X-Flow-R-21-HFS

Summary

Product identification

The X-flow R-21 0.9UFC is an ultrafiltration membrane module. Its article code is 1521BL895E. It is used for the production of process water, with typical applications including the filtration of surface water and WWTP effluent. Operation modes include feed-and-bleed with a minor crossflow, or dead-end mode with regular backwash (permeate only) and chemically enhanced backwash.

Membrane Characteristics

• Membrane Type: Hydrophilic, composed of a blend of polyvinylpyrrolidone and polyethersulfone (PES/PVP).
• Nominal Pore Size: 20 nm.
• Structure: Asymmetric/microporous.
• Performance: High performance with good anti-fouling behavior.
• Typical Permeate Quality: SDI<3, turbidity <0.1 NTU.
• Reduction Capabilities:
  • 99.9999% (LOG6) reduction of bacteria (Pseudomonas diminuta) by mechanical means.
  • 99.99% (LOG 4) reduction of virus (MS2 colifages) by mechanical means.
• Burst pressure: > 14 bar
• Collapse pressure: > 10 bar

Module Specifications

• Membrane Diameter: 0.9 mm [35 mil]
• Membrane Area: 4.3 m² [46.3 ft²]
• Module Length A: 1124 mm [44.3 inch]
• Permeate Length B: 71 mm [2.8 inch]
• Permeate Position C: 87 mm [3.4 inch]
• Feed Connection Diameter D: 63 mm [2.5 inch]
• Permeate Connection Diameter E: 20 mm [0.8 inch]

Materials of Construction

• Housing: PVC-C
• Potting: Epoxy
• Membrane: PES/PVP

Operating Limits

• Max. System Pressure: 600 kPa [86 psi] @ 20 °C
• Max. Trans-membrane Pressure: 300 kPa [43 psi]
• Max. Backflush Pressure: 300 kPa [43 psi]
• Temperature Range: 0 - 60 °C [32 - 140 °F]
• Temperature Change Rate: Do not subject the module to sudden temperature changes, particularly decreases. Bring back to ambient operating temperature slowly (max. 3 °C/min).
• pH during filtration:
  • Acids: pH > 2
  • Bases: pH < 12
• pH during cleaning:
  • Acids: pH > 1
  • Bases: pH < 13

Process Characteristics (Hydraulic)

(Water, 20 °C)

• Hydraulic Membrane Diameter: 0.8 mm [31 mil]
• Crossflow Flow Rate: 3.4 x v m³/h [15.0 x v gpm], where 'v' is superficial velocity in m/s [ft/s].
• Pressure-drop across module:
  • At 1 m/s: 40 kPa [5.80 psi]
  • At 2 m/s: 84 kPa [12.18 psi]

Chemical Resistance

(Indications are guidelines, as resistance depends on actual process conditions)

Solvent Resistance

• Acids: ++
• Bases: ++
• Organic esters, ketones, ethers: -
• Aliphatic alcohols: +
• Aliphatic hydrocarbons: +
• Halogenated hydrocarbons: --
• Aromatic hydrocarbons: --
• Polar organic solvents: --
• Oils: ++

Cleaning Chemical Resistance

• Acids: Hydrochloric Acid (++), Nitric Acid (++), Sulphuric Acid (++), Phosphoric Acid (++), Acetic Acid (++), Citric Acid (++)
• Bases: Sodium Hydroxide (++), Potassium Hydroxide (++)

Oxidant Resistance

(Exposure limits are also affected by temperature, pH, and presence of metals. Reduce exposure to a minimum for membrane lifetime.)

• Sodium Hypochlorite (NaOCl):
  • Typical: 200 ppm, at ≤ 40 °C at ≥ pH 9
  • Maximum: 500 ppm
  • Cumulative: 250,000 ppm hours; pH 11
• Chlorine Dioxide (ClO₂):
  • Typical: 1 ppm, at ≤ 40 °C
  • Maximum: 2 ppm
  • Cumulative: 90,000 ppm hours; pH 11
• Hydrogen Peroxide (H₂O₂):
  • Typical: 200 ppm, at ≤ 40 °C
  • Maximum: 500 ppm
  • Cumulative: 350,000 ppm hours
• Combined exposure (NaOCl + ClO₂): 2.6 x Exposure to ClO₂ (in ppm hours) + Exposure to NaOCl (in ppm hours) < 250,000 ppm hours

Certifications

• ISO 9001
• EPA Est. No. 090374-NLD-001

Storage

• New Membrane Modules:
  • Stored as supplied in original packaging.
  • Contain an aqueous preservation solution of glycerine (20wt%) and sodium metabisulfite (1wt%).
  • Store in a dry, normally ventilated place, away from sources of heat, ignition, and direct sunlight.
  • Store between 0 and 40 °C.
  • Should not be subjected to freezing temperatures.
  • Shelf life is a maximum of 6 months for unused modules in unopened packaging under correct storage conditions after transfer of ownership to the client.
• After Use (Wet Storage):
  • UF membrane modules need to be stored wet at all times.
  • To avoid biological growth, wet membranes can be treated with a compatible biocide.
  • Short-term shutdowns (1–7 days): A daily backwash with UF permeate quality water for 30 seconds at 215 lmh should be adequate for bacteria control. Before shutdown, modules must be cleaned by a standard Chemical Enhanced Backwash (CEB).
  • Long-term storage (>7 days): Membranes should be disinfected. Clean membranes using a CEB before disinfection. A 0.5% sodium metabisulfite solution can be used for disinfection. In both short and long-term storage, modules should remain filled with storage solution.

---

Disclaimer: This summary is based on extracted text and may not include all figures, footnotes, or the latest revisions. Contractual data must match the OEM PDF revision used on the project.

Official datasheet (PDF)

PDF datasheet