Multistage filtering device for PTA (pure terephthalic acid) wastewater

The invention discloses a PTA wastewater multi-stage filtering device, and relates to the technical field of PTA wastewater filtration, the PTA wastewater multi-stage filtering device comprises a filter cartridge, an anti-blocking mechanism and a driving mechanism are arranged in the filter cartridge, the filter cartridge comprises an outer cartridge body, and the inner part of the outer cartridge body is divided into a reaction cavity and a liquid discharge cavity through a filter screen; the anti-blocking mechanism comprises a rotating shaft and a spiral blade; the driving mechanism comprises a circulating water pump, a driving box is assembled at the bottom of the outer barrel, and one end of the rotating shaft penetrates and extends into the driving box and is fixedly provided with a plurality of paddles. The rotating shaft and the spiral blade are assembled to stir PTA wastewater to form rising vortex, so that ion exchange resin is in full contact with the PTA wastewater; the blades are driven by liquid