Fluorine-containing wastewater treatment device and method

Abstract

The invention relates to a fluorine-containing wastewater treatment method and a fluorine-containing wastewater treatment device. The method comprises the following steps: step 1, enriching fluorine ions in wastewater to a certain region by utilizing an external electrostatic field; step 2, separating the wastewater in the fluorine ion enrichment region from the wastewater in the less fluorine ionregion; step 3, removing most fluorine ions from the wastewater rich in fluorine ions by using a chemical precipitation method; step 4, enriching fluorine ions in the wastewater to a certain area byutilizing the external electrostatic field again after the step 3 is finished; step 5, separating the wastewater in the fluorine ion enrichment region and the wastewater in the less fluorine ion region again; step 6, removing most of the remaining fluoride ions from the re-separated fluoride ion enriched wastewater by using a flocculation precipitation method; and step 7, forcibly separating precipitates, floccules, floaters and clear liquid in the wastewater through the centrifugal effect; the de-fluorination efficiency of fluorine-containing wastewater can be remarkably improved, the de-fluorination cost is reduced, the occupied area is small, and wastewater de-fluorination can be continuously and efficiently achieved.

Description

technical field [0001] The invention relates to the field of environmental protection and emission reduction, in particular to a treatment device and a treatment method for fluorine-containing waste water. Background technique [0002] Fluorine is one of the essential trace elements for the human body, and the appropriate concentration of fluorine in drinking water is 0.5-1 mg / L. When the fluorine content in drinking water is insufficient, it is easy to suffer from dental caries; but if the fluorine concentration is higher than 1 mg / L for a long time, it will cause dental fluorosis; the long-term drinking fluorine concentration is 3-6 mg / L water can cause skeletal fluorosis. Fluoride-containing groundwater is widely distributed in my country, especially in the arid regions of Northwest China. About 70 million people drink water with excessive fluoride content, leading to varying degrees of fluorosis. In industry, fluorine-containing ore mining, metal smelting, aluminum pro...

AI Technical Summary

Problems solved by technology

Compared with the calcium salt precipitation method, the aluminum salt flocculation precipitation method has the advantages of less dosage of chemicals, large treatment capacity, and can reach the national discharge standard after one treatment; the aluminum salt flocculation precipitation method also has obvious disadvantages, that is, the scope of use is small , if the fluorine content is large, the amount of coagulant used will be large, the treatment cost will be large, and the amount of sludge generated will be large

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