Colsen offers services in different branches. In all those branches we are active in consultancy, project realisation and research & development.

Read more about Colsen as a partner here.

5 services
Slibgisting Tiel

Sludge to energy

Sewage sludge is produced during the wastewater treatment process, and processing and disposing of said sludge is a major money and energy sink.

Amfer leidingen


In certain waste and wastewater flows, high quantities of nitrogen occur in the form of ammonium, such as in digestate or centrate produced by a di

Pizzoli NAS

Nitrogen removal

Many sectors produce highly polluted wastewater, with nitrogen being one of the main pollutants. Removing nitrogen can be very expense.

PEKA Kroef

P-recovery with struvite

Phosphate is a crucial component of artificial fertilisers, but the main mining areas are slowly becoming depleted, which makes phosphate recovery

UASB Kroef

Anaerobic water treatment

Due to the high levels of organic pollutants in wastewater, wastewater treatment can be an energy-intensive and therefore a costly affair.