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Enhanced electrochemical oxidation wastewater treatment device and treatment method

A technology for oxidizing wastewater and treating device, applied in the direction of sterilization/microdynamic water/sewage treatment, etc., can solve the problems of high operating cost, high energy consumption, low current efficiency, etc., and achieve simple operation, low energy consumption, and current density added effect

Active Publication Date: 2017-12-22
RESEARCH INSTITUTE OF TSINGHUA UNIVERSITY IN SHENZHEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In summary, the prior art has the following disadvantages: low current efficiency, high energy consumption, and high operating costs

Method used

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  • Enhanced electrochemical oxidation wastewater treatment device and treatment method
  • Enhanced electrochemical oxidation wastewater treatment device and treatment method
  • Enhanced electrochemical oxidation wastewater treatment device and treatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] [Example 1]: Treatment of methyl orange wastewater

[0074] The titanium mesh loaded with iridium-tantalum oxide coating is used as a disc-shaped anode sheet 21, and the activated carbon fiber felt is used as a disc-shaped cathode sheet assembly 22, with an electrode area of ​​32 cm 2 , electrode spacing 10mm, simulated wastewater methyl orange concentration 500mg / L, supporting electrolyte 0.05mol / LNa 2 SO 4 , the volume of treated wastewater is 300ml. The reactor is filled with air to 0.25MPa, and the dissolved oxygen concentration is above 20mg / L. When using the enhanced electrochemical oxidation wastewater treatment method, a certain voltage is applied to the cathode and anode, and the current density of the control electrode is 25mA / cm2 , and a comparative experiment with the same flow rate of air at normal pressure was carried out. After 30min enhanced electrochemical oxidation treatment, the removal rate of methyl orange reached 99.7%, while the removal rate un...

Embodiment 2

[0075] [Example 2]: cumulative concentration of hydrogen peroxide

[0076] The titanium mesh loaded with iridium-tantalum oxide coating is used as a disc-shaped anode sheet 21, and the activated carbon fiber felt is used as a disc-shaped cathode sheet assembly 22, with an electrode area of ​​32 cm 2 , electrode spacing 10mm, prepare 300ml of Na with a concentration of 0.05mol / L 2 SO 4 solution, with H 2 SO 4 Adjust the pH to 3. The reactor is filled with air to 0.4MPa, and the dissolved oxygen concentration is above 30mg / L. The current density is 80mA / cm 2 , the cumulative concentration of hydrogen peroxide can reach up to 5.2mmol / L during electrolysis for 90 minutes, while it is only 0.4mmol / L under normal pressure.

Embodiment 3

[0077] [Example 3]: Treatment of emulsion wastewater

[0078] The titanium mesh loaded with iridium-tantalum oxide coating is used as a disc-shaped anode sheet 21, and the activated carbon fiber felt is used as a disc-shaped cathode sheet assembly 22, with an electrode area of ​​32 cm 2 , the electrode spacing is 10mm, the COD concentration of the emulsion wastewater is 11000mg / L, and the supporting electrolyte is 0.05mol / LNa 2 SO 4 , the treatment volume is 300ml. The reactor is filled with air to 0.25MPa, and the dissolved oxygen concentration is above 20mg / L. When using the enhanced electrochemical oxidation wastewater treatment method, a certain voltage is applied to the cathode and anode, and the current density of the control electrode is 25mA / cm 2 , and a comparative experiment with the same flow rate of air at normal pressure was carried out. After 30 minutes of enhanced electrochemical oxidation treatment, the COD removal rate reached 66.3%, while the removal rate...

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Abstract

The invention relates to an enhanced electrochemical oxidation wastewater treatment device and a treatment method. The enhanced electrochemical oxidation wastewater treatment device includes a pressure tank body, an electrolytic cell is placed vertically in the pressure tank body, the electrolytic cell is connected with an external DC power supply through positive and negative terminal posts outside the pressure tank body, and a pressure tank is provided on the top of the pressure tank body. Meter, safety valve, water outlet, the bottom of the pressure tank body is provided with an air distribution system that communicates with the inside and outside of the pressure tank through the air inlet pipe, the central axis of the pressure tank body is provided with a water distribution system that communicates with the outside world, and the pressure tank body is also provided with To control and adjust the pressure and dissolved oxygen concentration in the pressure tank, the pressure sensor and the dissolved oxygen detection sensor are respectively set in the pressure tank, the first proportional control valve at the water outlet of the pressure tank, and the air pressure in front of the air inlet pipe of the pressure tank. It is an automatic control system that determines the difference between the pressure value, dissolved oxygen concentration and the set value according to the signal collected by the sensor, and controls the start and stop of the air compressor and the opening of the two proportional control valves.

Description

technical field [0001] The invention relates to the field of sewage purification treatment, in particular to a method of increasing the concentration of dissolved oxygen in a pressure vessel by pressurizing dissolved air to promote electrochemical reactions to produce more strong oxidizing species, thereby strengthening the treatment of organic pollution in wastewater Enhanced electrochemical oxidation wastewater treatment device and treatment method for biodegradation. Background technique [0002] Electrochemical oxidation is an environmentally friendly advanced oxidation technology. There is no need to add oxidants in wastewater treatment, and the risk of chemical pollution is small. The reaction conditions are mild, generally carried out at normal temperature and pressure; it has the functions of air flotation, flocculation, sterilization and oxidation. The reaction device and process are simple, highly operable, and easy to realize automatic control. It is widely use...

Claims

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Application Information

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IPC IPC(8): C02F1/467
Inventor 王丹丹陈福明曹凯
Owner RESEARCH INSTITUTE OF TSINGHUA UNIVERSITY IN SHENZHEN
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