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Method for processing chromium-containing tanning wastewater by using magnetic coagulation method

A technology of tannery wastewater and coagulation, which is applied in the direction of flocculation/sedimentation water/sewage treatment, chemical instruments and methods, water/sewage multi-stage treatment, etc. Long and other problems, to achieve the effect of short separation interval time, good precipitation and dehydration effect, and shortened precipitation time

Inactive Publication Date: 2013-08-14
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the problems in the prior art that the amount of waste water flocculation sedimentation is large, the sedimentation period is long, and the dehydration of the flocs is difficult, resulting in difficulty in separation, the separation of flocs is not complete, and seriously affects the efficiency and effect of wastewater treatment. Objective To propose a method that combines magnetic separation and traditional chemical coagulation to treat chromium-containing tannery wastewater. The preparation device is simple and easy to operate. It can effectively reduce harmful substances in tannery wastewater, especially heavy metal chromium, and meet the national discharge standards. The amount of sedimentation slag is greatly reduced, the precipitation time is significantly shortened, the separation is thorough, and the separation effect is significantly enhanced

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] (1) 8.6gFeCl 2 4H 2 O with 23.4gFeCl 3 ·6H 2 Dissolve O to 500ml, heat to 80-90°C, and then add 7ml of 0.1mol / L NaOH solution to react to produce superparamagnetic Fe 3 o 4 nanoparticles;

[0016] (2) Add 0.8gFeSO 4 , the above 10mlFe 3 o 4 Mix the particle solution, add 10ml of 50mg / L polyacrylamide solution into 1L of tanning wastewater, and fully shake the reaction;

[0017] (3) Place the above-mentioned oscillating wastewater in a magnetic field, and after 5 minutes of settling, remove the wastewater supernatant, and then separate the floc precipitation. The chromium content of the supernatant after separation was measured by atomic absorption spectrophotometer, and the chromium removal rate was calculated. The turbidity and chromaticity of the supernatant wastewater after separation were measured by ultraviolet spectrophotometer, and the chemical oxygen demand of the supernatant liquid of separated wastewater was determined by potassium dichromate method. ...

Embodiment 2

[0019] (1) 8.6gFeCl 2 4H 2 O with 23.4gFeCl 3 ·6H 2 Dissolve O to 500ml, heat to between 80-90°C, then add 28ml of 25% NH 3 ·H 2 O solution reacts to produce superparamagnetic Fe 3 o 4 nanoparticles;

[0020] (2) Add 0.8gFeSO 4 , the above 10mlFe 3 o 4 Mix particle solution, add 10ml of 50mg / L polyacrylamide solution into 1L of tannery wastewater, fully shake and react;

[0021] (3) Place the above-mentioned oscillating wastewater in a magnetic field, and after 5 minutes of settling, remove the wastewater supernatant, and then separate the floc precipitation. The chromium content of the supernatant after separation was measured by atomic absorption spectrophotometer, and the chromium removal rate was calculated. The turbidity and color of the separated supernatant wastewater were measured by ultraviolet spectrophotometer, and the chemical oxygen demand of the separated supernatant wastewater was determined by potassium dichromate method.

Embodiment 3

[0023] (1) 8.6gFeCl 2 4H 2 O with 23.4gFeCl 3 ·6H 2 Dissolve O to 500ml, heat to between 80-90°C, then add 28ml of 25% NH 3 ·H 2 O solution reacts to produce superparamagnetic Fe 3 o 4 nanoparticles;

[0024] (2) Add 0.4g polyferric sulfate, the above 10ml Fe 3 o 4 Mix particle solution, add 10ml of 50mg / L polyacrylamide solution into 1L of tannery wastewater, fully shake and react;

[0025] (3) Place the above-mentioned oscillating wastewater in a magnetic field, and after 5 minutes of settling, remove the wastewater supernatant, and then separate the floc precipitation. The chromium content of the supernatant after separation was measured by atomic absorption spectrophotometer, and the chromium removal rate was calculated. The turbidity and color of the separated supernatant wastewater were measured by ultraviolet spectrophotometer, and the chemical oxygen demand of the separated supernatant wastewater was determined by potassium dichromate method.

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Abstract

The invention provides a method for processing chromium-containing tanning wastewater by using a magnetic coagulation method. The method comprises the steps of: preparing Fe3O4 nanoparticles with superparamagnetism by using a chemical coprecipitation method; adding a coagulant, the Fe3O4 nanoparticles and a flocculant to the chromium-containing tanning wastewater and stirring; and putting the mixed wastewater in a magnetic field, and completing the separation of flocculate-containing tanning wastewater under the control of the magnetic field. The method has the advantages that the operation is convenient, the equipment is simple, and harmful substances, particularly heavy metal chromium, in the tanning wastewater can be effectively reduced; the disadvantages of the traditional chemical coagulation method are overcome, the amount of precipitated residues is greatly reduced, the precipitation time is obviously shortened, and the separation effect is obviously enhanced; and the method has broad application prospects in the industrial application field of heavy metal polluted wastewater treatment.

Description

technical field [0001] The invention relates to a method for treating chrome-containing tannery wastewater by magnetic coagulation. Background technique [0002] Magnetic nanoparticles are a kind of magnetic materials (mainly Fe oxides) at the nanoscale (1-100nm), and are the earliest magnetic nanomaterials to be applied. Magnetic nanoparticles have good magnetic orientation, superparamagnetism, biocompatibility, etc., and are widely used in the fields of magnetic recording materials, magnetic fluid preparation, and biomedicine. When the particle size of magnetic particles reaches the nanometer level, its specific surface area increases sharply and its adsorption capacity becomes stronger. Under the action of an external magnetic field, it can generate magnetism and make directional movement. After the magnetic field is removed, the magnetism disappears, so it can be easily separated. Its preparation methods are generally divided into physical method, chemical method and ph...

Claims

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Application Information

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IPC IPC(8): C02F9/12C02F1/52C02F101/22C02F103/24
Inventor 官月平赵申朱婷马翔
Owner UNIV OF SCI & TECH BEIJING
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