11.6 Granular Filtration

Question 1

relationship between headloss and media size

Answer 1

larger media minimizes headloss

Question 2

relationship between headloss and filtration efficiency

Answer 2

smaller media captures particles better

Question 3

does a high or low uniformity coefficient results in better utilization of filter bed?

Answer 3

low

Question 4

why do media in multimedia filter must be matched?

Answer 4

ensure all media fluidize at the same backwash rate

Question 5

what is placed between the media and underdrains?

Answer 5

layers of gravel

Question 6

what are the five major categories of underdrains?

Answer 6

manifold pipe systems, blocks, screens, false bottom with nozzles, and porous bottom