Product details of the reverse osmosis membrane filter
Quick Overview
DUBHE reverse osmosis membrane filter is designed to be operated in a high efficiency manner. The product is of the highest levels of safety and quality. Without consideration of the DUBHE staff, reverse osmosis membrane filter can not be produced to be so excellent.
Product Description
We value the quality of our products. And we strive for perfection in every detail of products. In this way, we guarantee the fine quality of our products.
Reverse Osmosis Technology Introduction
Osmosis and Reverse OsmosisOsmosis is a natural process in which water (the solvent) spontaneously passes through a semipermeable membrane from a solution of lower concentration to a solution of higher concentration, ultimately achieving a dynamic equilibrium of solute concentration on both sides of the membrane.
Reverse osmosis is a process where water flows in the opposite direction of natural osmosis—from the concentrated solution to the dilute solution. This process must be achieved by applying external pressure. The osmotic pressure on both sides of the semi-permeable membrane, the internal resistance of the membrane itself, and the resistance formed on the membrane surface and inside its pores due to fouling during operation collectively hinder the reverse flow of water. Therefore, the applied pressure in reverse osmosis must significantly exceed the osmotic pressure difference of the solution itself.
Reverse Osmosis Membrane(RO/NF)Reverse osmosis systems must rely on reverse osmosis membranes (i.e., the semi-permeable membranes mentioned above) to achieve the separation of solutes and solvents. Reverse osmosis membranes allow the solvent to pass through while retaining other solutes. Currently, the vast majority of reverse osmosis membranes are multi-layer composite polymer structures with a polyamide-based separation layer. These membranes provide excellent separation performance and durability under conventional feed water conditions.
Membrane Element Product Series
|
Product name |
Applications | Model number |
| Extremely Low-Pressure RO Membrane Elements | Energy-Saving Type: Suitable for the purification of surface water, such as municipal tap water and river water. | XLP8040/4040 |
| Ultra-Low-Pressure (ULP) RO Membrane Elements | Desalination Type: For the desalination and purification of municipal tap water, river water, and other surface water sources. | ULP8040/4040 |
| Low-Pressure (LP) RO Membrane Elements | Brackish Water Type: Designed for municipal water desalination, electronics-grade ultrapure water production, boiler feed water treatment, and reclaimed water reuse. | LP8040/4040 |
| Medium/High-Pressure RO Membranes | Brackish Water Type: Applicable to pure water production, brackish water desalination, groundwater desalination, as well as reclaimed water reuse and advanced treatment. | BW8040/4040 |
| Fouling-Resistant RO Membrane Elements | Fouling-Resistant Coating: Used for the advanced purification of municipal water, industrial wastewater, and slightly polluted surface water or groundwater. | FR8040 |
| Seawater Desalination | High-Salinity Type: Suitable for the desalination or further concentration of seawater, brine, high-salinity industrial wastewater, reclaimed water, and RO/NF concentrate with a TDS ≥ 10,000 mg/L. | SW8040/4040 |
| Product name | Applications | Model number |
| N40 Low-Salt-Rejection NF Membrane Element | Suitable for desalination and purification of municipal water, decolloration, desalination, concentration, and refinement of process streams. | N40-8040/4040 |
| N70 Medium-Salt-Rejection NF Membrane Element | Applied in zero liquid discharge (ZLD) and salt fractionation/resource recovery from high-salinity wastewater, as well as concentration and separation of process streams. | N70-8040/4040 |
| N90 High-Salt-Rejection NF Membrane Element | Suitable for municipal water softening, desalination, reclaimed water reuse, and separation/concentration of process streams. | N90-8040/4040 |
| NTX Nitrate-Removal NF Membrane Element | Suitable for ZLD and resource recovery from high-salinity industrial wastewater (e.g., chlor-alkali, textile dyeing, petrochemical, coal chemical). | NTX8040/4040 |
| N_HP High-Pressure Salt-Fractionation NF Membrane Element | Designed for ZLD and resource recovery from high-salinity industrial wastewater. | N70HP8040 NTXHP8040 |
Product Selection Guide
Model Description
RO Membrane Element Nomenclature
BW-8040-400
| BW | Element Type (RO Membrane) |
| 80 | Element Diameter (Unit: inch) |
| 40 | Element Length (Unit: inch) |
| 400 | Effective Element Area Unit: ft² |
NF Membrane Element Nomenclature
N70-8040/34i
| N70 | Element Type (NF Membrane) |
| 80 | Element Diameter (Unit: inch) |
| 40 | Element Length (Unit: inch) |
| 34i | Brine Spacer Thickness (Unit: mil) |
Product features
Optimization of the membrane element's structural design and spiral-winding technology enables superior hydrodynamic conditions during operation, resulting in enhanced performance. Validated through extensive engineering applications, Membrane Industry has developed spiral-wound element products with a more user-focused design.
