Fluorine-containing wastewater pretreatment device

Abstract

The utility model discloses a fluorine-containing wastewater pretreatment device which comprises a series system consisting of a wastewater regulating tank, a multi-stage reaction unit, an inclined tube sedimentation tank, a treatment tank, a TMF (Tetramethylbenzidine) circulating unit and an activated carbon filter tank. The innovation points are as follows: the multi-stage reaction unit adopts the volume gradient design of a first-stage reaction tank and a second-stage reaction tank in a ratio of 1: 1.2-1.5, and is provided with a continuous turn-back type deflection baffle, so that the hydraulic retention time is prolonged by 40-60%, and the chelation reaction of fluorine ions and ferric salt / aluminum salt is enhanced. 50-60-degree hexagonal honeycomb filler is adopted in the inclined tube sedimentation tank to improve the floccule interception efficiency, a gel growth tank with an online particle size detection function is additionally arranged between the treatment tank and the TMF unit, and PAC is accurately added through 80-150-micrometer floccule particle size threshold value control. The matched sludge treatment system converts the fluorine-containing sludge into activated carbon through oxygen-controlled carbonization at 400-600 DEG C, so that the hazardous waste is reduced, and the adsorption capacity of the filter tank is improved. According to the device, through the multi-stage synergistic effect, the fluorine removal rate is increased, and meanwhile, the problem of blockage of the TMF membrane assembly is effectively avoided.