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CPA3-LD RO element

Comprehensive Guide: FAQs about Reverse Osmosis Membrane & Ion Exchange Resin(1)

Answers to Common Questions about Reverse Osmosis Membrane and Ion Exchange Resin (11-20)

11. Why is the pH value of RO product water lower than the pH value of the feed water?

Understanding the intricate balance between CO2, HCO3-, and CO3= sheds light on this phenomenon. While RO membranes effectively remove soluble ions, they cannot eliminate soluble gases like CO2. Consequently, the content of HCO3- and CO3= in RO product water decreases significantly, disrupting the pH balance. This often leads to a drop in the pH of the product water by 1 to 2 pH values.

12. How do you know which cleaning method should be used to clean your membrane system?

Choosing the right cleaning agents and procedures is vital for optimal cleaning. Typically, acidic cleaning fluids are recommended for inorganic scale contaminants, while alkaline solutions are suitable for microorganisms or organic pollutants.

13. Which cleaning agent supplier is recommended by the membrane supplier?

While we do not endorse specific cleaning agent suppliers, we offer guidance on common cleaning solutions and compatibility testing on our website or in manuals.

14. How to find out which membrane elements need to be replaced?

Abnormal increases in salt content (conductivity) indicate potential membrane element defects or leaks. Systematic diagnosis through sampling ports and conductivity testing helps pinpoint faulty components for replacement.

15. When using ROSA software, why is there an error message that “the calculation cannot be completed in 200 iterations”?

Ensure that your computer settings match the decimal point format used by the ROSA software. Adjust settings from Start → Settings → Control Panel → Regional Settings → Number to resolve this issue.

16. When will the ROSA software be upgraded in the future?

Stay informed about ROSA software upgrades to access the latest features and enhancements.

17. Does Dow have a membrane analysis service?

Yes, Dow offers the DIRECTOR Service for membrane analysis. Visit the Dow Liquid Separation Department website for details.

18. How to apply membrane to new fields?

For novel applications, conducting feasibility tests and collaborating with membrane system suppliers and research institutes can facilitate successful implementation and scale-up design.

19. Should degassing devices be installed between the first and second stage RO?

Degassing devices may be necessary for special requirements or water compositions, particularly to reduce CO2 or H2S content. Vacuum degassing is recommended for situations involving H2S or airborne dust pollution.

20. How to wash away iron pollution?

Sodium bisulfite proves to be the most effective method for cleaning iron pollution.

Xi’an CHIWATEC Water Treatment Technology provide the RO membrane to clients both inland and oversea with more than 10years experience. We manufacture our own brand Daltonen RO membrane and we are also the official distributor of Dupont, Toray, CSM, Nitto, LG and Vontron RO membrane. Whatever product you need, we cold meet your requirement.

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