What is the ratio of back-washing of filtration in a typical rapid sand filter?
Correct Answer:
C. 6
Explanation:
In a rapid sand filter, the backwashing process involves reversing the water flow to remove trapped debris and particles from the filter media. This procedure requires a significantly higher flow rate than the normal filtration process to effectively fluidize the sand bed and wash away contaminants. Standard engineering guidelines and operational practices indicate that the typical ratio of the backwash rate to the filtration rate is approximately 6 to 1. This ensures sufficient velocity to expand the media and clean the filter within a short duration, usually between 5 to 15 minutes, without causing excessive loss of the filter sand.
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