Beenen won the contract to renovate and expand the sewage treatment plant (RWZI) in Oostmarsum. In addition to a traditional treatment plant with a secondary settler and a sand filter, a revolutionary membrane system was also installed.
This new technology makes it possible to separate the active sewage sludge from the water on a much smaller surface space than usual, before the very clean water is channelled into a beautiful nature area.
After this thorough renovation and implementation of changes, the RWZI will fulfil the European requirements for the treatment of waste water, and gives the water authority of Regge and Dinkel the option to experiment with this new technology, and to compare the results with traditional methods.
The RWZI was almost completely replaced. Only the secondary settler, the sewage channel and some basins were retained in use. To keep treatment processes going during the renovation works, it was decided to insert the existing control box into a sea container and operate it from there. With the new situation, two separate boxes for different buildings are involved. The link between these two boxes is provided by glass fibre. This allows the PLCs to communicate with each other. The other separate system components, for instance frequency controllers, compressors and the membrane channels, are regulated with the help of remote I/O islands.
These I/O islands are linked via plastic fibres and plastic transformers to the buyer. These plastic fibres have been produced and assembled by Koldijk themselves, just like the complete controls and screen operation. The complexity of the project actually lies in the coordination between the different parties involved (2 electro-technical and 5 engineering contractors) and the proper translation of the membrane purification controls . Usually, these controls are provided by the supplier of the membrane system, but at the request of the Regge and Dinkel water authority, these controls were also produced by Koldijk.