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Which of the following physical method is not followed in the primary waste treatment?

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in Environmental Biotechnology by (64.7k points)
Which of the following physical method is not followed in the primary waste treatment?

(a) Rotating screening drums

(b) Separators

(c) Fine rakes

(d) Algal treatment

The question was posed to me in an interview.

I need to ask this question from Wastewater Treatment of Food Processing Industries in section Wastewater Treatment of Food Processing Industries of Environmental Biotechnology

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Best answer
The correct answer is (d) Algal treatment

The explanation is: Rotating screening drums, Separators, Fine rakes, separators, screening catchers etc. are physical method of separation and treatment of the green line wastes, whereas algal treatment is a biological method of treatment which is usually not followed.

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