Design a Rapid Sand filter for a population of 1, 00,000 with water supply of 220 lit/head/day. Also design under drainage system and wash water troughs Assume data if necessary.
Answers
Explanation:
Example 8.2: Design a set of rapid sand filters for treating water required for a population of 80,000 . Rate of water supply =200 lit/hr/day. The filters are rated to work at 5000 lit /hr/m2 . Show the arrangement of filter units.
Solution : 1] Daily demand =80,000×200=16×106 lit/day
2]. Assume 3% of filtered water is used for washing filter everyday. Also assume that 30 minutes are required for filter washing.
3] Quantity of filtered water per hour
=1.03×16×106(24−0.5)=0.7012766×106lit/hr
4] ∴ Fiter area required =A=0.7012766×1065000=140.25≈140m2
5] Let the size of each filter unit be 9m×5.5m
No. of units required =14049.5=2.82≈3
Provide one unit as stand by. Hence, provide 4 units each of size 9m×5.5m
Explanation:
Daily demand =80,000×200=16×106 lit/day
2]. Assume 3% of filtered water is used for washing filter everyday. Also assume that 30 minutes are required for filter washing.
3] Quantity of filtered water per hour
=1.03×16×106(24−0.5)=0.7012766×106lit/hr
4] ∴ Fiter area required =A=0.7012766×1065000=140.25≈140m2
5] Let the size of each filter unit be 9m×5.5m
No. of units required =14049.5=2.82≈3
Provide one unit as stand by. Hence, provide 4 units each of size 9m×5.5m