Method and device for degrading organic wastewater by micro active oxygen generated through electrocatalytic reduction of air oxygen

Abstract

The invention relates to a method and device for degrading organic wastewater by micro active oxygen generated through electrocatalytic reduction of air oxygen, and belongs to the technical field of wastewater treatment. According to the method and device, air (aeration) is continuously connected into the cathode inside an electrochemical reactor, a large amount of micro active oxygen such as O3, free radical *OH and H2O2 is generated through a concerted reaction under the combined action of various catalysts and cathode currents, the micro active oxygen has extremely-high oxidizing capacity, hence, organic matter in the wastewater can be directly oxidized and degraded, and the purpose of deeply removing organic pollutants is achieved. In addition, the adopted method and device are simple, power consumption is small, and the degradation effect is good. Moreover, equipment can continuously and efficiently operate in a circulation mode, and great practical application value is achieved.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a method and a device for degrading organic wastewater by using microactive oxygen generated by electrocatalytic reduction of air oxygen. Background technique [0002] At present, a lot of organic wastewater contains a large number of toxic and harmful components to microorganisms, some are even highly toxic, and can kill most microorganisms, so it cannot be completely degraded only by biochemical treatment. For example: coking wastewater is wastewater produced during the process of coal coke, gas purification and coking product recovery. Its chemical composition is very complex, containing a large amount of ammonia nitrogen, sulfide, cyanide and a variety of biologically toxic organic pollutants, high chroma , High toxicity and difficult to be degraded by microorganisms. The treatment of coking wastewater in various countries at home and abroad is facin...

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Problems solved by technology

The treatment of coking wastewater in various countries at home and abroad is facing severe problems, the treatment is difficult, and the effluent quality is difficult to meet the standard, which has become a major problem that has plagued the coking wastewater treatment industry for decades.

[0003] In recent years, many inventors have developed various wastewater treatment devices and technologies through original designs and improved processes. New methods and technologies are constantly being used to treat refractory organic wastewater, but each has its own advantages and disadvantages. The COD of the effluent , ammonia nitrogen or chroma are still difficult to achieve satisfactory results, and it is difficult to meet the new national emission standards

For example, in the coking wastewater treatment technology: although the cost of the biological oxidation method is low, it occupies a large area, and the concentration of COD and ammonia nitrogen in the effluent is high, so it is difficult to meet the discharge standards; the activated carbon adsorption method has a rich pore size distribution and a large The specific surface area has a strong adsorption capacity. Although it can reduce the COD value of wastewater, it is easy to absorb saturation, the concentration of ammonia nitrogen in the effluent is high, and there are also problems such as difficult regeneration of the adsorbent and secondary pollution; Catalytic oxidation can also degrade organic substances that are difficult to biodegrade, but the operation is complicated, the treatment efficiency is very low, the energy consumption is high, and the distance from practical application is large; in addition, the electrochemical oxidation technology proposed by some scholars in recent years has strong oxidation and The simple process and no secondary pollution have attracted widespread attention, but it has certain limitations in application: there are not many types of electrodes, especially the lack of efficient and cheap electrodes, and the life of the electrodes is not long, energy consumption is large, and the cost is high

In addition, the solid waste that is oxidized and degraded by this method can be incinerated to remove the organic matter, and the remaining metal oxide residue can be reused in the catalyst, which can save costs and achieve recycling of solid waste. However, , one of the biggest weaknesses of this patent is that its cathode has not been effectively paid attention to

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