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Method for recovering fluoride ions from wastewater

A fluoride ion and waste water technology, applied in chemical instruments and methods, water pollutants, multi-stage water treatment, etc., can solve problems such as high fluoride ion concentration, achieve the effects of reducing environmental pollution, improving comprehensive utilization value, and simple treatment process

Inactive Publication Date: 2018-06-22
NANJING UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the problem of high concentration of fluoride ions in the effluent water after the treatment of fluorine-containing wastewater in the prior art, the present invention provides a method for recovering fluoride ions in wastewater, which uses resin to treat fluoride-containing wastewater, so that the concentration of fluoride ions reaches the discharge standard, and reuses The combination of diffusion dialysis technology and chemical precipitation method is used to treat the resin desorption solution, so that the high-concentration alkali solution can be reused as a desorption agent to the resin desorption section, and the fluoride ion is precipitated as a by-product or solid waste in the form of calcium fluoride precipitation. Recycle

Method used

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  • Method for recovering fluoride ions from wastewater

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Embodiment 1

[0038] like figure 1 Shown, the method for recovering fluoride ions in waste water of the present embodiment, its steps are:

[0039] (A) Pass fluorine-containing wastewater with a fluoride ion concentration of 0.5 mg / L through the adsorption tower filled with the resin at a flow rate of 1 times the bed volume of the resin itself per hour, wherein the bed volume of the resin itself refers to the composite resin packed in the adsorption column. The volume of the material matrix and the sum of the pore volume between the matrix; the adsorption tower used is a jacketed glass adsorption column, which is filled with 5mL resin. When the volume of treated fluorine-containing wastewater is 6,000 times the bed volume of the resin itself, the adsorption breakthrough point of the resin is reached at this time. Adopt desorption agent to carry out desorption regeneration to described resin, described desorption agent is sodium hydroxide solution, and the mass concentration of sodium hydro...

Embodiment 2

[0045] The method for recovering fluoride ions in waste water of the present embodiment, its steps are:

[0046] (A) The fluorine-containing wastewater with a fluoride ion concentration of 4 mg / L passes through the adsorption tower filled with the resin at a flow rate of 5 times the bed volume of the resin itself per hour. When the volume of treated fluorine-containing wastewater is 800 times the volume of the bed itself, the adsorption breakthrough point of the resin is reached. Adopt desorption agent to carry out desorption regeneration to described resin, described resin desorption agent is sodium hydroxide solution, and the mass concentration of sodium hydroxide is 7.5%, and this desorption agent is at the flow rate of 2 times of resin self-bed volume per hour For desorption and regeneration, a total of 6 times the volume of the resin's own bed volume of sodium hydroxide solution was used. The fluoride ion concentration in the desorption solution is 500mg / L, and the alkal...

Embodiment 3

[0052] The method for recovering fluoride ions in waste water of the present embodiment, its steps are:

[0053] (A) The fluorine-containing wastewater with a fluoride ion concentration of 8 mg / L passes through the adsorption tower packed with the material at a flow rate of 10 times the bed volume of the resin itself. When the volume of treated fluorine-containing wastewater is 400 times the bed volume of the value itself, the adsorption breakthrough point of the resin is reached at this time. Adopt desorption agent to carry out desorption regeneration to described resin, described resin desorption agent is sodium hydroxide solution, and the mass concentration of sodium hydroxide is 8%, and this desorption agent is with the flow velocity of 3 times resin self-bed volume per hour For desorption regeneration, a total of 4 times the volume of the resin's own bed volume of sodium hydroxide solution is used. The fluoride ion concentration in the desorption solution is 800mg / L, and...

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Abstract

The invention discloses a method for recovering fluoride ions from wastewater and belongs to the fields of wastewater treatment and resource recovery. The method specifically comprises the following steps: the fluoride ions in the fluorine-containing wastewater are discharged up to standard by resin adsorption; a resin desorption solution is treated with combination of a diffusion dialysis technique and a chemical precipitation method, wherein high-alkali effluent of diffusion dialysis effluent can serve as a resin desorption agent to be recycled to a resin desorption section; for high-fluorine effluent of the diffusion dialysis effluent, the fluoride ions are precipitated and recovered in a form of precipitates with the chemical precipitation method, a filtrate and the fluorine-containingwastewater are mixed in a certain ratio, resin is introduced for defluorination, and the fluoride ions in the wastewater are recovered in the form of high-purity calcium fluoride precipitates after being subjected to resin adsorption separation. In the method, alkali in the resin desorption solution is recovered with the diffusion dialysis technique, so that alkali amount needed by resin desorption is reduced substantially, sewage treatment cost is reduced, and effluent quality is guaranteed.

Description

technical field [0001] The invention belongs to the field of waste water treatment and resource recycling, and in particular relates to a method for recovering fluorine ions in waste water. Background technique [0002] Fluorine is one of the essential trace elements for life, but when the fluoride ion concentration in drinking water is higher than 1.5mg / L, it can cause dental fluorosis or even fluorosis. Industrial pollution is the main source of fluorine pollution in water bodies. According to the current literature reports and published invention patents, the actual treatment method of most fluorine-containing wastewater is chemical precipitation, but usually the fluorine concentration of the effluent after precipitation treatment is still maintained at 5-10mg / L, which is difficult to meet the standard stably, for example, China Application patent number 201410702256.7, patent name: a treatment method for acidic high-concentration fluorine-containing wastewater. Therefo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/14
CPCC02F9/00C02F1/5236C02F1/44C02F1/28C02F2303/16C02F2301/08C02F2101/14C02F2001/007
Inventor 张炜铭刘扬李婷潘丙才吕路花铭张孝林
Owner NANJING UNIV
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