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Treatment method of fluoride-containing wastewater and application

A treatment method and technology for wastewater, applied in water/sewage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problems of increased operating costs, poor sedimentation performance of suspensions, strict operating conditions, etc. To achieve the effect of mud-water separation

Active Publication Date: 2017-05-31
郑州亦森环保科技有限公司
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Problems solved by technology

But Ca 2+ with F - CaF formed in aqueous solution 2 The particle size is very small, and the sedimentation performance of the suspension after the reaction is poor
Although adding coagulant can improve this problem to a certain extent, it requires very strict operating conditions
If the membrane method is used to separate the mud-water mixture after the reaction, this will inevitably increase the operating cost

Method used

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  • Treatment method of fluoride-containing wastewater and application
  • Treatment method of fluoride-containing wastewater and application
  • Treatment method of fluoride-containing wastewater and application

Examples

Experimental program
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Effect test

Embodiment 2

[0052] Embodiment 2—dosing Ca(OH) first 2 , then add CaCl 2 (two-step method)

[0053] Add Xmol Ca(OH) to the fluorine-containing wastewater at a temperature of 60°C and a pH of 8 2 , after stirring and reacting at a speed of 150r / min for 30min, continue to add Ymol CaCl 2 , stirring and reacting for 30 min at a speed of 150 r / min. In order to achieve the purpose of comparison with the one-step method of Example 1, investigate the settling performance of the mud-water mixture after the reaction of the two modes, making X be Ca 2+ 110% of the theoretical dosage of ions, Y is Ca 2+ 95% of the theoretical dosage of ions.

[0054] Result as shown in Figure 2, (a) is the one-step method of embodiment 1, (b) is the two-step method of implementation 2. Compared with the one-step method, the settling performance after the two-step method has been significantly improved. When standing for 30 minutes, the supernatant accounted for 35% of the volume of the entire mixed solution, an...

Embodiment 3

[0059] In actual engineering, the water quality composition of raw water is difficult to be constant. In order to investigate whether the optimal conditions obtained in the research are applicable to other water quality conditions, F - Raw water with a concentration of 1000, 2500, 5000, 7500 and 10000 mg / L was operated according to the following one-step method and two-step method respectively, adding Ca 2+ The theoretical dosage of ions is 110% of Ca(OH) 2 and 95% CaCl 2 , compare the fluorine removal efficiency (standing for 360min) and the sedimentation performance of the mixed solution between the one-step method and the two-step method, the results are as follows image 3 and 4.

[0060] One-step method - a treatment method for high-fluorine wastewater, comprising the following steps: simultaneously adding Ca(OH) to high-fluorine wastewater 2 and CaCl 2 , stirring and reacting for 30 minutes; wherein, the temperature of the high-fluorine wastewater is 60°C and the pH ...

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Abstract

The invention discloses a method for treating fluoride-containing wastewater. The method comprises the following steps: adding Xmol Ca(OH2) to the fluoride-containing wastewater with pH of 7-9 under the temperature of 40-70 DEG C; stirring to react for at least 20 minutes; then continuously adding Ymol CaCl2; stirring to react for at least 20min. According to the method for treating the fluoride-containing wastewater, after the reaction is finished, supernate accounts for 70% of the volume of the fluoride-containing wastewater while standing for 120 minutes, so that the mud-water separation of the mixed liquid can be realized. The invention further discloses a treatment method of high-fluoride-containing wastewater. When the treatment method is used for treating the high-fluoride-containing wastewater of which the F concentration is not lower than 5000mg / L, the F concentration of the supernate can be reduced to be 10mg / L or lower after the reaction is finished and the standing still is carried out for 30 minutes. Therefore, the emission standard is met.

Description

technical field [0001] The invention belongs to the field of industrial water treatment, and in particular relates to a treatment method and application of fluorine-containing wastewater. Background technique [0002] In recent years, with the development of my country's nuclear industry, the waste water produced has also increased year by year. f - It is one of the main pollutants, and the concentration in nuclear fuel element wastewater is even as high as tens of thousands of milligrams per liter. If it is not properly treated, it will cause serious harm to the environment if it is discharged into the environment. For such high-concentration fluorine-containing wastewater, commonly used ion exchange methods, membrane separation methods, adsorption methods and other fluoride removal technologies are difficult to apply, and the operating costs are high. Simple and efficient chemical defluorination method is the ideal choice to solve the problem, the most commonly used chem...

Claims

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Application Information

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IPC IPC(8): C02F1/58C02F101/14
CPCC02F1/58C02F2101/14
Inventor 胡小锐
Owner 郑州亦森环保科技有限公司
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