1. ENG421 (9c) – Filtration
Filtration – design examples

2. Filtration – design criteria (1 of 3)
Filter media grain size – filter depth relationship

3. Filtration – design criteria (2 of 3)
Slow sand filters

4. Filtration – design criteria (3 of 3)
Rapid sand and high-rate filters

5. Filtration – design example 1 (1 of 2)

6. Filtration – design example 1 (2 of 2)

7. Filtration – design example 2 (1 of 6)

8. Filtration – design example 2 (2 of 6)

9. Filtration – design example 2 (3 of 6)
Backwash flow requirements are a function of grain size (coarse for high-rate filters)

10. Filtration – design example 2 (4 of 6)
Backwash flow requirements are a function of grain size (cont)

11. Filtration – design example 2 (5 of 6)

12. Filtration – design example 2 (6 of 6)

13. References
Droste, R.L., 1997, Theory and Practice of Water and Wastewater Treatment, John Wiley and Sons, New York (TD430D ), pages 416 – 456
Hendricks, D., 2006, Water Treatment Unit Processes, CRC, New York (TD430H ) , pages , , 715 – 762
Kawamura, S., 2000, Integrated Design and Operation of Water Treatment Facilities, 2nd Ed., John Wiley and Sons, New York (TH4538K ), pages 194 – 291
MWH, 2005, Water Treatment Principles and Design, 2nd ed., John Wiley and Sons, New York (TD430 .W ), pages , 955 – 1034
Nemerow, N.L. et al, 2009, Environ Eng : Water, Wastewater, Soil and Ground, 6th ed., John Wiley and Sons, New York (TD430 .E ), pages
Parsons, S.A. and Jefferson, B., 2006, Introduction to Potable Water Treatment Systems, Blackwell, Oxford (TD430 .P ), pages 72 – 94
Viessman, W. et al, 2009, Water Supply and Pollution Control, 8th ed., Pearson, Upper Saddle River, pages