The period of cleaning of a slow sand filter, is usually-
-
A.
5 to 10 days
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B.
Three months to six months
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C.
One month to three months
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D.
Two weeks to three weeks
Correct Answer:
C. One month to three months
Explanation:
Slow sand filters operate by forming a biological layer known as the schmutzdecke, which effectively removes impurities over time. As this layer thickens, the filtration rate decreases, necessitating a periodic cleaning process that involves scraping the top layer of sand. Under typical operating conditions and water quality, this maintenance is generally required every one to three months to ensure the system continues to function efficiently.
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