Full Description

Recently commissioned Vitens nanofiltration (NF) and reverse osmosis (RO) treatment plants were provided with the Optiflux stackconfiguration. Optiflux is the optimization of the permeate productivity of spiral-wound NF andRO membrane filtration plants, in relation to the permeate quality and the occurring concentrationpolarization. This design shows that optimization of permeate productivity has to be done byminimizing hydraulic losses and the osmotic pressure difference across membrane surface. Anincrease in permeate productivity of 20% can be achieved, for both NF and RO membranefiltration systems, by lowering the number of membrane modules per pressure vessel to three,which leads to lower hydraulic pressure losses.In Dinxperlo, the difference in feed pressure between the traditional design (800 kPa) and theOptiflux design (720 kPa) is calculated, in spite of the equal flux of 25.6 l/msup2/sup/h in both designs.If the traditional feed pressure of 800 kPa is applied to the Optiflux stack design, theflux increases to 28.8 l/msup2/sup/h. This results in a permeate production of 90 msup3/sup/h instead of 80msup3/sup/h in the traditional design. This is a significant increase in permeate flow of 12.5 %, with acorresponding installed membrane surface and energy consumption. The studyconcludes that an Optiflux design with 3 elements per stage in center port pressure vessels isan interesting economical alternative for the traditional NF and RO designs. The yield will gain ifwe take into account the expected future increase in energy costs and reduction in pressurevessel costs. Includes 5 references, tables, figures.

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Edition: Vol. - No. Published: 11/01/2009 Number of Pages: 8File Size: 1 file , 800 KB