1. FILTRATION III EXAMPLE

2. Dr

3. Example: Determination of clean water headloss in granular-medium Filtration
Determine the effective size, the uniformity coefficient, and the clean water headloss in a filter bed composed of 0.75 m of uniform sand size distribution given below Table for a filtration rate of 160 L/m2. min. Assume that the operating temperature is 20 0C. Use the Rose Equation for computing the headloss. Assume the porosity of the sand in the various layer is 0.40 and use a value of 0.85 for the shape factor of the sand Dr

4. Dr

5. Dr

6. Dr

7. Dr

8. Dr

9. Example: Determination of required backwash velocities for filter cleaning.
Filter of sand bed of 0.4 porosity with size distribution given below is to be backwashed at a rate of 0.7 m/min. Determine the degree of expansion and whether the proposed backwash
Rate will expand all of . Assume the following date are applicable: Dr

10. Or Dr

11. Dr

12. Dr

13. Dr

14. END Dr