Coal Engineering ›› 2024, Vol. 56 ›› Issue (12): 19-25.doi: 10.11799/ce202412004

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Based on the change of pH and salt content, the change rule of hard and silicon removal in high salt wastewater was studied.

  

  • Received:2024-03-18 Revised:2024-06-26 Online:2024-12-20 Published:2025-01-08

Abstract: In order to remove calcium, magnesium ions and silicon dioxide in high-salt wastewater and reduce the impact on the subsequent membrane process and evaporation process, the effects of salt content, reaction pH, and removal of calcium, magnesium ions and silicon dioxide in high-salt wastewater were studied. The results show that when sodium carbonate and magnesium chloride are added, the pH has a significant effect on the reaction of removing hardness and silicon, and when the pH is greater than or equal to 11, the calcium, magnesium and silicon can be reduced to a lower level simultaneously. In addition, when sodium carbonate and magnesium chloride were added, the removal rate of calcium, magnesium and silicon ions gradually decreased with the increase of salt content. Even if the pH was increased, the removal rate of ions could not be greatly improved, especially the removal of calcium ions.