8. Glossary

Population equivalents (PE); population equivalent

One p.e. corresponds to a discharge of 60 g/d of BOD ₅ (five-day biochemical oxygen demand), as defined by the 1991 European directive on urban wastewater treatment.

Filtre compact ; compact filter

A compact filter system comprises a primary treatment stage, generally carried out by an all-water tank (AWT), followed by secondary treatment by biological filtration.

Microstation; aerated treatment unit

The "microstation" family stems from the treatment processes used in collective wastewater treatment, and groups together all treatment systems with electromechanical aeration for biological treatment purposes. This family is subdivided into two categories: "free cultures"...