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A method for treating organic wastewater by using heterogeneous catalyst to efficiently activate persulfate

A technology for activating persulfate and heterogeneous catalysts, applied in the direction of oxidized water/sewage treatment, etc., can solve the problems of a large amount of iron sludge and low effective utilization rate of persulfate, achieve high utilization rate, easy recycling and reuse, reduce Effect of acid cost

Active Publication Date: 2015-09-02
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a kind of can effectively for the problem that existing persulfate activated oxidation reaction system exists that the pH of the reaction system is acidic, the oxidation reaction is too fast so that the effective utilization rate of persulfate is low and a large amount of iron sludge is produced. Heterogeneous Catalyst Nano-Fe to Solve the Above Problems 0 , Nano-FeO x h y (y=2x-3 or 3y=6x-8), FeO x h y Fe 0 (FeO x h y Fe 0 , y=2x-3 or 3y=6x-8) nanocomposite activated persulfate is an advanced persulfate oxidation method for efficient and rapid removal of toxic, harmful and refractory organic matter in wastewater

Method used

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  • A method for treating organic wastewater by using heterogeneous catalyst to efficiently activate persulfate
  • A method for treating organic wastewater by using heterogeneous catalyst to efficiently activate persulfate
  • A method for treating organic wastewater by using heterogeneous catalyst to efficiently activate persulfate

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Experimental program
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Effect test

Embodiment 1

[0038] Embodiment 1: The experiment has compared the decolorization rate and COD of AO7 by using nano-FeOOH to activate sodium persulfate, adding nano-FeOOH and adding sodium persulfate separately cr removal rate.

[0039] Nano-Fe 0 In the heterogeneous reaction of activated sodium sulfate, the Erlenmeyer flask is used as the reactor, the reaction volume of the wastewater is 250mL, and the treatment conditions are that the initial concentration of the wastewater containing AO7 is 70mg / L, COD cr It is 133mg / L, and pH is 7.0, adds nanometer FeOOH and sodium persulfate to make its concentration be respectively 0.5g / L and 476mg / L in reaction bottle simultaneously, and reaction bottle is placed in shaking bed, and rotating speed is 150rpm, temperature is 25°C.

[0040] In the experiment of adding nano-FeOOH alone, there is no need to add sodium persulfate, and other conditions are the same as above.

[0041] In the experiment of adding sodium persulfate alone, there is no need t...

Embodiment 2

[0047] Embodiment 2: Experiment has compared utilizing nanometer Fe 0 AO7 decolorization rate and COD of activated sodium persulfate under acidic, neutral and alkaline conditions cr removal rate.

[0048] Nano-Fe 0 In the heterogeneous reaction of activated sodium sulfate, the Erlenmeyer flask is used as the reactor, the reaction volume of the wastewater is 250mL, the treatment conditions are that the initial concentration of the wastewater containing AO7 is 70mg / L, and the COD cr to 133mg / L, adjust the pH of the wastewater to four different pH environments of 3.0, 5.0, 7.0, and 9.0, and add nano-Fe to the reaction bottle at the same time 0 and sodium persulfate so that the concentrations were 0.3g / L and 476mg / L respectively, and the reaction bottle was placed in a vibrating bed with a rotating speed of 150rpm and a temperature of 25°C.

[0049] Nano Fe 0 Its shape is regular spherical particles with a particle size of about 50nm.

[0050] The wastewater treatment time is...

Embodiment 3

[0054] Embodiment 3: in this embodiment contrasted different initial concentration AO Waste water solution is in nanometer Fe 2 o 3 Fe 0 Decolorization Efficiency and COD in Activated Sodium Persulfate System cr The effect of removal rate.

[0055] Nano-Fe 2 o 3 Fe 0 In the heterogeneous reaction of activated sodium persulfate, the Erlenmeyer flask is used as the reactor, the reaction volume of the wastewater is 250mL, the initial concentration of the wastewater containing AO7 is changed, the pH of the wastewater is not adjusted (pH is 3.8), and nano Fe 2 o 3 Fe 0 Make the concentration 0.5g / L and sodium persulfate, the ratio of the concentration of sodium sulfate added (mg / L) to CODcr (mg / L) is 5:1.

[0056] Finally, the reaction bottle was placed in a vibrating bed with a rotation speed of 150 rpm and a temperature of 25°C.

[0057] Nano Fe 2 o 3 Fe 0 Its form is regular spherical particles with a particle size of 80-100nm.

[0058] The wastewater treatment tim...

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Abstract

The invention discloses a method for utilizing a heterogeneous catalyst to efficiently activate persulfate so as to treat organic wastewater, belonging to the technical field of water pollution control. According to the method, nano Fe0, nano FeOxHy (y=2x-3 or 3y=6x-8) and FeOxHy@Fe0 (FeOxHy@Fe0, y=2x-3 or 3y=6x-8) nano composite materials are used as a heterogeneous catalyst, so that persulfate is activated to produce sulfate free radicals having strong oxidizing property, thereby removing nondegradable organic substances in wastewater. Besides, due to the characteristics of high specific area, high catalytic activity and the like, the solid-phase nano catalyst can efficiently and persistently activate the persulfate to be subjected to heterogeneous activation. The method is applicable to treatment of various organic wastewater, has the advantages of high efficiency, favorable persistence, convenient operation process and environment friendliness, and can efficiently remove toxic and harmful pollutants in the wastewater in a wider pH value range, thus providing broad prospects for treatment of toxic, harmful and nonbiodegradable organic wastewater.

Description

technical field [0001] The invention relates to a high-level oxidation water treatment technology in which a heterogeneous catalyst efficiently activates persulfate, and belongs to the technical field of water pollution control. Background technique [0002] With the prosperity of the world economy and the rapid development of industry, the production and circulation of persistent organic pollutants seriously threaten the ecological environment and human health. Therefore, new treatment technologies and methods for persistent organic pollutants are constantly emerging, and the research on the degradation of persistent organic pollutants based on sulfate radicals has attracted extensive attention of researchers at home and abroad. SO produced by activated persulfate 4 -· The standard redox potential of 2.6V is slightly lower than the redox potential (2.7V) of OH generated in the Fenton system, but compared with OH, SO 4 -· Relatively stable under acidic and neutral condit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/72
Inventor 万金泉王艳马邕文李欢旋黄明智
Owner SOUTH CHINA UNIV OF TECH
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