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Industrial RO Water Purify 8040 Reverse Osmosis Membrane

Water treated by desalination membranes removes most of the inorganic salts, organic matter and microorganisms. The design is directly related to the investment cost of the project, the economic efficiency of the whole system, the service life and the reliability and simplicity of the operation.

Brief Introduction

Desalination membranes are widely used in seawater desalination and high concentration brackish water desalination systems to produce various industrial and domestic water uses such as boiler make-up water for power plants. Desalination membranes are suitable for the feed of seawater and highly concentrated brackish water, especially for seawater and highly concentrated brackish water desalination systems with strict pre-treatment such as UF/MF.

Specifications and Major Properties


Average Permeated Flow GPD (m3/d)

Stable Rejection Rate (%)

Minimum Rejection Rate (%)

IWL 21-8040 10000(37.8) 99.5 99.2
IML 22-8040 1 1000(41.5) 99.5 99.2
IWL 21-4040 2500(9.4) 99.5 99.2

Testing Conditions:

Testing Pressure: 225 psi (1.55Mpa)

Temperature of Testing Solution: 25°C

Concentration of Testing Solution (NaCl): 2000ppm

pH Value of Testing Solution: 7.5

Recovery Rate of Single Membrane Element: 15%

Extreme Operation Conditions

Max. Working Pressure: 600psi(4. 14Mpa)

Max. Feedwater Flow: 75gpm(17 m3/h) (8040)

16gpm (3.6 m3/h) (4040)

Max. Feedwater T emperature: 45°C

Max. Feedwater SDI: 5

Residual chlorine Concentration of Feedwater: < 0.1ppm

pH Range of Feedwater during Continuous Operation: 3~10

pH Range of Feedwater during Chemical Cleaning: 2~12

Max. Pressure Drop of Single Membrane Element: 15psi(0.1Mpa)

Dimensions of Membrane Element

All dimensions are shown in: millimeter (inch)

Dimensions of Membrane Element (1)

Dimensions of Membrane Element (2)

Key points of reverse osmosis membrane installation

1. Before installing the membrane element, ensure that the system has been cleaned.

2. When installing the membrane element into the system, properly lubricate the O-ring and concentrated water seal, either with a silicone-based adhesive or a 50% aqueous solution of glycerin, prohibiting the use of oil, grease, petroleum jelly or petroleum-based compounds.

3. When installing the Dow reverse osmosis membrane into the pressure vessel one by one, eliminate the gap at the end plate of the pressure vessel by adding a gasket to prevent the membrane element from leaping in the pressure vessel when the system starts and stops, and to reduce the possibility of leakage at the outer connection of the membrane element.