● Optimized spacer thickness and structure create superior hydrodynamic conditions, enhancing the fouling resistance of the membrane element;
● High packing density of membrane leaves combined with uniform sealing technology promotes higher permeate flow and salt rejection rates;
● Increasing the number of membrane leaves reduces the permeate flow path length, thereby improving permeation efficiency;
● A fully automated, mechanized spiral-winding process ensures consistent product quality and stable performance;
● Dry membrane elements offer greater convenience for transportation and long-term storage.
Membrane Element Product Series
| Category | Model | Effective Area ft²/m³ | Stable Salt Rejection % | Standard Permeate Flow GPD/m³/d |
| Extremely Low-Pressure Energy-Saving Type | XLP-8040-440 | 440/40.8 | 98.5 | 9500/36.0 |
| XLP8040-400 | 400/37.2 | 98.5 | 8450/32.0 | |
| XLP-4040 | 98/9.1 | 98.5 | 2050/7.8 | |
| Extra-Low Pressure Desalination Type | ULP-8040-440 | 400/40.8 | 99.2 | 11880/45.0 |
| ULP-8040-400 | 400/37.2 | 99.2 | 10500/40.0 | |
| ULP-4040 | 98/9.1 | 99.2 | 2500/9.6 | |
| Low-Pressure Brackish Water Type | LP-8040-440 | 440/40.8 | 99.5 | 11880/45.0 |
| LP-8040-400 | 400/37.2 | 99.5 | 10500/40.0 | |
| LP-4040 | 95/8.8 | 99.5 | 2400/9.1 | |
| Medium/High-Pressure Brackish Water Type | BW-8040-440 | 440/40.8 | 99.6 | 11880/45.0 |
| BW-8040-400 | 400/37.2 | 99.6 | 10500/40.0 | |
| BWHP-8040-380 | 380/35.5 | 99.6 | 9500/36.0 | |
| BW-4040 | 95/8.8 | 99.6 | 2400/9.1 | |
| Gen-2 Enhanced Anti-Fouling Type | LFRⅡ-8040-400 | 400/37.2 | 99.5 | 10000/38.0 |
| BFRⅡ-8040-400 | 400/37.2 | 99.6 | 10000/38.0 | |
| Seawater Desalination Type | SW-8040-400 | 400/37.2 | 99.7 | 7600/28.8 |
| SW-8040-380 | 380/35.3 | 99.7 | 6850/26.0 | |
| SW-4040 | 92/8.5 | 99.7 | 1700/6.5 |
| Category | Model | Effective Area ft²/m³ | Stable Salt Rejection % | Standard Permeate Flow GPD/m³/d | |
| MgSO₄ | NaCl | ||||
| Low-Salt-Rejection NF | N40-8040/28i | 440/40.8 | 96.0 | 20-55 | 11100/42.0 |
| N40-8040/34i | 400/37.2 | 96.0 | 20-55 | 10000/38.0 | |
| N40-8040/36i | 380/35.3 | 96.0 | 20-55 | 9250/35.0 | |
| N40-4040 | 98/9.1 | 96.0 | 20-55 | 2400/9.2 | |
| Medium-Salt-Rejection NF | N70-8040/28i | 440/40.8 | 98.0 | 50-85 | 11100/42.0 |
| N70-8040/34i | 400/37.2 | 98.0 | 50-85 | 10000/38.0 | |
| N70-4040 | 95/8.8 | 98.0 | 50-85 | 2350/9.0 | |
| High-Salt-Rejection NF | N90-8040/28i | 440/40.8 | 99.2 | 85-95 | 11100/42.0 |
| N90-8040/34i | 400/37.2 | 99.2 | 85-95 | 10000/38.0 | |
| N90-4040 | 98/9.1 | 99.2 | 85-95 | 2350/9.0 | |
| Nitrate-Selective NF | NTX-8040/28i | 440/40.8 | 99.0 | 50-85 | 10000/38.0 |
| NTX-8040/34i | 400/37.2 | 99.0 | 50-85 | 9000/34.0 | |
| NTX-4040 | 95/8.8 | 99.0 | 50-85 | 2250/8.5 | |
| High-Pressure Salt-Fractionation NF | N70HP-8040/34i | 370/34.3 | 98.0 | 50-85 | 9000/34.0 |
| NTXHP-8040/34i | 370/34.3 | 99.0 | 50-85 | 7900/30.0 | |
Product Performance Parameters
