Comparison of Electrocatalytic Oxidation and Common Chemical Catalysis in Water Treatment
Electrocatalytic oxidation is a kind of electrochemical water treatment technology, which belongs to electrocatalytic advanced oxidation technology. In conventional chemical catalysis, electron transfer between reactants and catalysts takes place within a defined area. Therefore, in the reaction process, electrons can neither be fed in from the external circuit, nor can electrons be derived from the reflecting system or currents can be obtained. In the electrocatalytic reaction, the transfer of electrons can be pure electron transfer, and the electrode acts as a heterogeneous catalyst with dual functions of catalyzing chemical reactions and transferring electrons.
In the conventional common chemical catalytic reaction, the electron transfer process cannot be controlled from the outside; in the electrocatalytic reaction process, the reaction process occurs directly in the electrocatalytic oxidation electrolyzer, and the external loop can be used to control the ultra-high pressure, so as to Control the reaction speed, reaction conditions, etc. The output current can be used to measure the speed of the reaction. For the electrolysis reaction, by changing the electrode potential, the direction of the oxidation and reduction reactions can be controlled.
The technical characteristics of electrocatalytic oxidation method:
1. Environmentally friendly: no additional redox agents are required, the electrolysis reaction is carried out between the electrode and the wastewater, and the hydroxyl radicals generated in the process directly react with the organic matter in the wastewater to degrade into carbon dioxide and water or simple low molecular weight Organic matter, no secondary precipitates and pollution problems;
2. Strong controllability: the reaction conditions are mild, the electrolysis efficiency is high, and the electrolysis reaction cell device and operation are relatively simple and controllable.
3. Multiple functions: In addition to the degradation of COD and ammonia nitrogen, if the wastewater contains heavy metal ions, the anode and the cathode act at the same time, and the heavy metal ions are electrodeposited on the cathode to improve the treatment efficiency, and also decolorize, Adsorption also has a certain effect on algae and fungi.
4. The treatment method is flexible: it can be treated as a separate module, it can be placed in the pretreatment stage to improve the biodegradability of wastewater, or it can be placed in the subsequent deep stage for further deep blowing of refractory organic matter, or it can be It can be combined with other methods to achieve the ideal processing effect.
Application of electrocatalytic oxidation method in water treatment:
At present, the electrocatalytic oxidation method is suitable for various organic wastewater treatment, hydrocarbon-containing wastewater, Aldehyde wastewater, phenolic wastewater, amine wastewater, printing and dyeing wastewater, chromium-containing wastewater, landfill leachate, municipal wastewater, spray tower wastewater, oil field wastewater and other fields are a kind of advanced oxidation technology with great potential, especially in recent years. With the increasing requirements of environmental protection in recent years, there is a great market space and application prospect in the pretreatment and advanced treatment of organic wastewater.