Input data

Sewage average flow

Maximum average flow

Minimum average flow

Sewage average BOD

Number of filters

Filter diameter

Filter depth

Adopted filter type

Recirculation rate

Output data

Hydraulic rate, recirculation included - see Notes 1

Volumetric organig loading rate - see Notes 2:

Expected efficiency

Effluent BOD

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

References

ASSOCIAÇÃO BRASILEIRA DE NORMAS TÉCNICAS. NBR 12219:2011 - Elaboração de projetos hidráulico-sanitários de estações de tratamento de esgotos sanitários. Rio de Janeiro, ABNT, 2011.

Calculations