Fluorine-containing wastewater treatment method

Abstract

The invention discloses a fluorine-containing wastewater treatment method, which comprises the following steps: (1) regulating the pH value of the fluorine-containing wastewater to 3-8, and adding a chemical defluorinating agent into the fluorine-containing wastewater to react; after the reaction, adding an alkali to adjust the pH value of the reaction solution to 6-9, adding polyacrylamide to carry out a flocculation reaction, and carrying out solid-liquid separation to obtain a primary purified solution and primary filter residues; and (2) carrying out dynamic adsorption on the primary purified liquid by adopting modified strongly basic anion resin, and deeply removing fluorine in the primary purified liquid to obtain a secondary purified liquid. According to the invention, Fluorine in the wastewater is deeply treated through a chemical precipitation method and modified strongly basic anion resin, and fluorine in final effluent is stably lower than 1 mg / L.

Description

technical field

[0001] The invention relates to a treatment method for fluorine-containing wastewater, which belongs to the technical field of wastewater treatment. Background technique

[0002] Fluorine is one of the widely distributed elements in nature. Among all the elements, fluorine ranks 13th in the earth's crust, mainly composed of fluorite (CaF2), cryolite (Na3[AlF6]) and fluoroapatite (Ca10(PO4)6F2 )exist. Fluorine is widely used in industry, and can be used to synthesize coolants such as Freon; used to make fluorinated reagents (xenon difluoride, etc.) and fluxes (cryolite, etc.) in metal smelting; ClF3 and BrF3 can be used as rockets Fuel oxidant; for the system of pesticides and fire extinguishing agents and so on.

[0003] Trace amounts of fluorine are beneficial to prevent dental caries. If the fluorine content in water is less than 0.5 ppm, the incidence rate of dental caries will reach 70% to 90%. However, if the fluoride content in drinking water exceeds...

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