Reverse osmosis system of calcium sulfate how to clean?

According to the analysis, the deposition of calcium sulfate typically occurs in three distinct stages. Initially, regardless of the influent concentration, the sedimentation rate starts from zero and gradually increases. In the second stage, as the influent concentration rises, there is a noticeable acceleration in the sedimentation rate during the middle phase of pollution. Finally, after this accelerated phase, the deposition rate stabilizes, indicating that the system has reached a new equilibrium. To address calcium sulfate fouling in reverse osmosis systems, several cleaning methods can be employed, including hydraulic cleaning, chemical cleaning, or a combination of both. Hydraulic flushing is often used first to remove the concentrated polarization layer on the membrane surface, which helps reduce initial fouling. It is particularly effective in cases where high concentrations of calcium sulfate cause rapid pollution, as it allows for quicker recovery and better performance restoration. However, when the fouling is slow and low in concentration, the effectiveness of hydraulic flushing diminishes, making it less efficient in such scenarios. In contrast, chemical cleaning plays a crucial role in restoring membrane performance, especially when physical methods alone are insufficient. For cases involving high-concentration calcium sulfate, chemical cleaning tends to be more effective and thorough. This is because the crystals formed under high-concentration conditions are irregular in shape and less chemically stable, making them easier to dissolve and remove. On the other hand, slow-growing calcium sulfate crystals tend to be more regular in structure and chemically stable, which makes them harder to eliminate through chemical means. Therefore, timely chemical cleaning is essential for preventing irreversible damage to the reverse osmosis system. If calcium sulfate scaling is left untreated, it can lead to long-term performance degradation and even membrane failure. Implementing an appropriate cleaning strategy—especially early in the fouling process—can significantly improve system efficiency and extend the lifespan of the membrane elements.

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