11.4 Granular Filtration

Question 1

what are the four hydraulic issues that are considered in the design?

Answer 1

headloss through clean filter bed, headloss from the accumulation of particles in the bed, fluidization depth fo the bed during backwashing, headloss in expanding the filter bed

Question 2

clean filter headloss - the headloss is directly proportional to the square of the ____________ _________ so small increases are amplified

Answer 2

loading rate

Question 3

clean filter headloss - the headloss is inversely proportional to ________ of the sand grains

Answer 3

diameter

Question 4

clean filter headloss - plays a very strong inverse role in the headloss

Answer 4

porosity