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Flurine ion removing agent and method for treating flurine ion containing waste water using it

A technology of removing agent and fluoride ion, which is applied in the direction of sludge treatment, water/sewage treatment, natural water treatment, etc. It can solve the problems of large amount of sludge difficulty, difficult treatment and maintenance of secondary sedimentation and filtration equipment, long time, etc.

Inactive Publication Date: 2001-12-19
苏在春
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, said method is very complicated since the fluoride ion treatment method includes a 2-step method in which secondary filtration-separation is necessary.
Furthermore, it is also very difficult to operate, handle and maintain the equipment for secondary sedimentation and filtration, which takes a long time, and more importantly, it is very difficult to deal with the large amount of sludge generated from the sewage treatment process

Method used

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  • Flurine ion removing agent and method for treating flurine ion containing waste water using it
  • Flurine ion removing agent and method for treating flurine ion containing waste water using it
  • Flurine ion removing agent and method for treating flurine ion containing waste water using it

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Experimental program
Comparison scheme
Effect test

Embodiment 1～6 and comparative Embodiment 1～6

[0056] The fluoride ion treatment agent according to the present invention is composed of two solutions. After preparing the hydrochloric acid solution that reacts with calcium carbonate, in which the content of calcium carbonate is 5, 8, 10, and 15 wt% and the concentration of hydrochloric acid is 0.0, 5.0, and 10.0%, each solution is added to the containing In the 400ppm fluoride ion semiconductor sewage, the pH value is controlled above 8.0 by adding sodium hydroxide solution, and each solution is stirred and precipitated. The results of the removal efficiency of fluoride ions are shown in Table 1.

[0057] [Table 1]

[0058] Classification

Lime solution

Sewage containing fluoride ions

Hydrochloric acid concentration

(wt%)

Calcium carbonate

(wt%)

Injection volume

(ppm)

Before treatment

Concentration

Treated

Concentration

Processing efficiency

(%)

Comparative Example 1

0

5

10000

400

...

Embodiment 7～12

[0063] In order to achieve suitable pH conditions and treatment efficiency for removing fluoride ions, in many fluoride ion removers in the present invention, hydrochloric acid that reacts with calcium carbonate is used to treat the fluoride ions contained in sewage according to the difference in pH value. After treatment, a hydrochloric acid solution reacted with calcium carbonate as a fluoride ion treatment agent was prepared, in which the content of calcium carbonate was 20% by weight and the concentration of hydrochloric acid was 10.0%.

[0064] Add 10,000 ppm of the above solution to the semiconductor sewage containing 400 ppm of fluoride ion, and control the pH value at 5.0, 6.0, 7.0, 8.0, 9.0 and 10.0 respectively by adding sodium hydroxide solution, and stir each solution And precipitation. The results of the fluoride ion removal efficiency are shown in Table 2.

[0065] Classification

Lime solution

Add hydrogen and oxygen

Sodium sulfide

pH value

S...

Embodiment 13～48

[0069] In the preparation of another fluoride ion treatment agent of the present invention, that is, a solution of a mixture of sodium polymetaphosphate and an active aluminum compound, by adding sodium polymetaphosphate with a content of 0.0, 0.5, 1.0 and 1.5 wt%, respectively, and adding 5 , 10 and 15 wt% of active aluminum compound to prepare aqueous solutions, respectively.

[0070] After preparing the mixed solution, 10,000 ppm of the hydrochloric acid solution (where the concentration of hydrochloric acid is 10% by weight and the content of calcium carbonate is 20% by weight) reacted with calcium carbonate is added to the semiconductor sewage containing 400 ppm of fluoride ions, by adding hydroxide The sodium solution controls the pH above 8.0. And then the prepared mixture solution of sodium polymetaphosphate and active aluminum compound (aluminum chloride, aluminum sulfate or polyaluminum chloride) is injected until the pH value of the sewage reaches 6 to 7, and the floccu...

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Abstract

The invention relates to a fluoride ion remover for removing soluble fluorine ions contained in sewage and a treatment method for using the remover to treat sewage containing fluoride ions. In order to achieve the above object, the present invention provides a remover for removing fluoride ions, which contains: a) a hydrochloric acid solution reacted with calcium carbonate, and b) an aqueous solution of a mixture of sodium polymetaphosphate and active aluminum or a mixture thereof , or an aqueous solution of a rare earth element composition, and a method for treating sewage containing fluorine ions using the remover. The remover for removing soluble fluoride ions of the present invention and the method for using the remover to treat sewage containing fluoride ions can easily remove fluoride ions to less than 10 ppm at a low cost, and make the whole treatment process All the generated sludge can be reused, and the time required for sewage treatment is greatly shortened by simplifying the complex traditional treatment process for treating sewage containing fluoride ions, and the labor cost is reduced due to the shortened process by using simpler equipment.

Description

[0001] This application is based on the applications No. 10-2000-30429 and No. 10-2001-29563 filed at the Korean Industrial Property Office on June 2, 2000 and May 29, 2001, respectively. This can be cross-referenced. Technical field [0002] The invention relates to a dissolved fluoride ion remover for removing fluoride ions contained in sewage and a method for treating sewage containing fluoride ions using the remover. More specifically, the present invention relates to a new treatment method, wherein the method not only can effectively remove very low content of fluoride ions, but also by adding calcium carbonate, sodium polyphosphate and activated aluminum as main substances The sludge produced in the process forms a very stable sediment and can be reused. Background technique [0003] The commonly used method of treating sewage containing fluoride ions (the sewage is produced by various semiconductor production plants, electrolysi...

Claims

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Application Information

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IPC IPC(8): C02F1/58C02F1/52C02F1/66C02F1/76C02F11/00C02F11/12
CPCC02F1/5245C02F1/66C02F1/76C02F11/12C02F2101/14C02F2103/346Y10S210/915C02F1/58
Inventor 苏在春
Owner 苏在春
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