In the field of wastewater treatment, the removal rate of organic pollutants is one of the important indicators to measure the effect of wastewater treatment. Due to the wide variety of wastewaters and their different properties, wastewater treatment methods are also varied. The chemical treatment of wastewater requires the addition of oxidants, flocculants and other chemicals, which requires large equipment, large footprint, complicated follow-up treatment and high cost; biological treatment technology can only treat biodegradable substances in wastewater, so it can only remove organic pollution in wastewater. matter and chromaticity. Electrochemical treatment of wastewater generally does not need to add chemicals, the equipment is small in size, less occupied, simple and flexible in operation, less sludge, and very simple in post-treatment. It is usually called an environmentally friendly cleaning treatment method. Electrochemical method is more effective in the field of wastewater treatment and has a wider range of applications.
Electrooxidation utilizes the high potential of the anode to degrade toxic compounds in solution. Electrooxidation can be divided into direct oxidation and indirect oxidation. In the electroplating industrial wastewater, CN- can be directly oxidized by the titanium electrode, and the direct oxidation also has the functions of desulfurization and sterilization. Indirect oxidation is that in the process of titanium anode reaction, chemically active substances with strong oxidizing properties are preferentially formed, and then these substances are used to oxidatively decompose refractory substances. Ag2+, CO3+ and Fe3+ can all be used as oxidation intermediates of organics. Indirect oxidation has been shown to be effective in the oxidation of benzene, phenol, oils and chlorides.
Electrochemical treatment methods include electrochemical redox, electrocoagulation, electroflotation, photoelectrochemical oxidation, internal electrolysis, and the like. The application of electrochemical method in wastewater treatment mainly includes the removal and recovery of heavy metals, the treatment of refractory organic wastewater, the sterilization and disinfection of drinking water, and the combined use of other methods.
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