System and method for reusing denitration catalyst regeneration wastewater in catalyst recovery process

[0034] Example

[0035] Such as figure 1 As shown, the system for reusing the denitrification catalyst regeneration wastewater in the catalyst recovery process in this embodiment mainly includes a coagulation sedimentation tank 1, a membrane concentration unit 2, a concentrated brine tank 3, a sodium sulfate electrolysis unit 4, and an evaporation crystallization unit 5.

[0036] The wastewater from the denitration catalyst pickling process section contains a certain amount of suspended solids, which are mainly ash residues and partially broken catalysts that have not been completely cleaned and removed in the previous steps. The pH value of the wastewater is about 1, and contains heavy metal ions such as vanadium and arsenic.

[0037] The pickling wastewater is discharged into the coagulation sedimentation tank 1, and a sodium hydroxide solution with a mass fraction of 40% is added through the sodium hydroxide dosing device to adjust the pH of the mixed solution to 7. A 10% mass fract