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Defluorinating method of photovoltaic wastewater

A waste water and photovoltaic technology, applied in the direction of chemical instruments and methods, water pollutants, water/sewage multi-stage treatment, etc., can solve the problem of insufficient removal effect, achieve non-fragmentation and anti-pollution, and low fluorine content in effluent , to reduce the effect of using

Inactive Publication Date: 2011-04-06
HUZHOU XINGE MEMBRANE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main defect of this treatment process is that the concentration of fluoride ions in the supernatant is still high, and the removal effect is not good enough. This process can only treat industrial wastewater containing low concentration of fluoride ions

Method used

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  • Defluorinating method of photovoltaic wastewater
  • Defluorinating method of photovoltaic wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] 1. Preparation of modified double resin ion exchanger:

[0054] H-type styrene resin is 001×4 strongly acidic styrene hydrogen ion exchange resin produced by Jiangsu Linhai Resin Company; H-type acrylic resin is D113 macroporous weakly acidic acrylic hydrogen ion exchange resin produced by Jiangsu Linhai Resin Company resin.

[0055] Prepare aluminum sulfate solutions with a mass percentage concentration of 8% and 4% by conventional methods.

[0056] Prepare the modified double resin ion exchanger as follows:

[0057] A. Preparation of gel strong acid Al-type ion exchange resin: Fill the exchange column with 50ml of 001×4 strong acidic styrene-based hydrogen ion exchange resin at normal temperature and pressure, and inject 300ml of sulfuric acid with a mass percentage concentration of 8%. Aluminum solution, soaked for 2h, then washed with deionized water to prepare 50.2ml gel strong acid Al-type ion exchange resin, for subsequent use;

[0058] B. Preparation of macr...

Embodiment 2

[0097] The raw materials for the preparation of the modified double resin ion exchanger are the same as those in Example 1.

[0098] The preparation method of the modified double resin ion exchanger is the same as that of Example 1, except that in step C, the gel strong acid type Al-type ion exchange resin prepared in step A and the macroporous weak acid type Al-type ion exchange resin prepared in step B are prepared. , according to the molar mass ratio of 1:8 mixed to prepare a modified double resin ion exchanger.

[0099] After testing, the obtained modified double resin ion exchanger has an average particle size of 0.6mm, a spherical rate of 96.5%, a water content of 51.6%, and a wet true density of 1.46g / ml.

[0100] The modified double resin ion exchanger of this example was used to carry out the ion exchange experiment of defluorination of photovoltaic wastewater.

[0101] Photovoltaic waste water flows into the regulating tank by itself, and is fully mixed and homogeni...

Embodiment 3

[0113] The raw materials for the preparation of the modified double resin ion exchanger are the same as those in Example 1.

[0114] The preparation method of the modified double resin ion exchanger is the same as that of Example 1, except that in step C, the gel strong acid type Al-type ion exchange resin prepared in step A and the macroporous weak acid type Al-type ion exchange resin prepared in step B are prepared. , according to the molar mass ratio of 3:1 mixed to prepare a modified double resin ion exchanger.

[0115] After testing, the obtained modified double resin ion exchanger has an average particle size of 0.68mm, a spherical rate of 94.8%, a water content of 53.5%, and a wet true density of 1.38g / ml.

[0116] The modified double resin ion exchanger of this example was used to carry out the ion exchange experiment of defluorination of photovoltaic wastewater.

[0117] Photovoltaic waste water flows into the regulating tank by itself, and is fully mixed and homogen...

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Abstract

The invention relates to a method for removing fluorine ions from industrial wastewater, in particular to a defluorinating method of photovoltaic wastewater. The defluorinating method of photovoltaic wastewater contains four stages of processes in turn, namely chemical precipitation, flocculation-precipitation, air flotation-filtration, and ion adsorption. The defluorinating method of photovoltaic wastewater of the invention adopts the treatment technology combined by the chemical precipitation, the flocculation-precipitation and the air flotation-filtration, combines the advantages of the treatment method which uses the adsorbent to treat low concentration wastewater and can treat the photovoltaic wastewater with high-concentration fluorine ions continuously; the invention uses modified dual-resin ion exchanger as the adsorbent, the adsorbent can perform multiple regenerations and have low operating cost; and the effluent of the process has low fluoride content and stable water quality, and the method is suitable for the industrial reuse of the tap water.

Description

technical field [0001] The invention relates to a method for removing fluoride ions from industrial wastewater, in particular to a method for removing fluoride from photovoltaic wastewater. Background technique [0002] The solar photovoltaic industry requires multi-step treatment of polysilicon wafers. The industrial wastewater generated in these processes contains a relatively high concentration of fluoride ions. The main reason for the failure of solar wastewater to meet the standard is that the fluoride ions seriously exceed the standard. However, fluorine ion is highly toxic, and the fluorine content exceeds or falls below the allowable range, which will cause great harm to the human body. If the fluorine content is too high, it will affect the calcium and phosphorus metabolism of the human body, and make the material metabolism and physiological functions of the human body disordered. As a result, some symptoms of fluorosis such as kryptonite disease and plaque teeth a...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F101/14
Inventor 周文雄
Owner HUZHOU XINGE MEMBRANE TECH
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