Recommendations
Filters: washing volumeWashing water collector gutterWell-rounded inletHead loss in stratified clean filter bedHead loss in the filter bed during washing

Expansion of the filter bed

Input data

Temperature

Effective size

Uniformity coefficient

Specific weigth

Porosity

Length (a)

Width (b)

Diameter (D)

Depth of the filter bed

Washing velocity

Output data

Expanded bed depth

Expansion

Description

Givem the temperature, the dimensions of the filter bed, the physics and granulometric characteristics of its media and the washing water velocity, calculates the percentual expansion of the media ant its expanded depth.

Filter bedFilter bed

References

  • AMIRTHARAJAH, A; CLEASBY, J. L. Predicting expansion of filters during backwash. Journal AWWA, v. 64, n. 1, p. 52-9, jan. 1972.