentation tank and secondary sedimentation tank are examples of Type-II settling

C

Settling in grit chamber is an example of Type-I settling, whereas settling in primary sedimentation tank is an example of Type-II settling

D

Settling in secondary sedimentation tank is an example of Type-III settling, whereas settling in primary sedimentation tank is an example of Type-II settling

Answer

Settling in grit chamber is an example of Type-I settling, whereas settling in primary sedimentation tank is an example of Type-II settling

Explanation

Solution

The correct answer is (C and D) : Settling in grit chamber is an example of Type-I settling, whereas settling in primary sedimentation tank is an example of Type-II settling AND Settling in secondary sedimentation tank is an example of Type-III settling, whereas settling in primary sedimentation tank is an example of Type-II settling