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The Role Of Ion Exchange Resin In Sewage Treatment

Jul 18, 2020

Sewage treatment and remediation is an important task for our country, and it is also a long-term task. Among the sewage treatment materials, there is one called ion exchange resin, which has its unique properties and also plays a key role in sewage treatment. Then the ion exchange resin manufacturers will talk to you about its role in sewage treatment.

   1. Fouling and treatment of suspended matter

  The suspended matter in the raw water will block the pores in the resin layer, thereby increasing its water flow resistance, increasing the operating pressure drop, and covering the surface of the resin particles, thereby reducing the resin's working exchange capacity. In order to prevent the fouling of suspended matter, it is mainly to strengthen the pretreatment of raw water to reduce the content of suspended matter in the water. In order to remove the suspended matter accumulated in the resin layer, methods such as increasing the number and time of backwashing or scrubbing with compressed air can be used.

   2. Iron pollution and treatment

   Both yang and anion resins may cause iron contamination. The appearance of the contaminated resin is dark brown, and can turn black in severe cases. Generally, when the iron content in every 100g of resin exceeds 150mg, it should be treated. The presence of iron will accelerate the degradation of the anion resin.

   3. Pollution and treatment of calcium sulfate

When using sulfuric acid to regenerate calcium cation resin, if the concentration of the regeneration solution is too high or the flow rate is too slow, near the resin particles, the concentration of regenerated Ca2+ and SO42- in the solution exceeds the solubility product of CaSO4, and CaSO4 precipitation will occur. , And attached to the resin particles, not only is difficult to clean after regeneration, there is always hardness in the eluate, which affects the progress of the ion exchange reaction, and it will dissolve in the effluent during operation, increasing the hardness content and reducing the exchange capacity of the cation bed.

   Fourth, silicon pollution and treatment

   Silicon compound pollution occurs in strong base anion exchangers, especially in equipment and systems where strong and weak anion resins are combined. As a result, the silicon removal efficiency of the anion exchanger often decreases.

   5. Oil pollution and treatment

  The pollution of mineral oil to the resin is mainly adsorbed on the skeleton or coated on the surface of the resin particles, causing the fouling of the resin micropores, resulting in a reduction in resin exchange capacity and a significant reduction in the amount of water produced in cycles.