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Middle East Dow RO Membrane Replacement Projects
Time: Nov. 2020
Water Output: 20,000 m3/d
Background

In the water treatment field, reverse osmosis (RO) membrane technology is widely acclaimed for its efficient water purification capabilities, particularly in applications such as seawater desalination, wastewater treatment, and the production of purified water. As a company specializing in the production of high-quality RO membranes, we continuously strive for technological innovation and cost optimization to meet the needs of our global clientele. This case illustrates our successful collaboration with a Middle Eastern customer who sought a solution that could replace DuPont RO membranes without compromising the efficiency of equipment operation and water quality, ultimately choosing our product.

Before the transaction, the customer was highly reliant on DuPont's RO membranes, but the high costs were a significant burden. Our team conducted an in-depth analysis of the customer's needs and the configuration of their existing water treatment systems, recommending our RO membrane as a substitute.

An overview of RO membrane projects.
Related Products
Membrane Models – SM SW-8040-400HRLE

Snowate SW-8040-400HRLE/34 is a high-end seawater membrane featuring a supporting layer with high compression resistance, thick and dense flawless thin film layer. It has good wear resistance and chemical cleaning resistance. The membrane element does not require postprocessing during manufacturing. It tolerates a wide range of pH, which allows more efficient and rougher cleaning using regular acid and base, so it has a high cleaning efficiency. The membrane system can operate in the long term under lower pressure due to thorough cleaning, so the membrane performs better during its service life. It can significantly reduce operation costs and provide the best long-term economy for the seawater desalination system.

  • Superior high fouling resistance and suitable for poor feed water quality
  • Stable and high rejection rate of salts
  • High compression and fouling resistance and high cleaning efficiency
  • Low power consumption and reduced costs of the membrane system
Product Dimensions
A dimension drawing of SM SW-8040-400HRLE/34.
A B C D
Inch (mm) Inch (mm) Inch (mm) Inch (mm)
40 (1,016) / 1.125 (29) 7.9 (201)
Product Specifications
Model Performance Specification Structural Specification Test Conditions
Stabilized Salt Rejection Rate (%) Boron Rejection Rate (%) Flux
gpd (m3/d)
Active Area
ft2 (m2)
Feed Spacer Thickness (mill) Central Tube I.D. (mm)
SM SW-8040-400HRLE/34 99.8% 95.0% 8500 (33) 400 (37) 34 29 32,000 mg/L NaCl
800 psi, 25 °C
PH 7.8–8.2, Recovery 8%
Operating and cleaning limits
  • Maximum Operating Pressure: 83 bar (1200 psi)
  • pH Range Short-Term Cleaning: 1–13
  • Maximum Operating Temperature: 45 °C (113 °F)
  • Maximum Feed SDI (SDI 15): 5.0
  • Maximum Element Pressure Drop: 1.0 bar (15 psi)
  • Free Chlorine Tolerance: <0.1 ppm
  • pH Range Continuous Operation: 2–11
Notes
  • Permeate flow for individual elements may vary ±15% from the value specified.
  • Active membrane area guaranteed ±4%.
  • Stabilized salt rejection is generally achieved within 24–48 hours of continuous use; depending upon feed water characteristics and operating conditions.
Feedback

Through a year of follow-up investigation and repeated testing, we demonstrated that our membrane's performance closely matches that of DuPont's, fully meeting the customer's expectations. This not only helped the customer achieve significant cost savings but also ensured the efficient and stable operation of their water treatment systems.

  • The salt rejection rate of product was 99.02% in the first week of operation, and after 24 months of operation, the salt rejection rate of the system was stabilized at 98.15% – 98.22%.
  • Up to now, the salt rejection rate and flux of the system are stable.
  • In March 2023, 4,000 seawater desalination membrane elements were purchased and all have been replaced.
  • In November 2023, 4,100 seawater desalination membranes were purchased again.
Performance Comparison Between Snowate SW-8040-400HRLE and DuPont SW30HRLE-400 at Different Temperature
Test Conditions
Test Solutions NaCl Pressure 5.5 MPa
Concentrate 32,000 ppm pH 7.82
Performance Comparison Between Snowate & DuPont at Different Temperature
Temperature - 15 20 25 30
Salt Rejection Rate, % SW-8040-400HRLE 99.79% 99.76% 99.70% 99.66%
SW30HRLE-400 99.80% 99.77% 99.72% 99.67%
Flux, m3/h SW-8040-400HRLE 1.18 1.17 1.12 1.08
SW30HRLE-400 1.20 1.17 1.12 1.08
Conclusion: Under the same test conditions, the salt rejection rate and flux are close to each other
Performance Comparison Between Snowate SW-8040-400HRLE and DuPont SW30HRLE-400 at Different Concentration
Test Conditions
Test Solutions NaCl Pressure 5.5 MPa
Temperature 25 °C pH 7.82
Performance Comparison Between Snowate & DuPont at Different Concentration
Concentration, ppm - 23,800 28,800 31,200 33,150 35,300 36,800 38,900
Salt Rejection Rate, % SW-8040-400HRLE 99.83% 99.79% 99.75% 99.70% 99.64% 99.57% 99.49%
SW30HRLE-400 99.86% 99.81% 99.77% 99.71% 99.65% 99.59% 99.49%
Flux, m3/h SW-8040-400HRLE 1.74 1.42 1.26 1.1 0.91 0.78 0.67
SW30HRLE-400 1.86 1.49 1.24 1.11 0.93 0.8 0.68
Conclusion: Under the same test conditions, the rejection and flux are close to each other at different concentrations.
Test Report