Aquaflex 55

Summary

Product identification

The Aquaflex 55 is an ultrafiltration module designed for the production of process and potable water. Typical applications include the filtration of surface water, potable water, and WWTP effluent.

• Article Code: 23E1FL395H
• Membrane Material: Hydrophilic blend of polyvinylpyrrolidone and polyethersulfone (PES/PVP)
• Membrane Structure: Asymmetric/microporous
• Nominal Pore Size: 20 nm
• Housing Material: PVC white
• Flow Distributor Material: PVC/PP
• Potting Material: PU resin
• EPA Est. No.: 090374-NLD-001

Operating limits

• Max. System Pressure: 300 kPa [43 psi]
• Max. Transmembrane Pressure: 300 kPa [43 psi]
• Max. Backflush Pressure: 300 kPa [43 psi]
• Temperature Range: 0-40 °C [32-104 °F]
• pH during filtration: > 2 (Acids), < 12 (Bases)
• pH during cleaning: > 1 (Acids), < 13 (Bases)
• Temperature Change Rate: Max. 3 °C/min to avoid mechanical damage.

Feed water

• Mode of Operation: Feed-and-bleed with a minor crossflow, or dead-end mode with regular backwash (permeate only) and chemically enhanced backwash.
• Backwash Water Quality: Should be free of particulates and of UF permeate quality or better.

Product water

• Typical Permeate Quality: SDI<3, turbidity <0.1 NTU
• Bacteria Reduction: 99.9999% (LOG6) reduction of bacteria (Pseudomonas diminuta) by mechanical means.
• Virus Reduction: 99.99% (LOG 4) reduction of virus (MS2 colifages) by mechanical means.

Mechanical / hydraulic

• Membrane Diameter: 0.8 mm [31 mil]
• Membrane Area: 55 m² [590 ft²]
• Feed Connection D0: 220.0 mm [8.66 Inch]
• Module Length L0: 1537.5 mm [60.51 Inch]
• Permeate Connection d0: 42.6 mm [1.68 Inch]
• Dry Weight of Membrane Element: ca. 34 kg [75 lbs]
• Membrane Element Filled with Water: ca. 66 kg [145 lbs]
• Hydraulic Membrane Diameter: 0.8 mm [31 mil]
• Crossflow Flow Rate: 27.5 x v m³/h [37 x v gpm] (where v is superficial velocity in m/s [ft/s])
• Pressure-drop across module at 1 m/s: 72 kPa [10 psi]
• Pressure-drop across module at 2 m/s: 150 kPa [21 psi]

Chemical resistance

The resistance of the membrane to solvents strongly depends on actual process conditions; indications are guidelines only.

General solvent resistance

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

Cleaning chemical resistance

It is advised to reduce membrane exposure to oxidizing agents to a minimum to maximize lifetime. Exposure limits are affected by temperature, pH, and the presence of metals.

• Oxidants:
  • Sodium Hypochlorite (NaOCl):
    • Typical: 200 ppm, at ≤ 40 °C, at ≥ pH 10
    • Maximum: 500 ppm
    • Cumulative: 250,000 ppm hours; ≥ pH 10
  • 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): Calculated as 2.6 x Exposure to ClO₂ (in ppm hours) + Exposure to NaOCl (in ppm hours) < 250,000 ppm hours.
• Acids:
  • Hydrochloric Acid: ++
  • Nitric Acid: ++
  • Sulphuric Acid: ++
  • Phosphoric Acid: ++
  • Acetic Acid: ++
  • Citric Acid: ++
• Bases:
  • Sodium Hydroxide (<4%): ++
  • Potassium Hydroxide (<4%): ++

Storage

• New Membrane Modules: Store as supplied in original packaging, in a dry, normally ventilated place, away from sources of heat, ignition, and direct sunlight. Store between 0 and 40 °C. Do not subject to freezing temperatures.
• Preservation Solution: New elements contain an aqueous preservation solution of glycerine (20wt%) and sodium metabisulfite (1wt%).
• Shelf Life: Maximum 6 months for unused modules in unopened packaging under correct storage conditions.
• After Use: UF membrane modules must be stored wet at all times.
  • Short-term Shutdowns (1-7 days): A daily backwash with UF permeate quality water for 30 seconds at 250 lmh should be adequate for bacteria control. Modules must be cleaned by a standard Chemical Enhanced Backwash (CEB) before the shutdown period.
  • Long-term Storage (> 7 days): Membranes should be disinfected after a CEB. 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 from the official OEM PDF datasheet. Contractual data must always match the specific OEM PDF revision used on the project.

Official datasheet (PDF)

Lenntech datasheet mirror