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Method for removing silicon dioxide from high-salt printing and dyeing wastewater

A technology of printing and dyeing wastewater and silica, which is applied in chemical instruments and methods, energy wastewater treatment, water/sewage treatment, etc., can solve the problems of high cost and no specific solution, and achieve low hardness, cost reduction, good processing effect

Pending Publication Date: 2022-06-03
FOSHAN JIALIDA ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] But, it can be seen that there are still many concrete solutions that have not been proposed for the practical problems to be dealt with urgently in its practical application (currently, the method cost of using magnesium chloride to process silicon is relatively high).

Method used

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  • Method for removing silicon dioxide from high-salt printing and dyeing wastewater
  • Method for removing silicon dioxide from high-salt printing and dyeing wastewater
  • Method for removing silicon dioxide from high-salt printing and dyeing wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A method for removing silicon dioxide from high-salt printing and dyeing wastewater, comprising the following steps:

[0026] S1. Put ferric chloride, liquid caustic soda and polypropylene in the reaction tank, adjust the pH to 7.8-8.5 and go through the reaction tank for reaction, stirring and flocculation;

[0027] S2, stirring the solution in the reaction tank;

[0028] S3, put the stirred reaction solution into a sedimentation tank for precipitation;

[0029] S4, enter the reaction solution into the filter tank for filtration.

[0030] Specifically, as figure 1 As shown, the high-salt and high-silicon printing and dyeing wastewater (sodium chloride solution, water quality index: TDS about 20000-25000mg / L, SiO 2 The solution of about 80mg / L, PH about 8.3) is added to the reaction tank and put into ferric chloride, liquid caustic soda and polypropylene, and the pH is adjusted to 7.8 to react through the reaction tank; after the reaction and stirring, flocculation i...

Embodiment 2

[0033] The high-salt and high-silicon printing and dyeing wastewater in the reaction tank (sodium chloride solution, water quality indicators: TDS about 20000-25000mg / L, SiO 2 The solution of about 80mg / L, pH about 8.3) was added into the reaction tank and put into ferric chloride, liquid caustic soda and polypropylene, and adjusted the pH to 8.0 to react through the reaction tank; after the reaction and stirring, flocculation was generated, and the stirred reaction solution After being put into the inclined tube tank for precipitation and the reaction liquid was filtered, the SiO in the high-salt and high-silicon printing and dyeing wastewater in the reaction tank 2 The content can be controlled at 37.7mg / L; at the same time, the hardness will not increase significantly, and the content of heavy metals such as iron ions in the water will not increase significantly.

[0034] Further, in step S1, a stirring device is provided in the reaction tank, and the stirring device is use...

Embodiment 3

[0036] The high-salt and high-silicon printing and dyeing wastewater in the reaction tank (sodium chloride solution, water quality indicators: TDS about 20000-25000mg / L, SiO 2 The solution of about 80mg / L, PH about 8.3) is added into the reaction tank and put into ferric chloride, liquid caustic soda and polypropylene, and the pH is adjusted to 8.5 to react in the reaction tank; after the reaction and stirring, flocculation is generated, and the stirred reaction solution After being put into the inclined tube tank for precipitation and the reaction liquid was filtered, the SiO in the high-salt and high-silicon printing and dyeing wastewater in the reaction tank 2 The content can be controlled at 21.9mg / L; at the same time, the hardness will not increase significantly, and the content of heavy metals such as iron ions in the water will not increase significantly.

[0037] Further, the S3 reaction solution is put into the inclined tube pool and the reaction solution in S4 is put...

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Abstract

The invention provides a method for removing silicon dioxide from high-salt printing and dyeing wastewater, which comprises the following steps: adding ferric trichloride, caustic soda liquid and polypropylene into a reaction tank, adjusting the pH value to 7.8-8.5, and carrying out reaction, stirring and flocculation in the reaction tank; stirring the solution in the reaction tank; putting the stirred reaction liquid into a sedimentation tank for sedimentation; and filtering the reaction liquid in a filter tank. According to the method, the same amount of ferric trichloride is basically consistent with that of traditional magnesium chloride for removing silicon dioxide in the high-salt printing and dyeing wastewater, however, the unit price of ferric trichloride in the market is far lower than that of magnesium chloride, and the PH needs to be adjusted to be higher when magnesium chloride is used in the experiment process, that is, the usage amount of liquid caustic soda is large, cost is high, and the cost is low. Compared with magnesium chloride, the PH does not need to be adjusted to be high, the use amount of the liquid caustic soda is small, the hardness after treatment is lower, the treatment effect is good, and the treatment cost of enterprises can be effectively reduced.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a method for removing silica from high-salt printing and dyeing wastewater. Background technique [0002] The waste water produced by printing and dyeing enterprises enters the sewage treatment plant, and after physicochemical and biochemical treatment, RO membrane treatment is carried out to obtain fresh water and concentrated water. Fresh water is used as reclaimed water for external supply enterprises, and the concentrated water enters the zero-discharge system to separate salt and continue to concentrate, so as to purify sodium chloride and sodium sulfate and reuse it to printing and dyeing enterprises. In the process of using membrane equipment to concentrate sodium chloride solution in the zero-emission system, the content of silicon dioxide will also increase with the increase of the concentration of the membrane. Therefore, silicon dioxide must be removed to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04
CPCC02F9/00C02F1/60C02F1/5245C02F1/56C02F1/66C02F2001/007C02F1/001C02F2209/06C02F2209/055C02F2209/07C02F2209/08Y02W10/37
Inventor 姚颖梁跃施张良军区增辉钱原铬孔柱文林云烨
Owner FOSHAN JIALIDA ENVIRONMENTAL PROTECTION TECH
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