Ion-exchange process technique of hexavalent chrome-containing waste water

Abstract

The invention discloses an ion exchange treatment technology of wastewater containing hexavalent chromium, the ion exchange treatment technology combines the regulation of pH value of the wastewater, the absorption, the regeneration, the maintenance and the recovery of Cr<6+> ions, thereby realizing the automatic treatment of the Cr<6+> ions in the wastewater containing the chromium; the technology of the invention has high degree of automation and good treatment effect and can be applied in the large-scale water treatment; chromium removing columns are designed to three columns or multiple columns, intermediate tanks which can regulate the pH value are arranged among various ion exchange columns, when two columns or multiple columns are connected in series for working, the pH value can be regulated during the intermediate process, thereby ensuring the wastewater treatment effect to be better and being capable of overcoming the problem that the pH is changed due to the change of the concentration of the ions during the conventional ion exchange process, thereby causing the decrease of the absorption ability of the ions by the resin; the outlet water quality can stably maintain the Cr<6+> to be less than 0.5mg/L; ion exchange resin can be effectively maintained and be stably worked for a long time; regenerated liquid can be recovered, thereby saving resources.

Description

technical field [0001] The invention relates to a wastewater treatment process, in particular to an ion exchange treatment process for wastewater containing hexavalent chromium. Background technique [0002] Wastewater containing hexavalent chromium widely exists in the fields of electroplating and metallurgical production, which not only causes the loss of resources, but also causes serious environmental pollution. Therefore, the discharge of wastewater containing hexavalent chromium is strictly controlled. Ion exchange method is one of the effective methods to treat chromium-containing wastewater. Compared with other treatment methods, it has the advantages of low treatment cost and recyclable hexavalent chromium. However, the current treatment system and process have low degree of automation, resin regeneration and maintenance operations. Complex, not suitable for large-scale wastewater treatment, especially the presence of trivalent chromium in the wastewater, the serio...

AI Technical Summary

Problems solved by technology

Ion exchange method is one of the effective methods to treat chromium-containing wastewater. Compared with other treatment methods, it has the advantages of low treatment cost and recyclable hexavalent chromium. However, the current treatment system and process have low degree of automation, resin regeneration and maintenance operations. Complex, not suitable for large-scale wastewater treatment, especially the existence of trivalent chromium in wastewater, the serious pollution of resin has no effective solution

Therefore, the treatment of chromium-containing wastewater by ion exchange cannot be widely and large-scale applied at present.

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