The filtration unit will be built in autumn 2018 and its schedule follows the construction of the separate sewage piping in Mechelininkatu and Eteläinen Hesperiankatu. The filtration unit will be located at an outfall of a stormwater pipe that gathers stormwater from heavily trafficked roads. Depending on the rain event, the filtration unit will capture part of the stormwater which would otherwise be discharged to the sea without a treatment.
Technology validated in relevant environment.
Fidelity of breadboard technology increases significantly. The basic technological components are integrated with reasonably realistic supporting elements so they can be tested in a simulated environment. Examples include “high-fidelity” laboratory integration of components.
The innovation has been validated in lab: a prototype was built and flow measurements were taken. Different filter materials have been tested in another project by VTT. The filtration unit will be built in autumn 2018 and monitoring will be set up late 2018.

How does it work?

Objective of Helsinki’s stormwater filtration unit is to clean stormwater mechanically without input of external energy. The purification process is based on sedimentation (detention basin) and filtration.