Performance and Operating Parameters of Extremely Low Pressure (ELP) & Extra Low Pressure (XLP) RO Membrane Elements
| Type | Model | XLP-8040-440 | XLP-8040-400 | XLP-4040 | |
| Dimension | 8inch | 4inch | |||
| Membrane Material | Aromatic Polyamide | ||||
| Performance | Active Membrane Area | ㎡ | 40.8 | 37.2 | 9.1 |
| Ft² | 440 | 400 | 98 | ||
| Feed Spacer Thickness | mil | 28 | 34 | 28 | |
| mm | 0.711 | 0.864 | 0.711 | ||
| Salt Rejection % | Nominal | 98.5 | |||
| Minimum | 98.0 | ||||
| Permeate Flow | m³/d | 36.0 | 32.0 | 7.8 | |
| GPD | 9500 | 8450 | 2050 | ||
| Test Conditions |
NaCl Solution Concentration NaCl（mg/L) |
250±10 | |||
| Pressure psi(MPa) | 80（0.55) | ||||
| Temperature ℃ | 25.0±1.0 | ||||
| Single Element Recovery % | 15±1 | ||||
| Test Solution pH | 7-8 | ||||
| Operating Conditions | Maximum Feed Pressure psi(MPa) | 600(4.1) | |||
| Maximum Feed Flow gpm(m³/h) | 75(17.0) | 16(3.6) | |||
| Maximum Feed Temperature ℃ | 45 | ||||
| Continuous Operating pH Range pH | 3-10 | ||||
| Chemical Cleaning pH Range pH | 2-12 | ||||
| Maximum Feed Turbidity NTU | 1.0 | ||||
| Maximum Feed SDI 15 | 5 | ||||
| Maximum Feed Chlorine mg/L | 0.1 | ||||
| Maximum Pressure Drop psi(MPa) | 15(0.1) | ||||
Performance and Operating Parameters of Extremely Low Pressure (ELP) & Ultra Low Pressure (ULP) RO Membrane Elements
| Type | Model | ULP-8040-440 | ULP-8040-400 | ULP-4040 | |
| Dimension | 8inch | 4inch | |||
| Membrane Material | Aromatic Polyamide | ||||
| Performance | Active Membrane Area | ㎡ | 40.8 | 37.2 | 9.1 |
| Ft² | 440 | 400 | 98 | ||
| Feed Spacer Thickness | mil | 28 | 34 | 28 | |
| mm | 0.711 | 0.864 | 0.711 | ||
| Salt Rejection % | Nominal | 99.2 | |||
| Minimum | 98.8 | ||||
| Permeate Flow | m³/d | 45.0 | 40.0 | 9.6 | |
| GPD | 11880 | 10500 | 2500 | ||
| Test Condition | NaCI Solution Concentration NaCl（mg/L) | 500±20 | |||
| Pressure psi(MPa) | 100（0.70) | ||||
| Temperature ℃ | 25.0±1.0 | ||||
| Single Element Recovery % | 15±1 | ||||
| Test Solution pH | 7-8 | ||||
| Operating Conditions | Maximum Feed Pressure psi(MPa) | 600(4.1) | |||
| Maximum Feed Flow gpm(m³/h) | 75(17.0) | 16(3.6) | |||
| Maximum Feed Temperature ℃ | 45 | ||||
| Continuous Operating pH Range | 3-10 | ||||
| Chemical Cleaning pH Range | 2-12 | ||||
| Maximum Feed Turbidity NTU | 1.0 | ||||
| Maximum Feed SDI15 | 5 | ||||
| Maximum Feed Chlorine mg/L | 0.1 | ||||
| Maximum Pressure Drop psi(MPa) | 15(0.1) | ||||
Company Introduction
With first-rate technology equipped, DUBHE offers the reverse osmosis membrane filter with the highest quality. With high innovative research and development capabilities, Shanghai Dubhe Environmental Protection Technology Co.,Ltd has a large number of patented technologies. We have a key role to play in the reverse osmosis membrane filter industry shift towards sustainable development. We will lower our own carbon footprint and promise not to cause pollution to the environment.
You are always welcomed for inquiry.
+86-18019736003