TREATMENT OF ION EXCHANGE REGENERATED WASTE LIQUID AND DEVICE THEREFOR

摘要

PROBLEM TO BE SOLVED: To provide a method of treating ion exchange resin regenerated waste liquid and a device therefor by which method regenerated waste liquid generated in a regenerating process of ion exchange resin by hydrochloric acid and caustic soda can be effectively treated to lower treating cost. SOLUTION: Regenerated waste liquid is passed through an electrodialysis device 22 using a bipolar membrane to separate hydrochloric acid and caustic soda therefrom. Electrodialysis treated water from which hydrochloric acid and caustic soda have been separated and removed is led to a flocculating and settling tank 23 to flocculate and deposit eluted materials from resin contained therein, and the water subjected to flocculation and settling which is supernatant is neutralized and is brought out as treated water. The separated hydrochloric acid and caustic soda are reused for regeneration of ion exchange resin and the pH adjustment in the flocculating and settling tank 23.