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Method and device for treating sewage through electrocatalytic oxidation

An electro-catalytic oxidation and sewage technology, which is applied in the fields of oxidized water/sewage treatment, chemical instruments and methods, water/sewage treatment, etc. To achieve the effect of not easy to fall off, good electron transfer performance and dense structure

Active Publication Date: 2019-06-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The problem of this method is that the bed is easy to block, the iron-carbon packing is easy to harden, and it cannot run stably for a long time.

Method used

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  • Method and device for treating sewage through electrocatalytic oxidation
  • Method and device for treating sewage through electrocatalytic oxidation

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The preparation process of titanium-based boron-doped diamond film electrode is as follows:

[0033] (1) Use a titanium plate with a thickness of 0.5 mm as the substrate, soak it in dilute hydrochloric acid for 30 minutes to remove the oxide layer on the surface, then put it in alcohol for ultrasonic cleaning, take it out and dry it with inert gas; use ultrasonic technology to inoculate diamond on the titanium plate Seed crystal, ultrasonic time is 5min; the preparation method of diamond seed crystal is: disperse powdered diamond with a particle size of about 0.5 μm in acetone solution, and the mass ratio of powdered diamond to acetone solution is 1:200; the prepared titanium plate Put it into the reaction chamber of microwave plasma vapor-phase chemical deposition equipment, use a vacuum pump to remove the air in the reaction chamber, and then pass CH 4 and H 2 As a reactive gas, mixed with H 2 The borane in the boron is used as a boron dopant, and the reaction press...

Embodiment 2

[0038] Concentrated water from an ultrafiltration reverse osmosis recycling unit in a petrochemical sewage treatment plant has a COD of 100-130mg / L and a salt content of 2580mg / L. The prepared titanium-based boron-doped diamond film / porous carbon / lead dioxide ternary composite electrode was used as the anode for electrocatalytic oxidation, and the activated carbon fiber electrode was used as the cathode. The distance between the plates was 10mm, and the applied voltage was 5V. The volume ratio of aeration rate to water inflow is 10:1, and the hydraulic retention time is 30 minutes. Add wood powder activated carbon 35mg / L, the mesh number is 250 mesh. The membrane separation system uses a ceramic membrane with a pore size of 100nm, and the reflux rate from the membrane separation system to the electrocatalytic oxidation system is 80%. After long-term operation, the effluent COD<50mg / L meets the requirements of the subsequent evaporation and crystallization device, and the oper...

Embodiment 3

[0040] The circulating water discharge of a chemical plant has a COD of 120-150mg / L and a salt content of 6550mg / L. The prepared titanium-based boron-doped diamond film / porous carbon / lead dioxide ternary composite electrode was used as the anode for electrocatalytic oxidation, and the activated carbon fiber electrode was used as the cathode. The distance between the plates was 100mm, and the applied voltage was 20V. Add wood powder activated carbon 40mg / L, mesh number is 250 mesh. The volume ratio of aeration rate to water inflow is 4:1, and the hydraulic retention time is 60 minutes. The membrane separation system uses a ceramic membrane with a pore size of 100nm, and the reflux rate from the membrane separation system to the electrocatalytic oxidation system is 50%. After long-term operation, the effluent COD is less than 50mg / L, which meets the discharge requirements. After 30 days of continuous use, the electrode is intact and the surface layer does not fall off.

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Abstract

The invention relates to a method for treating sewage through electrocatalytic oxidation. An electrocatalytic oxidation reactor with the following structure is adopted, an anode material of the reactor is a boron-doped diamond film / porous carbon / lead dioxide ternary composite electrode, and a cathode material is a good conductor of electricity generally, such as one or more of carbon steel, stainless steel, activated carbon fiber, graphite and the like, preferably activated carbon fiber; and activated carbon is added during sewage treatment. The boron-doped diamond film / porous carbon / lead dioxide ternary composite electrode material is adopted as an anode, and the filling particle coupling effect is combined, so that the method has the advantages of high oxidation efficiency, high pollutant degradation speed, low energy consumption and the like.

Description

technical field [0001] The invention belongs to the field of sewage treatment, and in particular relates to a method and device for electrocatalytic oxidation treatment of sewage. Background technique [0002] With the increasingly stringent sewage discharge standards in various places, the up-to-standard discharge of industrial refractory sewage has become a bottleneck restricting the development of enterprises, and the existing advanced sewage treatment technologies generally have problems such as low efficiency and high cost. Therefore, the development of efficient advanced treatment technologies is of great importance. It has important practical significance and is also a key issue that needs to be solved urgently in the field of water pollution control. Electrocatalytic oxidation technology is to complete the decomposition process of organic matter under the action of an external electric field. Compared with the traditional chemical oxidation reaction, the electrocata...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/461C02F1/72
Inventor 张鹏韩忠明马传军郭宏山王雪清马和旭
Owner CHINA PETROLEUM & CHEM CORP
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