Dual Porosity Filtration (DPF) treats contaminated surface water, for instance water from roads, so it can meet high environmental standards. DPF technology treats the water to a high quality without the use of chemicals and holds the potential to transform contaminated surface water into drinking water.
How does it work?
A dual porosity filter has two porosities, high and low. The filter consists of a dual layer with a high porosity layer on top of a low porosity layer. The high porosity layer is a flow layer, while the low porosity layer accumulates impurities. That is how clogging is avoided. Treatment is based on sedimentation and sorption without the use of polymers, coagulants or other chemicals.
Rainfall and water surfacing will increase in the future, particularly in urban areas, leading to greater amounts of contaminated surface water. DPF technology grasps the challenge of contaminated surface water by transforming it into an asset for the city. Also, the growing pressure on traditional treatment and drainage systems are relieved.
DPF was patented in Denmark in 2002 and the technology is continuously tested and refined. The plants have been optimised for industrial production and tested on a large scale with positive results.