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DOW FILMTEC BW30-400/34i Membrane

Product Description

 

Uses for BW30-400/34i Membrane Elements

Advantages:

  • High rejection gives good water quality;
  • durable with good cleanability for long element life;
  • Filmtec Performance and quality

Important Information

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.

Operation Guidelines

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.

General Information

  • 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 drop across an entire pressure vessel (housing) is 50 psi (3.4 bar).
  • Avoid static permeate-side backpressure at all times.
[custom-specifications]

Specifications:

Product Part number Active area ft2 (m2) Feed spacer thickness (mil) Permeate flow rate gpd (m3/d) Stabilized salt rejection (%) Minimum salt rejection (%)
strong>BW30-400/34i 248151 400 (37) 34 10,500 (40) 99.50% 99.00%
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[custom-features]

Features:

The DOW FILMTEC™ BW30-400/34i element is the ultimate element for durable, high-rejection, high-productivity performance in high fouling or challenging feed conditions, enabling trouble-free operation and a low cost of water.
• Features a 34 mil feed spacer to lessen the impact of fouling on pressure drop across a vessel and enhance cleaning effectiveness.
• Offers the proven performance and high productivity of the DOW FILMTEC BW30 membrane
• Delivers a lower total cost of water by enabling lower capital and/or operating expenses compared to 365 sq. ft. elements.
• Includes iLEC™ interlocking endcaps, which reduce system operating costs and the risk of o-ring leaks that can cause poor water quality.

Operating Limits

  • Membrane Type Polyamide Thin-Film Composite
  • Maximum Operating Temperaturea 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/hr)
  • Maximum Feed Silt Density Index SDI 5
  • Free Chlorine Tolerance <0.1 ppm
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[custom-usage]

Ideal Applications Include:

Industrial water demineralization
Production of municipal drinking water
Water reuse

[/custom-usage]
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