Dairy HWS series

Summary

Product Identification

Veolia introduces the Dairy HWS family of reverse osmosis (RO) and nanofiltration (NF) elements, designed for hot water sanitization (pasteurization) in dairy applications. These elements are suitable for applications with biologically active feeds, allowing sanitization by periodic exposure to temperatures up to 90°C (194°F) without risking membrane damage.

Key features and benefits:

• Sanitization without ineffective or harmful chemicals.
• Protection against detrimental bacterial growth on the membrane surface.
• Utilizes polysulfone parts and unique element construction.
• Comprised of high quality materials that meet 3A standards and conform to guidelines set by the Code of Federal Regulations.
• Features a patented Durasan* Cage protective sleeve for enhanced element integrity and improved sanitizing effectiveness.

Dairy HWS elements comply with:

• FDA Regulations relevant sections of 21CFR
• EU Framework 1935/2004/EC
• Halal & Kosher certification

Dairy HWS elements enable the concentration of:

• Sweet Whey
• Lactose
• Whole Milk
• Skim Milk

Element Specifications

Membrane Type: Thin-film membrane (TFM*)

• Dairy HWS RO3840C30
  • Spacer: 30 mil (0.76 mm)
  • Active area: 77 ft² (7.2 m²)
  • Part number: 1228223
• Dairy HWS RO8038C30
  • Spacer: 30 mil (0.76 mm)
  • Active area: 372 ft² (34.6 m²)
  • Part number: 1206651
• Dairy HWS NF3838C50 HR
  • Spacer: 50 mil (1.27 mm)
  • Active area: 55 ft² (5.1 m²)
  • Part number: 1240430
• Dairy HWS NF3838C65 HR
  • Spacer: 65 mil (1.65 mm)
  • Active area: 48 ft² (4.5 m²)
  • Part number: 3167046
• Dairy HWS NF3840C30 HR
  • Spacer: 30 mil (0.76 mm)
  • Active area: 77 ft² (7.2 m²)
  • Part number: 1232322
• Dairy HWS NF8038C50
  • Spacer: 50 mil (1.27 mm)
  • Active area: 282 ft² (26.2 m²)
  • Part number: 3002372

Mechanical / Hydraulic

Dimensions and Weight

• Model 3838C
  • A: 38.00 inches (96.5 cm)
  • B: 0.833 inches (2.12 cm)
  • C: 3.8 inches (9.6 cm)
  • Boxed Weight: 7 lbs. (3.2 kg)
• Model 3840C
  • A: 38.75 inches (98.4 cm)
  • B: 0.833 inches (2.12 cm)
  • C: 3.8 inches (9.6 cm)
  • Boxed Weight: 7 lbs. (3.2 kg)
• Model 8038C
  • A: 38.00 inches (96.52 cm)
  • B: 1.125 inches (2.86 cm)
  • C: 7.91 inches (20.1 cm)
  • Boxed Weight: 29 lbs. (13.2 kg)

Operating Limits

• Do not exceed 20 GFD (33 LMH) or 2,000 Wagner units under any circumstance.
• Typical Operating Pressure: 200-500 psi (1,379-3,447 kPa)
• Typical Operating Flux: 5-20 GFD (8–34 LMH)
• Clean Water Flux (CWF):
  • RO: 14 GFD (24 LMH) @ 225 psi
  • NF: 14 GFD (24 LMH) @ 110 psi
  • Note: CWF can vary ±25%.
• Maximum Operating Pressure: 600 psi (4,137 kPa) at 41 – 122°F (26 – 50°C)
• Maximum Temperature:
  • Continuous operation: 122°F (50°C)
  • Hot Water Sanitization: 194°F (90°C)
• pH Range:
  • RO elements: 2.0 – 11.0
  • NF elements: 3.0 – 9.0
• Chlorine Tolerance: 500+ ppm hours, dechlorination recommended
• Maximum Pressure Drop:
  • Over an element: 15 psi (103 kPa)
  • Per housing: 60 psi (414 kPa)

Cleaning In Place (CIP) Limits

RO elements:

• Temperature 50°C (122°F): pH minimum 2.0, pH maximum 11.5
• Temperature 45°C (113°F): pH minimum 1.5, pH maximum 11.5
• Temperature 35°C (95°F): pH minimum 1.5, pH maximum 11.5
• Temperature 25°C (77°F): pH minimum 1.0, pH maximum 12.0

NF elements:

• Temperature 50°C (122°F): pH minimum 3.0, pH maximum 10.0
• Temperature 45°C (113°F): pH minimum 2.0, pH maximum 10.5
• Temperature 35°C (95°F): pH minimum 1.5, pH maximum 11.5
• Temperature 25°C (77°F): pH minimum 1.0, pH maximum 11.5

Hot Water Sanitization Recommendations

Initial Setup:

• Prior to first use, new elements must be flushed with clean water (RO permeate preferred) for at least an hour at a transmembrane pressure of not more than 45 psi (3 bar).
• The system must operate for a minimum of 24 hours before hot water sanitization.
• If new elements are to be hot water sanitized before first use, flush the system at low transmembrane pressure (up to 45 psi / 3 bar) for a minimum of 24 hours prior to sanitization.

Sanitization Procedure:

1. Clean elements with an approved Clean In Place (CIP) procedure and thoroughly flush for at least an hour before sanitization.
2. Increase system temperature from room temperature to the target sanitization temperature (up to 90°C/194°F) at a rate not higher than 5°C/9°F per minute. Maintain the target temperature for 30 to 60 minutes.
3. Cool the system to room temperature at a rate not higher than 5°C/9°F per minute.

During Sanitization:

• Transmembrane pressure during hot water sanitization should be maintained as low as possible, not exceeding 45 psi (3 bar), while ensuring some permeate flow.
• Monitor and adjust cross-flow so that the pressure drop is not more than 2 psi per element or 10 psi per housing.

Note on Permeate Flow Loss: Repeated 90°C sanitization cycles can lead to a loss of permeate flow rate, which depends on factors like temperature change rates, presence of other species, feed flow rate, and spacer thickness. In controlled environments with deionized water, 30% to 50% of the original permeate flow rate was lost before performance stabilized after repeated heat treatments (over 90% of this reduction occurred during the first treatment). With permeate flow rate loss, salt rejection increases. Pilot testing is recommended to determine optimal operating parameters for specific applications.

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Disclaimer: This summary is based on the provided text extract. It may not include all figures, footnotes, or the latest revisions found in the official OEM PDF datasheet. For contractual data, always refer to the specific OEM PDF revision used on the project.

Official datasheet (PDF)

PDF datasheet