Method for electrochemically disinfecting gas diffusion electrode system

A disinfection method and diffusion electrode technology are applied in the fields of electrochemical water treatment and disinfection using a gas diffusion electrode system, and electrochemical water treatment and disinfection. Achieve the effect of good treatment effect, wide application range and low investment

Inactive Publication Date: 2009-09-16
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Another disadvantage of oxygen-consuming cathodes is that only oxygen dissolved in water can generate H 2 o 2
So, H 2 o 2 The output is very low, and the cathode generates H 2 o 2 The efficiency is very low, it is difficult to be practically applied in the field of wastewater and drinking water disinfection, and oxygen-consuming electrodes have not been widely used.

Method used

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  • Method for electrochemically disinfecting gas diffusion electrode system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1 carries out electrochemical disinfection with the composite gas diffusion electrode not containing pore-forming agent and catalyst as cathode

[0026] The present invention is to the total number of bacteria containing 10 6 The water distribution of CFU / mL is electrolyzed under the action of a composite gas diffusion cathode without pore-forming agents and catalysts, and the current density is controlled at 6.6mA / cm 2 , the oxygen flow rate reacted at 30L / h, samples were taken at different times, and the total number of bacteria was detected after 24 hours of cultivation by the standard plate method. It can be seen from the table below that when the energy consumption is equal to 0.62W·h / L, the sterilization efficiency is only 63.27%.

[0027] time (min) Energy Consumption(W·h / L) Bactericidal efficiency (%) 5 0.10 7.14 10 0.21 19.39 15 0.31 28.57 20 0.41 37.76 25 0.52 50.00 30 0.62 63.27

Embodiment 2

[0028] Example 2 contains pore-forming agent NH 4 HCO 3 Composite gas diffusion electrode as cathode for electrochemical disinfection

[0029] The present invention is to the total number of bacteria containing 10 6 The CFU / mL water distribution is electrolyzed under the action of a composite gas diffusion electrode with a pore-forming agent content of 30%. Other conditions are the same as application example 1. It can be seen from the table below that when the energy consumption is equal to 0.63W·h / L, the sterilization efficiency reaches more than 77%.

[0030] time (min) Energy Consumption(W·h / L) Bactericidal efficiency (%) 5 0.10 25.00 10 0.21 39.58 15 0.31 50.00 20 0.42 58.33 25 0.52 66.67 30 0.63 77.92

[0031] Under the action of a composite diffusion electrode with a pore-forming agent content of 40%, other reaction conditions are the same as above, and the electrolysis is carried out to obtain the following resu...

Embodiment 3

[0038] Embodiment 3 carries out electrochemical disinfection with the composite gas diffusion electrode containing catalyst Pt as cathode

[0039] The present invention electrolyzes the distribution water containing 106 CFU / mL of total bacteria under the action of a composite gas diffusion electrode with a catalyst Pt content of 2‰. Other conditions are the same as application example 1. It can be seen from the table below that when the energy consumption is equal to 0.58W·h / L, the sterilization efficiency reaches more than 79%.

[0040] time (min) Energy Consumption(W·h / L) Bactericidal efficiency (%) 5 0.10 14.63 10 0.20 32.93 15 0.29 48.78 20 0.39 58.54 25 049 67.07 30 0.58 79.27

[0041] Under the action of a composite diffusion electrode with a catalyst Pt content of 3‰, other reaction conditions were the same as above, and the electrolysis was carried out to obtain the following results:

[0042] time (min)...

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Abstract

The invention provides a method for electrically disinfecting a gas diffusion electrode system. The method adopts a nondiaphragm electrolysis system, uses active carbon with membrane structure/PTFE gas diffusion electrode as a cathode, a metal dimensionally stable electrode or a graphite polar plate as an anode, adopts aeration which is simple and practical in environmental engineering close to the cathode, controls the density of electrolytic current below 15mA/cm<2> and flow rate of oxygen in a range between 15 and 75L/h, uses reducing capacity of the cathode and electrocatalysis to generate H2O2, and decomposes the H2O2 to generate hydroxyl radical to sterilize, thereby achieving the aims of sterilization with safety and non-toxicity, equipment investment reduction and treatment effect improvement. The system has wider application range of pH value and is expected to be used in disinfection treatment of tap water or effluent of a secondary sedimentation tank of a sewage treatment plant.

Description

technical field [0001] The invention belongs to the field of environmental protection and energy saving, and relates to an electrochemical water treatment and disinfection method, in particular to an electrochemical water treatment and disinfection method using a gas diffusion electrode system. Background technique [0002] At present, commonly used disinfection processes include traditional chlorine disinfection, ultraviolet disinfection and ozone disinfection. Chlorination disinfection technology occupies a dominant position in the field of water treatment, but its main defect is that chlorine gas, the raw material for preparing chlorine disinfectants, is not only highly toxic, but also prone to fires, explosions, and even casualties during storage and transportation. At the same time, when it was discovered that chlorine disinfection would produce more carcinogens, the use of chlorine became more and more cautious. However, ozone disinfection and ultraviolet disinfection...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/467
Inventor 徐文英李平
Owner TONGJI UNIV
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