Wastewater treatment technologies include sedimentation, filtration, flocculation, biodegradation, and electrolytic oxidation. When the electrolytic method is used to treat wastewater, the electrode not only plays the role of transmitting electric current but also plays a catalytic role in the oxidative degradation of organic matter without causing secondary pollution. It is called green water treatment technology. For wastewater that cannot be treated with biodegradation, electrolytic oxidation often has significant effects. Therefore, electrolytic water treatment technology has become a research hotspot in water treatment technology and has been used more and more widely. The basic principle of electrolytic water treatment technology is to make pollutants undergo direct electrochemical reactions or indirect electrochemical conversion on electrodes, that is, direct electrolysis or indirect electrolysis.
(1) Direct electrolysis refers to the removal of pollutants directly from the wastewater by oxidation or reduction on the electrodes. Direct electrolysis can be divided into an anode process and a cathode process. The anodic process is the oxidation of pollutants on the surface of the anode to convert them into less toxic substances or easily biodegradable substances, and even the inorganization of organic substances, so as to achieve the purpose of reducing and removing pollutants. The cathodic process is the reduction and removal of pollutants on the surface of the cathode. It is mainly used for the reduction and dehalogenation of halogenated hydrocarbons and the recovery of heavy metals.
(2) Indirect electrolysis refers to the use of electrochemically produced redox substances as reactants or catalysts to convert pollutants into substances with less toxicity. Indirect electrolysis is divided into reversible processes and irreversible processes. The reversible process (medium electrochemical oxidation) refers to the electrochemical regeneration and recycling of redox compounds in the electrolytic process. Irreversible process refers to the process of oxidizing organic matter such as chlorate, hypochlorite, H2O2, and O3, which are produced by an irreversible electrochemical reaction, and it can also use an electrochemical reaction to produce strong oxidizing intermediates. , Including solvated electrons, HO, HO2, O2- and other groups.
The new technology of electrolytic water treatment has no need to add chemicals, has a small equipment size, small footprint, and no secondary pollution, and has been used to treat wastewater containing organic pollution such as hydrocarbons, alcohols, aldehydes, ethers, and phenols. The removal of COD mainly depends on the oxidation reaction on the anode surface, which directly oxidizes and degrades the organic matter on the anode surface, so that the organic matter in the sewage is directly or indirectly converted into CO2 and water through electrochemical conversion. The anode potential must be higher than the decomposition potential of the organic matter, so the organic oxide oxidation and oxygen evolution of two competing reactions take place on the anode. The shape of the anode is available in various forms such as plate type, tube type, and mesh type, which can be selected by users, and the quality is reliable. The titanium matrix is reusable.
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