Within the urban sewage treatment there are several treatment processes depending on the contamination charges and the population calculation. In urban sewage treatment, biological treatments are the strongest and most economic tool in the designer’s hands, which normally for the central nucleus of the plant complemented by mechanical or physical-chemical treatments.

Depurnord’s experience and activity in biological treatments enables us to develop a complete programme which we briefly list below:

- Activated muds
- Aerated lagoons
- Compact
- Oxipack
- Bioblock
- SBR
- MBR