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RO membrane Daltonen

Common Pollutants in Reverse Osmosis Membrane and Effective Removal Methods


Reverse osmosis (RO) membranes are widely used for water purification, but they are susceptible to various pollutants that can hinder their performance. Efficient removal methods are crucial to maintain the integrity and functionality of the RO membrane. In this article, we will explore common pollutants encountered in RO systems and detail effective removal strategies.

1. Calcium Carbonate Scale:

Issue: Deposition of calcium carbonate due to system failures or pH imbalances.

Removal Method: Early detection is key; adjust feedwater pH to 3.0-5.0 for 1-2 hours. For longer settling times, use RT-818A cleaning solution for cyclic cleaning or overnight soaking.

Note: Maintain cleaning solution pH between 2.0 and 11.0; use ammonia to increase pH and sulfuric acid or hydrochloric acid to lower it.

2. Calcium Sulfate Scale:

Removal Method: Utilize specialized cleaning agents for effective removal from the membrane surface.

3. Metal Oxide Scale:

Removal Method: Employ the same method used for calcium carbonate scale to eliminate deposited hydroxides, such as ferric hydroxide.

4. Silica Scale:

Removal Method: For silica scales not symbiotic with metallization or organic matter, employ special cleaning methods; contact the company for detailed procedures.

5. Organic Deposits:

Removal Method: Use cleaning agents for organic deposits like microbial slime. Follow up with a sterilizing solution to prevent reproduction; consult the company for suitable fungicides.

6. Cleaning Solution:

Recommended: Use RO membrane system cleaning agents and conduct a chemical analysis of pollutants before cleaning. Record cleaning methods and results for future reference.

Guidelines: Cleaning at a maximum temperature of 40 degrees Celsius for 60 minutes; proportions calculated per 100 gallons. Circulate the cleaning solution on the high-pressure side with a special cleaning device.

General Steps for Cleaning RO Membrane Elements:

  1. Pump clean, chlorine-free product water into the pressure vessel and drain for a few minutes.

  2. Prepare a clean liquid in a designated box with clean product water.

  3. Circulate the cleaning fluid in the pressure vessel for 1 hour or a preset time, adjusting flow rates based on pressure vessel size.

  4. Drain and rinse the cleaning tank, then fill it with clean product water for the next flush.

  5. Pump clean, chlorine-free product water into the pressure vessel and drain for a few minutes.

  6. After flushing the RO system, run it with the product water discharge valve open until the water is clean, free of foam or cleaning agents (usually 15 to 30 minutes).


By following these guidelines, RO system operators can effectively manage and optimize the performance of their membrane elements, ensuring clean and efficient water purification.

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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