(a) In the filtration process of a water treatment plant, the backwash water for its rapid sand filter is taken from the
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(a) In the filtration process of a water treatment plant, the backwash water for its rapid sand filter is taken from the
(a) In the filtration process of a water treatment plant, the backwash water for its rapid sand filter is taken from the filtered water. The rate of filtration is 150 m/day while backwashing is rated at 15 mm/s. Estimate the percentage of filtered water required for backwashing if the flow rate is 300 L/s and backwashing takes 15 minutes every day. [10 Marks]