On behalf of the Municipality of Putten, Anacon-Infra performed a technical evaluation for the use of the DSI technology. From the autumn of 2016 through to 2018, various filter solutions were tested, including pre-filter systems from other suppliers.
The evaluation mainly focused on the management aspects and possible contamination of the system. Unfortunately, however, none of the filter solutions tested led to a satisfactory result that could be deployed on a large scale in the Municipality of Putten.
Blocked filters
The use of DSI as a primary infiltration facility did not work with the deployed filter solutions because the DSI filter became blocked in the receiving well. This was because the rainwater was not clean enough. Contamination of the filters and the associated decrease in their uptake capacity resulted in too much risk of flooding and in high management costs due to the cleaning required.
Comparison with other projects
In consultation with the project partners, the results from the experiment in Putten were compared with three other operational projects where DSI is used: projects in the Dutch municipalities of Epe and Brummen, and the German municipality of Potsdam. This revealed that DSI worked well in Epe and Brummen because an extra filtration system was used there.
Cleaning rainwater is vital
This test the Municipality of Putten revealed that cleaning of rainwater is vital for the successful use of DSI. If the rainwater is cleaned well enough, then it is possible to deploy DSI effectively.
On behalf of the Municipality of Putten, Anacon-Infra performed a technical evaluation for the use of the DSI technology. From the autumn of 2016 through to 2018, various filter solutions were tested, including pre-filter systems from other suppliers.
The evaluation mainly focused on the management aspects and possible contamination of the system. Unfortunately, however, none of the filter solutions tested led to a satisfactory result that could be deployed on a large scale in the Municipality of Putten.
Blocked filters
The use of DSI as a primary infiltration facility did not work with the deployed filter solutions because the DSI filter became blocked in the receiving well. This was because the rainwater was not clean enough. Contamination of the filters and the associated decrease in their uptake capacity resulted in too much risk of flooding and in high management costs due to the cleaning required.
Comparison with other projects
In consultation with the project partners, the results from the experiment in Putten were compared with three other operational projects where DSI is used: projects in the Dutch municipalities of Epe and Brummen, and the German municipality of Potsdam. This revealed that DSI worked well in Epe and Brummen because an extra filtration system was used there.
Cleaning rainwater is vital
This test the Municipality of Putten revealed that cleaning of rainwater is vital for the successful use of DSI. If the rainwater is cleaned well enough, then it is possible to deploy DSI effectively.