Wastewater treatment method based on electro-Fenton reaction

A wastewater treatment and reaction technology, applied in water/sewage treatment, oxidized water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of high cost and many by-products, prolong service life and reduce side effects. product, the effect of improving the reaction efficiency

Inactive Publication Date: 2010-08-11
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under the existing technical conditions, this method generally adopts iron mud or stainless steel plate as the anode material of the electric Fenton reaction, and there are many by-products, and the cost is relatively high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The concentration of treatment is 40mg / L, the volume is 300mL of methylene blue and Congo red organic dye aqueous solution, the pH value of the system is not adjusted, wherein the pH of methylene blue aqueous solution is 6.35, and the pH of Congo red aqueous solution is 6.97. The anode and cathode are 40-mesh SUS 304 stainless steel mesh. Adjust the concentration of sodium sulfate electrolyte to 3g / L, and pass air into it for aeration. Turn on the DC power supply to control the current to 0.6A, and time the response. See Table 1 for the treatment effect

[0022] time (h)

1

2

Methylene blue (removal rate)

92％

99.7％

Congo red (removal rate)

84.8％

95.5％

[0023] Table 1

[0024] It can be seen from Example 1 that at about neutral pH, the electro-Fenton reaction can efficiently treat organic wastewater, and the effect is obvious.

Embodiment 2

[0026] The treatment concentration is 20mg / L, the volume is the methylene blue aqueous solution of 300mL, investigates the reaction effect of adjustment and unadjusted system pH respectively, when unadjusted intrinsic pH6.50, adjust the pH3.00 of system with hydrochloric acid solution; Anode and The cathode is an 80-mesh stainless steel mesh of SUS 304. Adjust the concentration of sodium sulfate electrolyte to 3g / L, and pass air into it for aeration. Turn on the DC power supply to control the current to 0.3A, and time the response. See Table 2 for the treatment effect

[0027] time (h)

1

2

Methylene blue pH6.50 (removal rate)

66.5％

92.8％

Methylene blue pH3.00 (removal rate)

99.8％

[0028] Table 2

[0029] As can be seen from Example 2, the efficiency of the electrochemical reaction is higher under acidic pH conditions, this is because the hydroxyl radical reaction of the Fenton reaction under acidic pH is dominant, ...

Embodiment 3

[0031] The treatment concentration is 40mg / L, and the volume is 300mL of methylene blue aqueous solution, and the effects of using stainless steel mesh and stainless steel plate with different meshes as reaction cathode and anode are respectively investigated. The pH of the system was not adjusted. Adjust the concentration of sodium sulfate electrolyte to 3g / L, introduce air for aeration, and time the reaction. For the treatment effect, see

[0032] table 3

[0033] time (h)

1

2

Methylene blue (removal rate) electrode: mesh number

40 mesh stainless steel mesh

80％

94.5％

Methylene blue (removal rate) electrode: mesh number

80 mesh stainless steel mesh

95％

99.4％

Methylene blue (removal rate) electrode: stainless

steel plate

72.3％

95％

[0034] table 3

[0035] It can be seen from Example 3 that with the increase of the mesh number of stainless steel, the removal efficiency of ...

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PUM

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Abstract

The invention discloses a wastewater treatment method based on electro-Fenton reaction, comprising the following steps of: applying a power supply to an electrode containing ferrum in wastewater so that the ferrum of the electrode loses electrons to form ferrous ions, reducing dissolved oxygen in the wastewater on the surface of a stainless steel cathode to generate hydrogen peroxide, and then reacting the hydrogen peroxide with the ferrous ions in the water to generate hydroxyl radicals for oxidizing and degrading organic matters in the wastewater. The invention is characterized in that the wastewater treatment method adopts stainless steel wires as an anode and the cathode for electrochemical reaction, and the power supply applied to the anode and the cathode is a power supply the directions of the anode and the cathode of which can be switched. The invention can reduce by-products of the electrochemical reaction and subsequent wastewater treatment cost and improve reaction efficiency through adopting the stainless steel wires sold in the market as the anode for the electro-Fenton reaction; and meanwhile, due to the adoption of a programmable power supply to switch the directions of the anode and the cathode regularly, the invention effectively prolongs the service life of the electrode and can be widely applied to the treatment of the wastewater with various pH values.

Description

technical field [0001] The invention relates to a wastewater treatment method using electrocatalytic oxidation, in particular to a wastewater treatment method using a simple and economical steel structure as an electro-Fenton reaction electrode, which is suitable for treating high-concentration printing and dyeing, chemical, pharmaceutical and other industries that are difficult to process. Degraded organic wastewater. Background technique [0002] For a long time, high-concentration refractory organic wastewater has been a difficult problem in water treatment technology. This kind of wastewater is mainly wastewater produced in the production process of dyes, pesticides, medicines, chemicals, coking, etc. The wastewater pollutants have high concentration, high toxicity, and high salt content, which is difficult to biodegrade. Therefore, pretreatment technologies and methods must be used to effectively Handle it properly. If these substances are discharged to the environmen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/461C02F1/72
Inventor 陈韦张铁锴
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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