X-Flow-HFS60

Summary

Product identification

The X-flow HFS 60 is a tight ultrafiltration module (membrane element datasheet: 8” HFS 60 PVC 0.8mm) designed for the removal of colloidal silica from surface water. This module can be used in vertical and horizontal configurations, with operation modes including feed-and-bleed (with minor crossflow) or dead-end (with regular backwash, forward flush, and chemically enhanced backwash).

• Article Code: 23E1DN2KEH
• Membrane type: Hydrophilic membrane composed of a blend of modified polyethersulfone and polyethersulfone
• Structure: Asymmetric/microporous
• Molecular Weight Cut-Off (MWCO): 10 kDa on dextranes
• Key features: High performance and very good anti-fouling behavior, designed for silica retention.

Mechanical / hydraulic

Element Specifications

• Membrane Diameter: 0.8 mm (31 mil)
• Membrane Area: 60 m² (645 ft²)
• Feed connection D0: 220.0 mm (8.66 Inch)
• Element Length L0: 1537.5 mm (60.51 Inch)
• Permeate connection d0: 42.6 mm (1.68 Inch)

Weight Specifications

• Dry weight of membrane element: ca. 34 kg (75 lbs)
• Membrane element filled with water: ca. 66 kg (145 lbs)
• For vertical dead-end pressurized configuration:
  • Pressure housing, empty: ca. 20 kg (44 lbs)
  • Housing, including element: ca. 54 kg (119 lbs)
  • Housing, including element and water filled: ca. 100 kg (220 lbs)

Materials of Construction

• Housing: PVC white
• Flow distributor: PVC/PP
• Potting: PU resin
• Membrane: PES/modPES

Hydraulic Process Characteristics (water, 20 °C)

• Membrane diameter: 0.8 mm (31 mil)
• Crossflow flow rate: 30 x v (40 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)

Operating limits

• Max. feed pressure: 300 kPa (43 psi)
• Max. backflush pressure: 450 kPa (65 psi)
• Temperature range: 10-40 °C (50-104 °F)
• pH during filtration: > 2 to < 12
• pH during cleaning: > 1 to < 13
• Temperature changes: Do not subject to sudden temperature changes, particularly decreases. Bring to ambient operating temperature slowly (max. 3 °C/min).

Product water

• Typical permeate quality: SDI<3, turbidity <0.1 NTU
• Silica retention: Typical > 99.8% for colloidal silica (tested on surface water containing 10 mg/l total silica and 1 mg/l colloidal silica).

Cleaning 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: ++

Specific Cleaning Chemical Resistance

• Acids:
  • Hydrochloric Acid: ++
  • Nitric Acid: ++
  • Sulphuric Acid: ++
  • Phosphoric Acid: ++
  • Acetic Acid: ++
  • Citric Acid: ++
• Bases:
  • Sodium Hydroxide (<4%): ++
  • Potassium Hydroxide (<4%): ++

Oxidant Contact Limits

These figures represent resistance to each individual oxidizing agent.

• 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:
  • 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.
• Guidance: Reduce membrane exposure to oxidizing agents to a minimum. Exposure limits are affected by temperature, pH, and the presence of metals. Membranes must be preserved free of any oxidizing agent when the plant is stopped.

Backwash Recommendations

• Backwash water should be free of particulates and of permeate quality or better.
• Backwash pumps should preferably be made of non-corroding materials (e.g., plastic or stainless steel).
• If compressed air is used, do not allow a two-phase air/water mixture to enter the element.

Certifications

• USA: ANSI/NSF, Standard 61
• The Netherlands: KIWA ATA
• UK: DWI Regulation 31
• France: ACS

Storage

• New membrane modules: Stored as supplied in original packaging. Elements contain an aqueous preservation solution of glycerine (20 wt%) and sodium metabisulfite (1 wt%).
• Storage conditions: Dry, normally ventilated place, away from heat, ignition, and direct sunlight. Store between 0 and 40 °C. Do not subject to freezing temperatures.
• Shelf life: Maximum 6 months for unused modules in unopened packaging under correct storage conditions.
• After use: Membrane modules must be stored wet at all times.
• Biological growth control:
  • Short-term shutdowns (1-7 days): A daily backwash with permeate quality water for 30 seconds at 250 lmh should be adequate. Modules must be cleaned by a standard Chemical Enhanced Backwash (CEB) before the shutdown.
  • 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 situations, modules should remain filled with storage solution.

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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