Question
Download Solution PDFWhat is the range of effective size of sand particles (mm) used in slow sand filters?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
|
Slow sand filter |
Rapid sand filter |
|
Low Rate of Filtration (100 - 200 l/hr/m2) |
High Rate of filtration (3000 - 6000 l/hr/m2) |
|
Larger surface area (200 - 2000 m2) |
Smaller surface area (80 - 200 m2) |
|
Larger total depth (3 - 3.5 meters) |
Smaller depth (2.5 - 3 meters) |
|
Pre-treatment not required |
Pre-treatment compulsory |
|
Post-treatment optional |
Post-treatment compulsory |
|
Sand filter characteristics Grain size - 0.20 to 0.40 mm Coefficient of uniformity (grain) - 2 to 3 |
Sand filter characteristics Grain size - 0.35 to 0.55 mm Coefficient of uniformity (grain)- 1.2 to 1.8 |
|
Drainage: Lateral Drainage System |
Drainage: Central Drainage System |
Hence, the most appropriate answer is option 1.
Last updated on May 28, 2025
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