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The turbidity of water applied to rapid sand filter is less than _______

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The turbidity of water applied to rapid sand filter is less than _______

(a) 35-40ppm

(b) 10-20ppm

(c) 30-40ppm

(d) 10-15ppm

I got this question during a job interview.

This interesting question is from Comparison Between Slow and Rapid Sand Filter topic in section Filtration of Environmental Engineering

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Best answer
Correct answer is (a) 35-40ppm

The best I can explain: As before filtration, sedimentation and coagulation process is done, so the turbidity of water should be less than 35-40ppm.

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