Electric flocculation and tubular micro-filtration coupled high-concentration brine deep defluorination device

Abstract

The invention provides an electric flocculation and tubular micro-filtration coupled high-concentration brine deep defluorination device. The device comprises an electric flocculation system that comprises a reaction tank and an electrolytic assembly, wherein the electrolytic assembly comprises a periodic inverse DC power supply, a plurality of positive electrode plates and a plurality of negativeelectrode plates, the positive electrode plates and the negative electrode plates are arranged in the reaction tank, are arranged alternatively, and made of aluminum; a sedimentation assembly, whichcomprises a sedimentation tank, wherein the sedimentation tank is communicated with the reaction tank and receives the high-concentration brine in the reaction tank; and a tubular micro-filtration assembly, which comprises a circulating pump, a tubular micro-filtration membrane, a circulating water pipe and a water production pipe. The high-concentration brine flows out of the sedimentation tank and then enters the tubular micro-filtration membrane through the circulating pump, part of the high-concentration brine penetrates through the tubular micro-filtration membrane and then enters the water production pipe, and the rest of the high-concentration brine flows back into the reaction tank through the circulating water pipe. Through electric flocculation and tubular micro-filtration coupling, the fluorine removal rate of high-concentration brine is very high, and the problems of blockage and corrosion of effluent to subsequent electro-dialysis and evaporative crystallizers can be effectively avoided.

Description

technical field [0001] The invention relates to the technical field of high-concentration brine treatment, in particular to an electrocoagulation plus tube-type microfiltration coupling high-concentration brine deep defluorination device. Background technique [0002] The composition of coking wastewater is complex, with high content of organic matter, polycyclic aromatic hydrocarbons and macromolecules. Even after biochemical treatment, long-chain and persistent organic compounds in coking wastewater meet the discharge standards and may still pose a hazard to the environment. Conventional coking wastewater is first biochemically treated, and the biochemical effluent is then discharged or reused after advanced treatment. "Access Conditions for the Coking Industry (2008 Edition)" requires that phenol-cyanide wastewater must be recycled and must not be discharged. The domestic construction of the "zero discharge" project for phenol-cyanide wastewater has begun. The treatment ...

AI Technical Summary

Problems solved by technology

When the high-concentration fluorine-containing brine of coking wastewater enters electrodialysis treatment, calcium fluoride will be generated under the condition of low concentration of calcium and magnesium ions, resulting in scaling of the diaphragm. In addition, fluoride ions penetrate the membrane and enter the polar water, resulting in corrosion of the electrode coating , the life of the electrode is shortened

Secondly, the high-concentration fluorine-containing salt water enters the sodium chloride evaporative crystallizer, and the sodium chloride evaporative crystallizer is made of titanium, and a dense and stable oxide film will be formed on the surface of the titanium material to prevent corrosion, while fluoride combines with hydrogen ions to form hydrogen fluoride, hydrogen fluoride It will preferentially adsorb on the surface of titanium and combine with titanium ions to form soluble fluoride, which will cause pitting corrosion of titanium and affect the life of the evaporation crystallizer

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