Input data

Average upflow

Maximum upflow

Upflow BOD

Support environment

Filter's depth

Number of biological filters

Diameter of the filter

Recirculated sewage flow

Output data

Recirculation ratio

Recirculation factor

Hidraulic load for the maximum flow

Organic load

Efficiency

Downflow DOB

Description

Given the incoming average and maximum flow, the incoming BOD, the number of filters, the geometric characteristics of each filter and the recirculation flow, calculates the treatment efficiency and the effluent BOD.

Percolator Filter

Operation and project caracteristcs of PBF

Support environment	Rocks	Plastic
Number	1	2
Hidraulic load minimum (m³/m².day)	10	10
Hidraulic load maximum (m³/m².day)	50	75
Organic load (kg BOD/m³.day)	<1.2	<3.0
Minimum depth (m)	1.5	4
Maximum depth (m)	2.5	12
Minimum recirculation ratio	1	1
Maximum recirculation ratio	2	3
Minimum efficiency of BOD removal (%)	80	80
Maximum efficiency of BOD removal (%)	90	90

Description

Percolator Filter

Operation and project caracteristcs of PBF

Support environment	Rocks	Plastic
Number	1	2
Hidraulic load minimum (m³/m².day)	10	10
Hidraulic load maximum (m³/m².day)	50	75
Organic load (kg BOD/m³.day)	<1.2	<3.0
Minimum depth (m)	1.5	4
Maximum depth (m)	2.5	12
Minimum recirculation ratio	1	1
Maximum recirculation ratio	2	3
Minimum efficiency of BOD removal (%)	80	80
Maximum efficiency of BOD removal (%)	90	90

References

Jordão, E. P.,Pessôa, C. A. Tratamento de esgotos domésticos.7. Ed. Rio de Janeiro: ABES, 2014.