Obtaining process water out of rain from own roof with high energy saving potential compared to current processes.

Motivation and Scope

Rainwater is already chemically very pure. Only some evaporated NH3 is present. Though no salt or hardness is there. Scaling and corrosion is therefore less compared to drinking water. The used technology operates by gravity and without chemicals use. So there is no carbon- and waste footprint.

Process water made out of rain treated with membranes and a biofilter to meet process water standards. Determination of energy savings potential for applications. Evaluating several process water applications:

  • Process water
  • Feed water
  • Boiling feed water


Preciouspitation technology can be applied on any roof. Industrial roofs have high surface areas. This combined with increasing rainfalls gives high potential to replace drinking or ground water as an industrial source.

Acknowledgement & partners

This project is co-funded with subsidy from the Topsector Energy by the Ministry of Economic Affairs and Climate Policy.