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How is sludge removed from sedimentation tank?

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in Food Processing Unit Operations by (110k points)
How is sludge removed from sedimentation tank?

(a) Scraper

(b) Air

(c) Vacuum devices

(d) Scraper and vacuum devices

I had been asked this question by my college professor while I was bunking the class.

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Right answer is (d) Scraper and vacuum devices

The best explanation: The Sludge is removed from the sludge zone in sedimentation tank by scraper or vacuum devices which move along the bottom. Low flow velocities are allowed to enter the sludge zone, or else the sludge could be swept up and out of tank.

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