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A kind of method for treating chlorine-containing organic wastewater by heterogeneous fenton-like reaction

A technology of organic wastewater and reaction, applied in chemical instruments and methods, oxidized water/sewage treatment, chemical/physical processes, etc., can solve the problems of low utilization rate and high cost

Inactive Publication Date: 2011-12-28
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the traditional Fenton reagent method still has many deficiencies in practical application, such as H 2 o 2 The utilization rate is not high; the optimal pH value of the reaction is limited to 2 to 4, and the pH value needs to be adjusted before and after the reaction; after the reaction is completed, the iron ions in the solution need to be separated by precipitation and other methods, and the cost of post-treatment is relatively high. higher

Method used

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  • A kind of method for treating chlorine-containing organic wastewater by heterogeneous fenton-like reaction
  • A kind of method for treating chlorine-containing organic wastewater by heterogeneous fenton-like reaction
  • A kind of method for treating chlorine-containing organic wastewater by heterogeneous fenton-like reaction

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The preparation process of nano-zero-valent iron is as follows: Pre-add FeSO with a concentration of 4mM in a four-neck round bottom flask 4 ·7H 2 O solution 100mL, stirring and argon gas to make it in an anaerobic state, the concentration of 20mM KBH 4 100mL of the solution was dropped into a four-necked round-bottomed flask through a regulating valve, and kept stirring to make the solution in a uniformly mixed state. After 1.5 hours of reaction, the synthesized nano iron particles were precipitated, washed twice with deionized water, and dried in vacuum to obtain nano Fe 0 . Nano Fe 0 The morphology is regular spherical particles with a particle size of 80-150nm.

[0046] The experiment compared the heterogeneous Fenton method (while adding nano-Fe 0 And H 2 O 2 ), add nano Fe separately 0 And add H separately 2 O 2 The conversion rate, dechlorination rate and TOC removal rate of 4-chloro-3-methylphenol under the three methods.

[0047] Nano Fe 0 And H 2 O 2 In the combined...

Embodiment 2

[0056] The preparation process of magnetic nano-ferroferric oxide is as follows: prepare 100mL of 0.2M NaOH solution and place it in a four-neck round-bottomed flask in a constant temperature water bath at 80°C; stir and pass argon to make the round-bottomed flask in an oxygen-free state; Fe 2 (SO 4 ) 3 And FeSO 4 ·7H 2 100mL of O solution, of which Fe 2 (SO 4 ) 3 And FeSO 4 ·7H 2 The concentration of O is 0.02M and 0.01M respectively, and a certain amount of concentrated sulfuric acid is added to the solution to inhibit Fe 2+ The oxidation; this mixed solution is dropped into a four-neck round-bottom flask at a certain speed through a regulating valve, and reacts with the NaOH solution to generate nano-Fe 3 O 4 Particles, after 1.5h of reaction, the synthesized nano Fe 3 O 4 The particles are precipitated, washed twice with deionized water, and dried in vacuum to obtain nano-Fe 3 O 4 . Nano Fe 3 O 4 The morphology is regular spherical particles with an average particle size of 5...

Embodiment 3

[0067] The preparation process of nano-zero-valent iron is the same as in Example 1; the preparation process of the magnetic nano ferroferric oxide is the same as in Example 2.

[0068] Heterogeneous Fenton method was used to treat 4-chloro-3,5-dimethylphenol wastewater. The initial concentration of wastewater was 150mg / L, pH was not adjusted (pH 6.3), and 1.0g / L nano-Fe was added at the same time 0 / Fe 3 O 4 Mixture (of which Fe 0 With Fe 3 O 4 The mass ratio is 1:1) and 18mM H 2 O 2 , Place the reactor in a water bath shaker with a speed of 150 rpm and a temperature of 30°C. The treatment results are shown in Table 3.

[0069] Detection method: the same as in Example 1.

[0070] The results in Table 3 show that the heterogeneous Fenton method has a better effect on the treatment of 4-chloro-3,5-dimethylphenol wastewater. After 180 minutes of reaction, the conversion rate of 4-chloro-3,5-dimethylphenol is as high as 100%, the dechlorination rate and TOC removal rate are also high. ...

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Abstract

The invention discloses a method for treating chlorine-containing organic waste water by a heterogeneous phase Fenton-like reaction, which belongs to the technical field of environment protection. The method adopts nanometer FeO, nanometer Fe3O4 or a mixture of nanometer FeO / Fe3O4 as a Fenton-like catalyst, and allows chlorine-containing organic waste water to react in the presence of both the Fenton-like catalyst and H2O2 so as to degrade chloro-substituted organic matter in the waste water. The invention has simple equipment, convenient operations, easily available reagents, can efficiently remove chlorine-containing organic matter in waste water within a wide pH range (Ph 2.0-6.3), and has great application prospects.

Description

Technical field [0001] The invention belongs to the technical field of environmental protection, and specifically relates to a method for treating chlorine-containing organic wastewater by a heterogeneous Fenton reaction. Background technique [0002] Chlorinated organics include chlorinated hydrocarbons, chlorinated aromatic hydrocarbons, organochlorine pesticides, etc., and are widely used in printing and dyeing, papermaking, dry cleaning, metal parts processing, electronic equipment manufacturing, organic pesticides and other industries. Because of their many sources, their presence can now be detected in surface water, groundwater and soil. Chlorine-containing organic wastewater is highly toxic, difficult to biodegrade, and has a "three-factor effect", causing direct damage and potential threats to the ecological environment and human health. Therefore, it is of great significance to study economical, efficient, and non-secondary pollution treatment methods and technologies....

Claims

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Application Information

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IPC IPC(8): C02F1/72B01J23/745
Inventor 王建龙徐乐瑾
Owner TSINGHUA UNIV
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