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Which of the following is a primary treatment?

(a) Sedimentation

(b) Activated sludge

(c) Sand filters

(d) Microstrainers

I had been asked this question by my school teacher while I was bunking the class.

This interesting question is from Effluent in division Recovery and Purification of Fermentation Products, Effluent Treatment, Bioreactor Design Considerations of Fermentation Technology

1 Answer

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The correct answer is (a) Sedimentation

The explanation is: Primary treatment includes physical and chemical methods like sedimentation, coagulation, etc. It will considerably reduce the Biochemical Oxygen Demand of the resulting effluent.

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