CSM RE8040-FEN34

Summary

Product Identification

The CSM RE8040-FEn is described as a high-productivity, new fouling-resistant Reverse Osmosis (RO) membrane element with extended membrane area, suitable for treating brackish water and for wastewater reuse applications.

• Membrane Type: Thin-film Composite
• Membrane Material: PA (Polyamide)
• Membrane Surface Charge: Close to Neutral
• Element Configuration: Spiral-Wound, FRP wrapping

Specifications

Performance is based on initial data taken after 30 minutes of operation under the following conditions: 2,000 mg/L NaCl solution at 225 psig (1.5 MPa) applied pressure, 15 % recovery, 77 °F (25 °C), and pH 6.5~7.0.

• Permeate Flow rate: 10,500 GPD (39.7 m³/day)
• Stabilized Salt Rejection: 99.7 %
• Minimum Salt Rejection: 99.4 %
• Effective Membrane Area: 400 ft² (37.2 m²)
  • Note: Permeate Flow rate for individual elements may vary but will be no more than 10% below the stated value. Effective membrane area may vary within 3%.

Operating Limits

• Max. Pressure drop / Element: 15 psi (0.1 MPa)
• Max. Pressure drop / 240” vessel: 60 psi (0.42 MPa)
• Max. Operating pressure: 600 psi (4.14 MPa)
• Max. Feed flow rate: 252 gpm (57.2 m³/hr)
• Min. Concentrate flow rate: 64 gpm (14.5 m³/hr)
• Max. Operating temperature: 113 °F (45 °C)
• Operating pH range: 3.0 ~ 10.0
• CIP pH range: 2.0 ~ 11.0

Feed Water

• Max. Turbidity: 1.0 NTU
• Max. SDI (15 min): 5.0
• Chlorine concentration: < 0.1 mg/L

Design Guidelines for Various Water Sources (Flux Rates)

• Waste water (SDI < 5): 8 ~ 12 gfd
• Waste water pretreated by UF (SDI < 3): 10 ~ 14 gfd
• Seawater, open intake (SDI < 5): 7 ~ 10 gfd
• High salinity well water (SDI < 3): 8 ~ 12 gfd
• Surface water (SDI < 5): 12 ~ 16 gfd
• Surface water (SDI < 3): 13 ~ 17 gfd
• Well water (SDI < 3): 13 ~ 17 gfd
• RO/UF permeate (SDI < 1): 21 ~ 30 gfd

Saturation Limits for Salts

These values represent the saturation limit at the tail end of the membrane elements for each sparingly soluble salt when used with a proper scale inhibitor.

• CaSO₄: 230 % saturation
• SrSO₄: 800 % saturation
• BaSO₄: 6,000 % saturation
• SiO₂: 100 % saturation

CaCO₃ Scaling Potential Limits (as LSI or SDSI)

• Without scale inhibitor: < -0.2
• LSI (SDSI) with SHMP: < +0.5
• LSI (SDSI) with special inhibitor¹: < +1.5
• SDSI with any inhibitor: < +0.5
  • ¹Special inhibitor refers to an approved organic inhibitor, which should have been approved in a real plant for more than three years.

Mechanical / Hydraulic

• Element Dimensions:
  • A = 40 inch (1,016 mm)
  • B = 16 inch (400 mm)
  • B = 1.12 inch (28 mm)
• One interconnector (coupler) is supplied for each membrane element.
• All CSM membrane elements fit nominal 8.0-inch (203 mm) I.D. pressure vessel.
• Outer features may vary due to design revisions.

Features and Handling

The CSM FEn element is designed for excellent performance in treating feed water with relatively high fouling potential (due to colloidal, biological, and organic fouling agents) even after controlled pretreatment. It offers high durability against CIP chemicals, sustaining fouling-resistant performance through periodic CIP in long-term operation.

• Element boxes must be kept dry at room temperature to prevent freezing and damage from heat.
• If the polyethylene bag is broken, a new protective solution (e.g., 1.0 % sodium bisulfite or sodium metabisulfite) must be added, and the element repackaged air-tight to prevent biological growth. Elements are typically vacuum sealed in a polyethylene bag containing 1.0 % SBS (Sodium bisulfite) solution.
• Elements must be kept moist at all times after initial wetting.
• Permeate water from the first hour of operation should be discarded to flush the protective solution.
• For storage, shipping, or system shutdowns, elements should be immersed in a protective solution (e.g., 1 weight percent sodium bisulfite or sodium metabisulfite, food grade) to prevent biological growth and freeze damage. For short-term storage of one week, 1 weight percent sodium metabisulfite solution is adequate.
• The customer is fully responsible for the effects of incompatible chemicals on elements, and their use will void the element's limited warranty.

The "New FRM" (Fouling Resistant Membrane) variant of this element demonstrates superior flux maintenance compared to regular and older FRM membranes in zero liquid discharge systems, maintaining nearly initial flux over 30 days while others experience significant decline. Salt rejection stabilization depends on feed water conditions and operating parameters. CSM RO elements can be supplied either wet or dry.

---

Disclaimer: This summary is based on the provided text extract and may not include all figures, footnotes, or the latest revisions of the OEM datasheet. For contractual data and complete specifications, refer to the official PDF revision used on your project.

Official datasheet (PDF)

PDF datasheet