Vontron NF 8040 Membrane

 

The Vontron NF 8040 nanofiltration membrane is designed for large-scale industrial water treatment systems requiring high permeate flow and stable separation performance.

Available in VNF1 and VNF2 models, it supports flexible operation for:

• Water softening
• Organic matter removal
• Partial desalination

Compared with 4040 elements, the 8040 size provides significantly higher output, making it suitable for centralized water treatment systems.

 

 

 

Model	Type	NaCl Rejection	MgSO₄ Rejection	Feature	Equivalent
VNF1	Low rejection	~40–60%	≥95%	High flux	NF270
VNF2	High rejection	~85–95%	≥98%	High purity	NF90

 

 

 

Parameter	Value
Membrane Type	Polyamide composite
Configuration	Spiral wound
Effective Area	~37.2 m²
Operating Pressure	0.3 – 0.8 MPa
Max Pressure	1.6 MPa
Max Temperature	45°C
pH Range (Operation)	3 – 10
pH Range (Cleaning)	1 – 13
Feed SDI	≤5

 

Operating Limits:

• Maximum Operating Pressure: 600 psi (4.14 MPa)
• Maximum Feed Flow: 8040-75 gpm (17 m³/h) | 4040-16 gpm (3.6 m³/h) | 2540-6 gpm (1.4 m³/h)
• Maximum Feed Temperature: 45 °C
• Maximum Feed SDI₁₅: 5
• Feed Free Chlorine Concentration: <0.1 mg/L
• Max. Pressure Drop per Element: 15 psi (0.1 MPa)
• Chemical Cleaning pH Range: 2 - 12
• Operating Feed pH Range: 3 - 10

 

 

 

High Permeate Flow: A large membrane area delivers higher output per element.
Energy-Efficient Operation: Lower pressure than RO systems reduces energy costs.
Flexible Separation Performance: VNF1 and VNF2 models meet different treatment needs.
Robust Structure: Suitable for continuous industrial operation.
Standard 8040 Design: Compatible with industrial 8040 membrane housings.

 

 

 

The performance of nanofiltration membranes depends heavily on precise manufacturing technology. Vontron NF membranes are produced through a controlled multi-step process:

 

1. Base Membrane Preparation: A microporous support layer is formed using phase inversion technology, providing mechanical strength and permeability.
2. Interfacial Polymerization: A thin polyamide selective layer is created on the membrane surface through interfacial polymerization, which determines the rejection performance.
3. Membrane Curing & Stabilization: The membrane is heat-treated and chemically stabilized to ensure consistent separation performance.
4. Element Rolling (Spiral Winding): Flat sheet membranes are wrapped around a central permeate tube to form spiral-wound elements (4040 / 8040).
5. Quality Testing: Each membrane element undergoes strict performance testing, including flux and rejection rate verification.
    

This controlled process ensures stable quality, reliable performance, and long service life in industrial applications.

 

 

 

 

Large-scale industrial water treatment systems

Boiler feed water pretreatment

Textile and dyeing industry

Food & beverage processing

Municipal water treatment

Pharmaceutical and chemical processing

 

 

 

Equivalent & Replacement

Vontron NF 8040 membranes can replace:

• NF270-8040 (VNF1-8040)
• NF90-8040 (VNF2-8040)

Fully compatible with standard 8040 pressure vessels, allowing easy system integration.

 

 

 

Q1: What is the difference between VNF1 and VNF2 membranes?
A: VNF1 is a low-rejection, high-flux membrane, suitable for applications requiring higher water output and partial desalination. VNF2 offers higher salt rejection and is used when better permeate quality is required. The selection depends on feed water quality and treatment goals.

 

Q2: What is the difference between 4040 and 8040 NF membranes?
A: The main differences lie in size and water production capacity. The 8040 membrane has a larger effective area (approximately 37 square meters) and a water production capacity of about 40 m³ per hour, typically used in large industrial systems. The 4040 membrane, on the other hand, is more suitable for small to medium-sized systems, with a water production capacity of approximately 8 m³ per hour.

 

Q3: Can Vontron NF membranes replace NF270 and NF90 directly?
A: Yes. VNF1 is designed as an equivalent to DuPont FilmTec NF270, and VNF2 corresponds to DuPont FilmTec NF90. Both are compatible with standard membrane housings and can be installed in existing systems without modification.

👉 Read this blog to see more infomations: Why Vontron NF Membrane Is a Smart Replacement

 

Q4: When should I choose nanofiltration (NF) instead of reverse osmosis (RO)?

A: NF is preferred when partial desalination or hardness removal is required. It operates at lower pressure and allows some monovalent salts to pass, making it more energy-efficient than RO in suitable applications.

 

Q5: What pretreatment is required for NF membranes?

A: Proper pretreatment is essential to ensure stable performance. Typically, feed water should have SDI ≤ 5, and suspended solids, chlorine, and scaling potential should be controlled through filtration, dechlorination, and antiscalant dosing if necessary.

 

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