Low-energy-consumption electrochemical treatment device and method for degradation-resistant organic wastewater

Abstract

The invention relates to an electrochemical treatment device and method for degradation-resistant organic wastewater, and designs a'zero polar distance' SPE (Solid Polymer Electrolysis) electrooxidation sewage treatment electrolytic bath like a solid polymer electrolyte fuel cell technology. According to the device, an anode chamber and a cathode chamber are separated by utilizing an ion exchange membrane, the anode with stable titanium-based size, the ion exchange membrane and the nickel cathode are pressed by utilizing an end plate, and a'zero polar distance' SPE electrooxidation sewage treatment electrolytic bath is formed. When the device is subjected to electrolytic operation, the wastewater is electrically oxidized at the anode, so that organic matters and ammonia nitrogen in the water are mineralized and degraded; and running water or the wastewater is introduced into the cathode chamber, and hydrogen separated out due to electrolysis at the cathode is recovered. The device has the advantages that extra supporting electrolyte is not needed to be added, the bath pressure and energy consumption of electrooxidation can be greatly reduced due to the'zero polar distance', and the problem that oxygen (chlorine) and hydrogen separated out in the electrolysis process is solved. In addition, a carbon material is not used, reduction of current efficiency caused by carbon corrosion is avoided, and the reliability and stability of the sewage treatment device are improved. Moreover, continuous water flow is utilized at the cathode, and the scaling and plugging possibility on the cathode side of the ion exchange membrane can be greatly reduced.

Description

technical field [0001] The invention relates to the technical field of water treatment industry in the field of environmental protection, in particular to a device and method for electrochemically treating refractory organic wastewater with low energy consumption. Background technique [0002] Water pollution is becoming more and more widespread, the composition of pollutants is more and more complex, and the nature is changeable, which seriously threatens the ecological environment and human health and safety. Many industrial wastewaters, such as coking, dyes, pharmaceuticals, organic chemical synthesis / papermaking, steel, metal processing and other industrial wastewater and landfill leachate, have the characteristics of high toxicity, high concentration and difficult biodegradation, and it is very difficult to treat them. Advanced water treatment technology is difficult to obtain satisfactory treatment effect on such sewage. Electrochemical advanced oxidation technology i...

AI Technical Summary

Problems solved by technology

However, there are many problems in the current electrochemical method: during the water treatment process, the volatilization of the wastewater is high, and the water yield is low; the distance between the electrodes is large, resulting in high pressure in the electrolytic cell and high energy consumption; while the wastewater is being treated, the cathode and anode will separately analyze chlorine. Oxygen and hydrogen evolution, the two gases in the traditional electrolyzer are prone to mixing, which poses a great safety hazard; in the process of wastewater treatment, in order to increase the conductivity of the wastewater, reduce the pressure and energy consumption of the electrolyzer, it is often necessary to add supporting electrolytes to the wastewater, which It not only increases the chemical cost of water treatment, but the treated water needs to continue desalination

[0004] 2. It is necessary to use expensive Pt as the cathode catalyst, which increases the cost of the reactor;

[0005] 3. The cathode of the electrolytic cell is a gas diffusion electrode, and there is no water flowing through it, so it is easy to generate cation Ca 2+ , Mg 2+ isoalkaligenic (such as Ca(OH) 2 , Mg(OH) 2 etc.) fouling to block the electrode, long-term operation will increase cathode polarization and energy consumption, and reduce cathode life

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