Optiflux® RO design with center port pressure vessels for water treatment plant dinxperlo, the Netherlands

Ron C.M. Jong*, Marc J. Kalf, Walter G.J. Van Der Meer

*Corresponding author for this work

Research output: Contribution to conferencePaperAcademicpeer-review


Recent commissioned Vitens NF and RO treatment plants are provided with the Optiflux® stack configuration. Optiflux® is the optimization of the permeate productivity of spiral-wound NF and RO membrane filtration plants, in relation to the permeate quality and the occurring concentration polarization. This design shows that optimization of permeate productivity has to be done by minimizing hydraulic losses and the osmotic pressure difference across membrane surface. An increase in permeate productivity of 20% can be achieved, for both NF and RO membrane filtration systems, by lowering the number of membrane modules per pressure vessel to three, which leads to lower hydraulic pressure losses. In Dinxperlo a difference in feed pressure between the traditional design (800 kPa) and the Optiflux® design (720 kPa) is calculated, in spite of the equal flux of 25.6 l/m2/h in both designs. If additional the traditional feed pressure of 800 kPa is applied to the Optiflux® stack design, the flux increases to 28.8 l/m2/h. This results in a permeate production of 90 m3/h in stead of the 80 m3/h in the traditional design. This is a significant increase in permeate flow of 12.5 %, with a corresponding installed membrane surface and energy consumption. Thanks to the world scoop at Dinxperlo of using center port pressure vessels, Optiflux® can easily be obtained in RO stacks. In fact two 3 element stacks are contrary to each other connected. Conclusion is that an Optiflux® design with 3 elements per stage in center port pressure vessels is an economical interesting alternative for the traditional NF and RO designs. The yield will gain if we take into account the in the future expected increase in energy costs and reduction in pressure vessel costs.

Original languageEnglish
Publication statusPublished - 2009
Externally publishedYes
EventAWWA Membrane Technology Conference and Exposition 2009 - Memphis, United States
Duration: 15 Mar 200918 Mar 2009


ConferenceAWWA Membrane Technology Conference and Exposition 2009
Country/TerritoryUnited States


  • Center port
  • Centre port
  • Nano filtration
  • Optiflux
  • Pressure vessel
  • Reverse osmosis
  • Side port


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