Featuring breakthrough membrane chemistry, the DOW FILMTEC HRLE-440i element delivers the same 99.5% nominal NaCl rejection as traditional brackish water elements but at 33% lower pressures.
- High rejection results in excellent water quality
- Reduced downstream polishing required
- High flux reduces energy use
- Durable with good cleanability for long element life
- Filmtec Performance and quality
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 DOW™ FILMTEC™ Reverse Osmosis and Nanofiltration Three-Year Prorated Limited Warranty (Form No. 609-35010) 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 drops are 15 psi (1.0 bar) per element or 50 psi (3.4 bar) per multi-element pressure vessel (housing) whichever value is more limiting.
- Avoid static permeate-side backpressure at all times.
|Product||Part number||Active area ft2 (m2)||Feed spacer thickness (mil)||Permeate flow rate gpd (m3/d)||Stabilized salt rejection (%)||Minimum salt rejection (%)|
|HRLE-440i||347733||440 (41)||28||12,650 (48)||99.3||99.5|
|Typical Stabilized Rejections for Individual Solutes|
|Silica rejection (%)||Boron rejection (%)||Nitrate rejection (%)||Ammonium rejection (%)||Isopropyl alcohol rejection (%)|
- Lower energy requirements allow new reverse osmosis systems to be designed to use one third less energy and still deliver the same permeate quality compared with other BW elements
- Existing low energy systems can be retrofitted to achieve lower permeate TDS than possible with previous low energy elements
- The combination of low energy and high rejection is ideally suited for use in the second pass of seawater and high-purity applications
- Excellent rejection of silica, boron, nitrate and ammonium; supported by Dow’s modeling software
- Increased IPA rejection (IPA rejection is a common surrogate for TOC removal)
- Available dry for longer storage life and easier handling
- Membrane Type Advanced Polyamide Thin-Film Composite
- Maximum Operating Temperature 113°F (45°C)
- Maximum Operating Pressure 600 psig (41 bar)
- Maximum Pressure Drop 15 psig (1.0 bar)
- pH Range, Continuous Operation 2 - 11
- pH Range, Short-Term Cleaning (30 min.) 1 - 13
- Maximum Feed Flow 85 gpm (19 m3/h)
- Maximum Feed Silt Density Index SDI 5
- Free Chlorine Tolerance <0.1 ppm
- Industrial water demineralization
- Production of municipal drinking water
- Water reuse
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