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When the impurities are separated by the gravitation of settling particles, the operation is called ______

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When the impurities are separated by the gravitation of settling particles, the operation is called ______

(a) Sedimentation with coagulant

(b) Plain sedimentation

(c) Secondary sedimentation

(d) Disinfection

The question was asked during an interview.

Question is taken from Types of Settling Tanks in portion Sedimentation and Chemical Clarification of Environmental Engineering

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Best answer
Right option is (b) Plain sedimentation

The best explanation: In plain sedimentation, the impurities are separated from a suspending fluid by use of natural forces like gravitational forces.

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