Multistage deep fluorine removal device for fluorine-containing wastewater

By using a multi-stage deep defluorination device, combined with crystallization, adsorption and co-precipitation technologies, the problem of treating high-concentration fluoride wastewater has been solved, achieving efficient and low-cost fluoride removal and resource recovery.

CN224030755UActive Publication Date: 2026-03-24SHENZHEN ACAD OF ENVIRONMENTAL SCI
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Patent Information

Application Number
CN202520441058.3
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-03-13
Publication Date
2026-03-24
Estimated Expiration
2035-03-13

AI Technical Summary

Technical Problem

Existing technologies are difficult to effectively treat high-concentration fluoride wastewater, especially to meet surface water environmental quality standards. Furthermore, traditional methods suffer from high energy consumption, membrane fouling, and high operating costs.

Method used

A multi-stage deep defluorination device is adopted, which utilizes the principle of crystallization-adsorption-co-precipitation. It employs crystallization tanks, coagulation tanks, coagulation aid tanks, flocculation tanks and high-efficiency sedimentation tanks, combined with calcium carbonate or hydroxyapatite seed crystals, calcium chloride solution, coagulant and flocculant, to achieve cascade defluorination, form calcium fluoride crystals and recover resources.

Benefits of technology

It achieves efficient and stable fluoride removal, with effluent fluoride levels below 1 mg/L, reduces sludge production, recovers calcium fluoride through resource utilization, is easy to operate and has low cost, and meets surface water environmental quality standards.

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Abstract

The utility model provides a multistage deep defluorination device for fluorine-containing wastewater. The multistage deep defluorination device comprises a crystallization tank, a coagulation tank, a coagulation aid tank, a flocculation tank, a precipitation water distribution tank and an efficient precipitation tank which are connected in sequence, a calcium chloride solution adding pipe is arranged in the crystallization tank; a first stirrer, a coagulant feeding pipe and an alkali liquor feeding pipe are arranged in the coagulation tank; a second stirrer and a particle medium adding mechanism are arranged in the coagulation aid tank; a flow guide cylinder is arranged in the flocculation tank, and a flocculant feeding pipe is arranged at the upper part of the flocculation tank; an inclined pipe and a water outlet collecting tank are arranged in the sedimentation water distribution tank; and a mud bucket and a mud scraper are arranged at the bottom of the efficient sedimentation tank. According to the technical scheme, the crystallization-adsorption-coordination-co-precipitation principle is utilized, fluorine is removed step by step, fluoride is efficiently and stably removed, meanwhile, the sludge yield is reduced, and calcium fluoride crystals can be recycled.
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