Recommendations
Filters: washing flowWashing water collector gutterWell-rounded inletExpansion of the filter bedHead loss in the filter bed during washing

Filters: washing volume

Input data

Ascencional velocity

Superficial area

Washing time

Output data

Washing volume

Description

Given the superficial area of the filter, the washing time, and the desired ascending velocity, the required water washing volume is calculated.

Formula

$$ V_l = A \cdot U_a \cdot t $$ Where:

  • $V_l$ = washing volume $\text{(m³)}$
  • $A$ = superficial area of the filter $\text{(m²)}$
  • $U_a$ = ascending velocity $\text{(m/min)}$
  • $t$ = washing time $\text{(min)}$

FilterFilter

Inputs

Parameter
Standard units
Description
Ascending velocity ($U_a$)
m/min
Desired ascending velocity
Superficial area ($A$)
m²
Superficial area of the filter
Washing time ($t$)
min
Duration of washing

Outputs

Parameter
Standard units
Description
Washing volume ($V_l$)
m³
Total water volume for washing

References

  • AZEVEDO NETTO, J. M. DE. Manual de hidráulica. 9. Ed. São Paulo, Blucher, 2015.