Biological ponds

Indicative surface area of a biological pond from design PE, surface loading and primary treatment efficiency.

Indicative surface area of a biological pond from design PE, surface BOD₅ loading and primary treatment efficiency (septic tank, slot tank).

Design population PE [–]

Design surface loading [g BOD₅/m²/day]

Primary treatment efficiency [%]

BOD₅ load before primary step [g/day]

6 000

Residual load after primary step [g/day]

6 000

Pond surface A [m²]

1 000

Area per PE [m²/PE]

For ponds without primary treatment and surface loading 6 g BOD₅/m²/day, the area is roughly 10 m²/PE.

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