Method and device for electrochemically degrading organic waste water by taking activated charcoal basket as anode

Abstract

The invention discloses a method and a device for electrochemically degrading organic waste water by taking activated charcoal basket as anode. The process can be used for treating coking waste water (or other organic waste water) by combining a physical adsorption concentration method and an electrochemical catalytic oxidation method; and various organic pollutants such as ammonia nitrogen, phenol and cyanogen in the coking waste water (or other organic waste water) can be effectively and thoroughly removed. Furthermore, the method can be used for greatly reducing the treatment cost of the coking waste water (or other organic waste water), is low in price and simple in operation and equipment, and can run in a circulating way, thus having great practical application value.

Description

technical field [0001] The invention belongs to the technical field of waste water treatment, specifically a degradation process for organic pollutants in waste water, and relates to a method and device for advanced treatment of refractory organic waste water, in particular to an activated carbon basket used as an anode for electrochemically assisted catalytic oxidation degradation of coking waste water (or other organic wastewater) method and device. Background technique [0002] Coking wastewater is the wastewater generated during the process of coal coke, gas purification and coking product recovery. The chemical composition is very complex, containing a large amount of ammonia nitrogen, sulfide, cyanide and a variety of biologically toxic organic pollutants. It has high chroma, high toxicity and is difficult to be biodegraded. At present, the treatment of coking wastewater in various countries at home and abroad is facing severe problems, the treatment is difficult, and...

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Problems solved by technology

The 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 biodegraded

At present, the treatment of coking wastewater in various countries at home and abroad is facing severe problems, the treatment is difficult, and the quality of effluent water 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 coking wastewater, but each has its own advantages and disadvantages. The COD and ammonia nitrogen in the effluent and chromaticity are still not satisfactory, it is difficult to meet the national emission standards

In the current coking wastewater treatment process, the equipment and treatment methods used either occupy a large area, or are complex in operation, low in treatment efficiency, high in energy consumption, or high in cost, have secondary pollution, or have poor comprehensive recycling effects, such as: Although the biological oxidation method is low in cost, 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 strong adsorption capacity due to its rich pore size distribution and large specific surface area. Although it can remove COD well, it is easy to be saturated, 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; although the photocatalytic oxidation method can degrade organic substances that are difficult to biodegrade, However, the operation is complex, the treatment efficiency is very low, the energy consumption is high, and the distance from the actual application is large; in addition, the electrochemical oxidation technology proposed by some scholars in recent years has attracted widespread attention because of its strong oxidative properties, simple process, and no secondary pollution. 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, the energy consumption is large, and the cost is high

However, the electrolysis voltage of this reactor is relatively high, and the stainless steel material used in the anode corrodes quickly under the action of direct current electrolysis, and it is easy to agglomerate and channel with the filled catalyst particles, or the entire micro-electrolysis area is blocked, so not only Frequent replacement of electrode materials is required, which affects the continuous and efficient treatment of coking wastewater, and the operation process is complex and costly