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In which of the following, large impurities are attached with air bubbles to remove it from the wastewater?

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in Environmental Engineering by (81.4k points)
In which of the following, large impurities are attached with air bubbles to remove it from the wastewater?

(a) Sludge digestion tank

(b) Primary sedimentation

(c) Vacuum floatation

(d) Oxidation pond

I have been asked this question in semester exam.

My question comes from Grit Chambers, Tanks and Vacuum Floatation in division Unit Operations for Wastewater Treatment, Preliminary Treatment of Environmental Engineering

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The correct answer is (c) Vacuum floatation

The best explanation: In skimming tanks, large impurities are attached with air bubbles to decrease its density, they float in sewage and are finally removed by skimming troughs.

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