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Wastewater electro-oxidation treatment method based on current density cascade control

A technology of current density and treatment method, applied in the field of wastewater electro-oxidation treatment based on current density cascade control, can solve problems such as high energy consumption and limit large-scale industrial applications, and achieves improved mass transfer reaction, is conducive to degradation, and improves current The effect of efficiency

Inactive Publication Date: 2021-07-09
ZHEJIANG SHUREN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the high energy consumption required for wastewater electrooxidation treatment limits the large-scale industrial application of this technology.

Method used

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  • Wastewater electro-oxidation treatment method based on current density cascade control
  • Wastewater electro-oxidation treatment method based on current density cascade control
  • Wastewater electro-oxidation treatment method based on current density cascade control

Examples

Experimental program
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Effect test

Embodiment 1

[0018] Such as figure 1 As shown, the wastewater electrooxidation treatment method based on current density step control of the present invention adopts a continuous stirring box type electrooxidation device, including a DC power controller 2, a pollutant monitor 3, an electrode assembly 4 and a reaction unit 1. Stirrer 5. The pollutant monitor 3 monitors the concentration of pollutants in each reaction unit of the electro-oxidation device, and feeds it back to the DC power controller 2, and the DC power controller 2 performs cascade control of the current density.

[0019] This method is used to treat the actual wastewater of a textile printing and dyeing enterprise. The average concentration of COD in wastewater is 285mg / L, the average concentration of ammonia nitrogen is 35mg-N / L, and pH 9. Three reaction units are designed, and the hydraulic retention time of each reaction unit is 60min. The electrode spacing is 1cm, and the current density range is 10-20mA / cm 2 , stepwi...

Embodiment 2

[0021] This method is used to treat the actual wastewater of a pharmaceutical company. The average concentration of COD in the wastewater is 895mg / L, the average concentration of ammonia nitrogen is 155mg-N / L, and the pH is 8.6. Two reaction units are designed, and the hydraulic retention time of each reaction unit is 90min. The spacing is 4cm, the current density range is 27.5~30mA / cm 2 , stepwise decrease of 2.5mA / cm in front and back reaction units 2 , that is, the first reaction unit sets the current density to 30mA / cm 2 , the second reaction unit set the current density 27.5mA / cm 2 . After treatment, the removal rates of COD and ammonia nitrogen are 67.2% and 92.1%, respectively, the current efficiency is 37.2%, and the energy consumption is 33.4kWh / m 3 . Compared with the traditional electro-oxidation process (30mA / cm 2 ), the pollutant removal rate is very close, but the energy saving is about 21.2%.

Embodiment 3

[0023] This method is used to treat actual wastewater in an industrial park. The average concentration of COD in wastewater is 220mg / L, the average concentration of ammonia nitrogen is 25mg-N / L, and pH 6. Four reaction units are designed, and the hydraulic retention time of each reaction unit is 20min. The distance is 1cm, the current density range is 5~12.5mA / cm 2 , stepwise decrease of 2.5mA / cm in front and back reaction units 2 , that is, the first reaction unit sets the current density to 12.5mA / cm 2 , the second reaction unit set the current density 10mA / cm 2 , the third reaction unit set the current density 7.5mA / cm 2 , the fourth reaction unit set the current density 5mA / cm 2 . After treatment, the removal rates of COD and ammonia nitrogen are 90% and 100% respectively, the current efficiency is 33.6%, and the energy consumption is 13.6kWh / m 3 . Compared with the traditional electro-oxidation process (12.5mA / cm 2 ), the pollutant removal rate is very close, but t...

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Abstract

The invention discloses a wastewater electro-oxidation treatment method based on current density cascade control, and belongs to the technical field of wastewater treatment. The treatment process is as follows: wastewater enters the continuous stirring box type electro-oxidation device and sequentially passes through reaction units controlled by different current densities to realize electro-oxidation decomposition of pollutants in the wastewater. According to the invention, by controlling the current density in a gradient descending trend, the current efficiency is improved, the energy consumption is reduced and the energy conservation and emission reduction in the wastewater electro-oxidation treatment process are realized while the pollutants are efficiently degraded.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a wastewater electro-oxidation treatment method based on current density step control. Background technique [0002] With the continuous development of society, the composition of wastewater produced by various industrial activities is becoming more and more complex, and the content of pollutants is getting higher and higher. The treatment of this type of wastewater has become a difficult problem in the field of water pollution control. Electro-oxidation is one of the most promising green methods for treating refractory industrial wastewater. It can oxidize pollutants into CO through electron migration on the electrode surface and catalytic reaction of active substances. 2 , N 2 and H 2 O, thereby effectively reducing the content of various pollutants in wastewater. However, the high energy consumption required for wastewater electrooxidation treatment...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/467C02F1/461C02F101/30
CPCC02F1/4672C02F1/46109C02F2201/4614C02F2201/4617C02F2209/14C02F2209/08C02F2209/06C02F2101/30
Inventor 姚佳超梅瑜陈浚
Owner ZHEJIANG SHUREN UNIV
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