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Electrocatalytic oxidation method and reaction unit for difficult-to-degrade waste water

An electrocatalytic oxidation and reaction device technology, applied in chemical instruments and methods, oxidized water/sewage treatment, water/sewage treatment, etc., can solve the problems of secondary pollution, large primary investment in equipment, and high operating energy consumption, and reduce Wastewater treatment cost, improved biodegradability, and effect of enhanced mass transfer

Active Publication Date: 2018-05-25
BEIJING UNIV OF CHEM TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The Fenton method and the iron-carbon micro-electrolysis method, while effectively degrading organic pollutants, will produce a large amount of iron sludge hazardous waste by-products, which are also very difficult to deal with, bringing secondary pollution risks, and do not meet the requirements of clean production ; The conventional plate electrode catalytic oxidation method can effectively degrade organic pollutants, but the current efficiency is low and the operating energy consumption is high; of general significance

Method used

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  • Electrocatalytic oxidation method and reaction unit for difficult-to-degrade waste water
  • Electrocatalytic oxidation method and reaction unit for difficult-to-degrade waste water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] The electrocatalytic oxidation reaction device for refractory wastewater includes a reaction vessel 1 , an electrode plate 2 oppositely disposed in the reaction vessel 1 , and a total waste water inlet 3 and a total waste water outlet 4 . The reaction vessel 1 is filled with an electrocatalyst 9, and two injectors 5 are coaxially fixed on the side wall of the reaction vessel 1 facing each other. The air inlet 7 on the injector 5 communicates with the outside atmosphere, and the injection port at the front end is located inside the reaction vessel 1, so that the two jets generated by the injector 5 are ejected, and the electrocatalyst 9 generates a collision flow, and the waste water at the tail end of the injector 5 The inlet is located outside the reaction vessel 1 , and the waste water inlet communicates with the lower part of the reaction vessel 1 through the waste water circulation pipeline 6 . A circulation pump 8 is provided on the wastewater circulation pipeline ...

Embodiment 2

[0054] In the electrocatalytic oxidation reaction device used for refractory wastewater as in Example 1, the wastewater with biological toxicity and high organic matter content (BOD 5 / COD value is 0.1) into the reaction vessel 1 through the total waste water inlet 3, under the action of the circulation pump 8, the waste water sucks air through the air inlet 7, mixes with the waste water entering the injector 5, and the gas-liquid two-phase mixture flows out After the injector 5 passes through the electrocatalyst 9, it collides with each other coaxially. The voltage between the two electrode plates is 50V, and the current density is 0.01A / cm 2 , the electrocatalytic oxidation reaction of wastewater was carried out for 1h. After the reaction is completed, take a water sample to detect the BOD of the refractory wastewater 5 The / COD value is 0.6, indicating that the biodegradability has been greatly improved, and the subsequent biochemical method can be used for advanced treat...

Embodiment 3

[0058] In the electrocatalytic oxidation reaction device for refractory wastewater as in Example 1, the refractory wastewater (COD is 3940) with a salt content exceeding 2% enters the reaction vessel 1 through the total wastewater inlet 3, and the refractory wastewater in the circulation pump 8 Under the action of the air inlet 7, the wastewater sucks air and mixes with the wastewater entering the injector 5, and the gas-liquid two-phase mixture flows out of the injector 5 and passes through the electrocatalyst 9, colliding with each other coaxially. The voltage between the two electrode plates is 25V, and the current density is 0.05A / cm 2 , The electrocatalytic oxidation reaction of wastewater was carried out for 2h.

[0059] After the reaction, the water sample was taken for testing. The COD value of the wastewater after the reaction was 36. The test results showed that the pollutants had been removed to a great extent, and the removal rate was over 99%.

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Abstract

The invention discloses an electrocatalytic oxidation method and a reaction unit for difficult-to-degrade waste water. The method comprises the following steps of performing electrochemical reaction treatment on waste water in the reaction unit, and enabling the waste water to circulate in the treatment process; the reaction unit comprises a reaction vessel (1), wherein ejectors (5) are arranged on the reaction vessel (1) and used for ejecting the waste water into the reaction vessel (1) in a flow ejecting mode, the ejectors (5) are positioned between two electrode plates (2), and every two ejectors (5) are coaxially and oppositely fixed on the side walls of the reaction vessel (1), so that ejected flow generated by two ejectors (5) can impact oppositely after ejection. The electrocatalytic oxidation method and the reaction unit can be used for obviously enhancing the mass transfer effect of the waste water, improving degradation efficiency and reducing the treatment cost of the wastewater.

Description

technical field [0001] The invention relates to the technical field of electrocatalytic oxidation of wastewater, in particular to an electrocatalytic oxidation method and a reaction device for refractory wastewater. Background technique [0002] With the development of industrial enterprises in our country, the discharge of wastewater is increasing, and a large amount of industrial wastewater is discharged into water bodies and rivers, seriously affecting the environment and human health. Biochemical method is the use of biological action to convert dissolved and colloidal organic pollutants in wastewater into harmless substances. The cost of wastewater treatment by this method is low, and the operation and management are more convenient. Therefore, biochemical treatment is one of the most important processes in the wastewater treatment system, and is widely used in the secondary treatment of domestic sewage and easily degradable industrial organic wastewater. However, petr...

Claims

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Application Information

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IPC IPC(8): C02F1/461C02F1/72
CPCC02F1/4672C02F2305/023
Inventor 张婷婷李晟
Owner BEIJING UNIV OF CHEM TECH
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