Unique RO installation for Vitens

Vitens, Netherlands largest water company, supplies drinking water to over four million people and tens of thousands of companies in the provinces of Friesland, Gelderland, Overijssel, the Noordoostpolder and various places in Drenthe. When viewed from the number of connections, Vitens supplies approximately a quarter of the Dutch drinking water market. On 16 March 2006, Vitens contracted Logisticon to build a membrane filtration installation for the Dinxperlo pumping station located in Vitens Region of Gelderland. The installation consists of four reverse osmosis (RO) membrane skids, which have a combined production capacity of 320 m3/hour. In addition to delivering the membrane filtration installation, the project also included the extension of the high-pressure section (distribution pumps), the delivery of chemical dose-measuring systems, low- and high-pressure pumps, the electrical system and the controlling section.

Unique installation

The membrane filtration installation design is based on the Optiflux concept that Vitens helped to develop. When compared to Vitens existing Optiflux installations, this project distinguishes itself in part by the application of a newly developed Bekaert (8”) membrane pressure vessel. The use of this pressure vessel was a world first for the parties involved. With these pressure vessels the concentrate is discharged in the middle of the vessel.


The reverse osmosis (RO) membrane filtration installation operates using the Optiflux principle, where the pressure vessel is fed from two sides. The main advantage of Optiflux, when compared to traditional membrane installations, is that it provides a saving of 15-20% of energy or membrane surface area. Thanks to a lower membrane flux in the last stage, the probability of contamination is reduced. Vitens has already used this patented system, including nanofiltration membrane systems, in Zwolle and Witharen.

Softer and cleaner drinking water

Vitens will solve two problems at the same time with the new Dinxperlo plant. In 2007, Vitens will supply the entire Achterhoek area with softer drinking water, because high water hardness leads to scaling and a reduction in the effectiveness of detergents. The other problem is that for years the Dinxperlo pumping station has suffered from an increased level of pesticides and herbicides in the water extracted from the ground. For this reason, in 2004 a temporary remediation system using active carbon filtration was installed (see LogistiContour 9). This now will become superfluous with the new system.

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