Method for improving activity of pyrite-catalysis type Fenton sustained reaction

A reactive, pyrite technology, applied in the direction of oxidized water/sewage treatment, etc., can solve problems such as decreased catalytic efficiency, and achieve the effects of enhanced reactive activity, low energy consumption, and low dosage

Active Publication Date: 2015-08-19
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using pyrite and its slag as a catalyst can improve the utilization efficiency of hydrogen peroxide. The loss of the catalyst in the reaction process is small, and the advantages of repeated use are significant. However, long-term repeated use will lead to a decrease in catalytic efficiency, catalyst passivation, and catalytic reactions at high pH The passivation under the value condition is significant

Method used

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  • Method for improving activity of pyrite-catalysis type Fenton sustained reaction
  • Method for improving activity of pyrite-catalysis type Fenton sustained reaction
  • Method for improving activity of pyrite-catalysis type Fenton sustained reaction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The pyrite that will be reused many times and the catalytic efficiency declines is taken out from the reaction solution, and after drying, 10g of the pyrite material is weighed, and 100ml, 1.5 μmol / L copper sulfate solution is added, placed on a magnetic stirrer, and Stir at a speed of 200 rpm. During the stirring process, air is introduced into the solution by sand core aeration. The air flux is 2L / min under normal temperature and pressure conditions. After 40 minutes of reaction, add N to the reaction system ,N-bis(carboxymethyl)-L-glutamate tetrasodium solution, the mass ratio of pyrite or slag to N,N-bis(carboxymethyl)-L-glutamate tetrasodium is 110:1 Keep aeration and stirring, stop the aeration after 5 hours of reaction, add 5mL of sodium sulfide solution with a mass fraction of 3 / 10,000 to it, stir and react for one hour, let the minerals precipitate naturally, discharge the reaction solution after the precipitation is complete, and put the processed Minerals are...

Embodiment 2

[0033] The pyrite slag that has been reused many times and the catalytic efficiency has decreased is taken out from the reaction solution, weighed 10g of the pyrite slag after drying, added 200ml, 1.5μmol / L copper sulfate solution, and placed in a magnetic stirrer Stir at a speed of 200 revolutions per minute. During the stirring process, air is introduced into the solution by sand core aeration. The air flux is 2L / min under normal temperature and pressure conditions. After 40 minutes of reaction, the reaction system is Add N,N-bis(carboxymethyl)-L-glutamate tetrasodium solution, the mass ratio of pyrite or slag to N,N-bis(carboxymethyl)-L-glutamate tetrasodium is 500:1 Keep aeration and stirring, stop the aeration after 5 hours of reaction, add 10mL of ammonium sulfide solution with a mass fraction of 3 / 10,000 to it, stir and react for three hours, let the minerals precipitate naturally, and discharge the reaction solution after the precipitation is complete. Naturally dry the ...

Embodiment 3

[0035] The biochemical effluent from the secondary sedimentation tank of the actual printing and dyeing wastewater has a pH of 7.48 and a COD of 104mg / L. Add 0.4g (i.e. 2g / L) of mineral prepared as described in Example 1, then add 0.02ml / L hydrogen peroxide therein, place on a magnetic stirrer, stir with 250 revolutions per minute for 30s, then with 100 revolutions per minute The reaction was stirred at a rotating speed of 2 hours for 2 hours. After the used mineral precipitate is taken out, it can be reused directly in the above way, and the water effluent effect is shown in Table 1.

[0036] Table 1 Reuse effect of pyrite treatment

[0037]

[0038] After treatment, the effect of pyrite is significantly improved, and it still has good catalytic activity after being reused for 6 times. The catalytic effect of untreated pyrite is not obvious in the process of recycling. The pyrite catalyzed by the technical conditions The effect is obviously better than that of untreated ...

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Abstract

The invention relates to a method for improving the activity of a pyrite-catalysis type Fenton sustained reaction. The method comprises the following steps: adding pyrite or calcined cinder with a passivated reaction into water, and performing aerated stirring after adding a copper sulfate solution; then, adding a N,N-di(carboxymethyl)-L-tetrasodium glutamate aqueous solution, keeping the aerated stirring for 5 hours, stopping aeration, adding a sulfide solution into the solution, performing a stirring reaction for 0.5-3 hours, naturally precipitating minerals, and discharging a reaction solution after completely precipitating; and naturally drying the obtained minerals, thereby completing activating treatment on the pyrite. Compared with the prior art, the recycling efficiency of a mineral material catalyst is improved through a chemical method, and the catalytic performance, under a high pH condition, of a mineral catalytic reaction further can be improved.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a method for improving the catalytic Fenton continuous reaction activity of pyrite. Background technique [0002] With the diversification of pollutants produced in industrial production and the increasing difficulty in the degradation of pollutants, it has been difficult for traditional wastewater treatment technologies to achieve standard discharge treatment. Taking the printing and dyeing industry as an example, printing and dyeing companies develop dyes that are resistant to photolysis, oxidation, and biodegradation. The new dyes have brought great technical difficulties to the treatment of dye wastewater while meeting the needs of human beings. Therefore, the development of an efficient, economical and applicable refractory wastewater treatment technology has positive and far-reaching significance for protecting the water environment and promoting the d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72
Inventor 吴德礼章智勇
Owner TONGJI UNIV
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