DOW FILMTEC Fiberglassed Elements for Light Industrial Systems.
Proper start-up of reverse osmosis water treatment systems is essential to prepare the membranes for operating service and to prevent membrane damage due to overfeeding or hydraulic shock. Following the proper start-up sequence also helps ensure that system operating parameters conform to design specifications so that system water quality and productivity goals can be achieved.
Before initiating system start-up procedures, membrane pretreatment, loading of the membrane elements, instrument calibration and other system checks should be completed.
Please refer to the application information literature entitled “Start-Up Sequence” (Form No. 609-02077) for more information.
Avoid any abrupt pressure or cross-flow variations on the spiral elements during start-up, shutdown, cleaning or other sequences to prevent possible membrane damage. During start-up, a gradual change from a standstill to operating state is recommended as follows:
- Feed pressure should be increased gradually over a 30-60 second time frame.
- Cross-flow velocity at set operating point should be achieved gradually over 15-20 seconds.
- Permeate obtained from first hour of operation should be discarded.
- Keep elements moist at all times after initial wetting.
- If operating limits and guidelines given in this bulletin are not strictly followed, the limited warranty will be null and void.
- To prevent biological growth during prolonged system shutdowns, it is recommended that membrane elements be immersed in a preservative solution.
- The customer is fully responsible for the effects of incompatible chemicals and lubricants on elements.
- Maximum pressure drop across an entire pressure vessel (housing) is 50 psi (3.4 bar).
- Avoid static permeate-side backpressure at all times.
|Product||Part Number||Feed Spacer Thickness (mil)||Permeate Flow Rate gpd (m3/d)||Stabilized Salt Rejection (%)|
DOW FILMTEC™ brackish water reverse osmosis membrane elements provide consistent, outstanding system performance in light industrial applications.
- DOW FILMTEC LE-4040 delivers highest performance at lowest pressure resulting in less energy usage and lower costs.
- DOW FILMTEC BW30-4040 is the industry standard for reliable operation and production of the highest quality water.
- DOW FILMTEC BW30-2540 elements are designed for systems smaller than 1 gpm (0.2 m3/h) offering a hard shell exterior for extra strength.
Elements with a hard shell exterior are recommended for systems with multiple-element housings containing three or more membranes, as they are designed to withstand higher pressure drops.
- Membrane Type Polyamide Thin-Film Composite
- Maximum Operating Temperature 113ºF (45ºC)
- Maximum Operating Pressure 600 psi (41 bar)
- Maximum Feed Flow Rate - 4040 elements 16 gpm (3.6 m3/h)
- 2540 elements 6 gpm (1.4 m3/h)
- Maximum Pressure Drop 15 psig (1.0 bar)
- pH Range, Continuous Operation 2 - 11
- pH Range, Short-Term Cleaning 1 - 13
- Maximum Feed Silt Density Index SDI 5
- Free Chlorine Tolerance <0.1 ppm
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