Fluorine removing process and device for drinking water

Abstract

The invention discloses a fluorine removing process and a fluorine removing device for drinking water, and relates to a water treatment process and a water treatment device. The process at least comprises two treatment steps of coagulating sedimentation and adsorption, wherein the coagulating sedimentation is that fluorinated water is subjected to coagulating sedimentation through an inorganic aluminum coagulant agent to make the fluorine content of the treated water less than 2mg/l; and the adsorption is that an adsorbent is adopted for adsorption treatment. The invention has the advantages that: the low cost of a coagulation process and the high efficiency of an adsorption method are integrated, and the low-cost and high-efficiency fluorine removal is realized. In the coagulating sedimentation process, a proper amount of proper coagulant is selected according to the fluorine content in raw water, and the fluorine content in the water can be reduced, so that the regeneration frequency of the adsorbent is greatly reduced, the service life of the adsorbent is prolonged, the water treatment cost is reduced, and the invention has good application prospect for treating high-concentration fluorine-containing drinking water.

Description

technical field [0001] The invention relates to a water treatment process and device, in particular to a fluorine removal process and device. Background technique [0002] The treatment of fluorine in drinking water has been paid more and more attention by people. The domestic drinking water defluoridation methods mainly include the following: ①Coagulation sedimentation method: the coagulant used in the coagulation sedimentation method is mostly aluminum salt. Salt is added to the water to form aluminum hydroxide flocculent alum flowers, which absorb fluoride ions under the action of electric charges. After the flocculent alum flowers sink, they sink to the bottom together with the adsorbed fluorine to achieve the purpose of reducing the fluorine content in the water. The characteristic of this method is that the higher the fluorine content in water, the greater the adsorption capacity. Therefore, in order to reduce the fluorine content in water to below the drinking water ...

AI Technical Summary

Problems solved by technology

Compared with other methods, the effect of using activated alumina to remove fluorine is relatively stable, and it is a method that is used more at present, but the adsorption capacity of activated alumina is limited. When the fluorine content in water is high (greater than 2mg / 1 ), still has the problem of large usage and frequent regeneration. At the same time, the fluoride removal capacity of activated alumina is greatly affected by the pH value of the water, and the treatment effect is high under the condition of low pH value; under the condition of high pH value , the processing effect is significantly reduced

These greatly restrict the application of activated alumina

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