Three-dimensional electrode electro-catalytic reactor wastewater treatment method employing intermittent power supply

A three-dimensional electrode, wastewater treatment technology, applied in electrochemical water/sewage treatment, chemical instruments and methods, water/sewage treatment, etc., can solve the lack of effective competitiveness of three-dimensional electrode reactors and high energy consumption of three-dimensional electrode reactors , catalysts are easily lost and other problems, to achieve the effect of reducing energy consumption, efficient treatment, and reducing energy consumption

Inactive Publication Date: 2015-01-28
BEIJING GUOHUAN TSINGHUA ENVIRONMENT ENG DESIGN & RES INST CO LTD BEIJING CHINA
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Problems solved by technology

[0006] (1) Through comparative analysis of the results in the literature, it can be found that after loading catalyst materials, the oxidation performance of activated carbon, ceramic particles and other filling materials can be greatly improved, so it is of great significance to develop filling materials for loading catalysts. The development of catalyst packing materials is not enough, and some of the reported catalyst packing materials have the characteristics of low catalytic activity and easy loss of catalyst
[0007] (2) For the overall three-dimensional electrode reactor, the three-dimensional electrode reactor reported in the literature has the characteristics of low removal efficiency and high energy consumption, which makes the three-dimensional electrode reactor developed by it lack in practical application. effective competitiveness
After the research of the above two technologies, the three-dimensional electrode wastewater treatment system can treat pollutants stably and effectively. However, since the three-dimensional electrode reactor adopts the DC power supply mode, there is still a high energy consumption of the overall three-dimensional electrode reactor during the wastewater treatment process. Shortcomings

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  • Three-dimensional electrode electro-catalytic reactor wastewater treatment method employing intermittent power supply
  • Three-dimensional electrode electro-catalytic reactor wastewater treatment method employing intermittent power supply

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Embodiment 1

[0026] This embodiment uses a three-dimensional electrode catalytic reactor for reaction treatment of citric acid wastewater, specifically including: the raw wastewater enters COD 155 mg / L, passes through a pH adjustment pool, adds hydrochloric acid to adjust the pH to 5, and then enters a three-dimensional electrode catalytic reactor for reaction. The reaction time HRT is 0.5h and the water will come out.

[0027] In this embodiment, the pulse square wave current is used for power supply, and the operating parameters are: pulse square wave current power supply, the pulse duty ratio is 0.2, the pulse frequency is 0.02Hz, and the current density is 2.0mA / cm 2 .

[0028] In this embodiment, the COD removal rate of wastewater can reach 57%, while the energy consumption drops from about 146kWh / kg COD to about 65kWh / kg COD, thus saving energy consumption by kgCOD by 80kWh.

Embodiment 2

[0030] This embodiment uses a three-dimensional electrode catalytic reactor for reaction treatment of citric acid wastewater, specifically including: the COD concentration of the raw wastewater influent is between 160-180mg / L, after passing through the pH adjustment pool, adding hydrochloric acid to adjust the pH to 5, and then entering the three-dimensional The reaction is carried out in the electrode catalytic reactor, and the residence time is 1h. After the treatment, the water from the secondary sedimentation tank is discharged.

[0031] In this embodiment, a pulsed square wave current is used for power supply, and the operating parameters of the three-dimensional electrode catalytic reactor are: the current density is 5mA / cm 2 ,, The pulse duty ratio is 0.4, and the pulse frequency is 0.04Hz.

[0032] In this embodiment, the average COD removal rate of wastewater in continuous operation can reach 60-80%, while the average energy consumption decreases from 118kWh / kgCOD to ...

Embodiment 3

[0034] This embodiment uses a three-dimensional electrode catalytic reactor for reaction treatment of printing and dyeing wastewater, specifically including: the COD concentration of the influent wastewater is between 500-1000 mg / L, the pH value of the adjustment pool is controlled to about 5.5, and the water is discharged into the three-dimensional electrode catalytic reactor. Reaction, the residence time is 2.0h water. ,exist:

[0035] In this embodiment, the pulsed square wave current is used for power supply, and the operating parameters: the current density is 10mA / cm 2 , the pulse duty cycle is 0.35, and the pulse frequency is 0.04Hz.

[0036] In this embodiment, the average COD removal rate of continuous operation wastewater can be higher than 60%, and the energy consumption is 15-30kWh / kgCOD.

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Abstract

The invention relates to a three-dimensional electrode electro-catalytic reactor wastewater treatment method employing intermittent power supply, and belongs to the technical field of sewage treatment. The method comprises the following steps: adjusting pH of raw wastewater to 5.0-5.5 by adding hydrochloric acid in a pH regulating reservoir; entering a three-dimensional electrode reactor to react; and discharging water after the reaction time HRT of the three-dimensional electrode reactor is 0.5-2.0 hours, wherein the three-dimensional electrode reactor adopts a pulse square wave current power supply; the current density is 2.0-10mA/cm<2>; the pulse duty factor is 0.2-0.6; and the pulse frequency is 0.02-0.1Hz. The method disclosed by the invention is simple and convenient to operate; the reaction efficiency can be improved; and energy consumption for operation of the three-dimensional electrode reactor can be greatly reduced under the premise of ensuring the effluent quality under the same reaction time.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, in particular to an industrial wastewater treatment method using a three-dimensional electrode electrocatalytic reactor with intermittent power supply. Background technique [0002] After the traditional physical and biological treatment stages, the components with small molecular weight and easy biodegradation in industrial wastewater have been degraded, but the wastewater contains more long-chain macromolecules and cyclic molecules that are difficult to biodegrade, resulting in Wastewater has poor biodegradability and is not suitable for biological treatment. Therefore, it is imperative to develop suitable treatment technologies for the advanced treatment of industrial wastewater. [0003] The electrochemical oxidation method can use electric energy to make the anode form a high redox potential state, or generate high redox potential free radicals (such as hydroxyl radicals, free chlo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06C02F1/46
CPCC02F9/00C02F1/46C02F1/46109C02F1/66C02F2201/46C02F2201/46175
Inventor 汪诚文薛方勤孙利利赵雪锋付宏祥李艳王欣陆茵郝爽
Owner BEIJING GUOHUAN TSINGHUA ENVIRONMENT ENG DESIGN & RES INST CO LTD BEIJING CHINA
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