11.2 Granular Filtration Flashcards
Filter Media Characteristics
1
Q
media grain diameter at which 10% of the media by weight is smaller
A
effective size
2
Q
ratio of the diameter at which 60% weight is smaller to the 10% sizes
A
uniformity coefficient
3
Q
sand excavated from a natural deposit
A
run-of-bank sand
4
Q
what is the hardness of the filter material indicate?
A
resistance to abrasion during backwashing
5
Q
what does the porosity of the in-place media affect?
A
headloss and filtration efficiency
6
Q
what is the selection of media used in dual and tri media filters based on?
A
specific gravity of media
7
Q
media characteristic that plays a role in the arrangement of the filer media and the backwash flow requirements that are required to fluidize the bed
A
specific gravity
