Recycling treatment method and device for catalytic cracking flue gas desulfurization wastewater

The invention discloses a resourceful treatment method and a resourceful treatment device for catalytic cracking flue gas desulfurization wastewater. The treatment method comprises the following steps: (1) pretreatment: sequentially carrying out ultrafiltration treatment and resin exchange on wastewater to remove suspended matters, hardness and heavy metal ions; (2) concentration: carrying out vacuum low-temperature distillation on the wastewater treated in the step (1) by utilizing process waste heat to obtain a concentrated solution and a clean condensate; and (3) bipolar membrane electrodialysis: treating the concentrated solution obtained in the step (2) to obtain a NaOH aqueous solution, a H2SO4 aqueous solution and a low-salt solution. The method provided by the invention has the advantages of simple treatment process, small agent usage amount and low energy consumption, and the obtained clean condensate, sodium hydroxide solution and sulfuric acid solution can be recycled, thereby realizing zero discha