Fluorine-containing industrial wastewater treatment process and final-stage treatment device and process thereof

Abstract

The invention discloses a fluorine-containing industrial wastewater treatment process and a final-stage treatment device and process thereof. The process comprises the following steps: (1) regulating the pH value of sewage to 7-8 by hydrochloric acid or liquid caustic soda; (2) adding bleaching water to oxidize the sewage to reduce the COD value of the sewage; (3) precipitating and filtering the sewage through a lime slurry pool, and removing fluorine ions and part of excessive bleaching water; (4) adding hydrochloric acid into the filtered sewage clear liquid to neutralize, precipitate and filter; (5) pumping the sewage filtered again into an activated carbon adsorption tower, and meanwhile, introducing ozone to start aeration, so as to further reduce the COD value of the sewage; (6) discharging after reaching the discharge standard; the treatment efficiency and effect of the fluorine-containing industrial wastewater can be remarkably improved, the adsorption efficiency of the adsorption material is improved in the final-stage treatment process, the adsorption material is convenient to replace, the adsorption material can be regenerated in real time, organic pollutants in the fluorine-containing industrial wastewater can be effectively treated, and the treatment cost can be obviously reduced under the condition that the wastewater reaches the national allowable emission standard.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a fluorine-containing industrial waste water treatment process and its final treatment device and process. Background technique [0002] In recent years, with the rapid development of modern industry, especially the electronics industry and the mining and processing of fluorine-containing minerals, the wastewater discharged contains a large amount of fluoride, resulting in a sharp increase in the annual discharge of fluoride-containing wastewater. The massive discharge of fluorine pollutes the environment and threatens human health, so it is necessary to strengthen the treatment of fluorine-containing industrial wastewater. At present, the treatment and monitoring of fluorine-containing wastewater not only focus on the pollution of fluoride ions, but also the organic pollutants in wastewater have attracted great attention. Organic pollutants are difficult to biodegrade,...

AI Technical Summary

Problems solved by technology

The existing final treatment process uses adsorption materials for adsorption, but usually it is directly added, the distribution is uneven, the adsorption materials are difficult to recycle and reuse, the adsorption efficiency is low, and the amount of adsorption materials is too large, not only difficult to achieve the expected adsorption effect , and the cost remains high

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