A rapid filter unit is to produce a maximum flow of
23,000 m3
/day. The nominal filtration
rate is 120 m/day and is not to exceed 180 m/day with one filter
being backwashed nor 240
m/day with one filter being backwashed and one filter out of
service. Determine the number
of filter units required and the individual filter area. How much
water is required to wash
one filter if the backwash rate is 1 m/min and the duration is 10
minutes?
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