The Fenton reactor uses the Fenton electrochemical reaction. When iron-carbon contacts the electrolyte solution, a primary cell with iron-carbon as the two poles is formed. The carbon pole has a high potential and is the cathode, while the iron pole has a low potential and is the anode.
In wastewater treatment, electrochemical corrosion can proceed freely. Since the continuous generation of Fe2+ can effectively overcome the polarization of the anode, it promotes the electrochemical reaction of the entire system, allowing a large amount of Fe to enter the solution, which has a high electrochemical reduction activity.
The new ecology produced by the electrode reaction can undergo redox reactions with many components in the solution. At the same time, iron is an active metal, and its reducing ability can reduce certain components.
The Fenton reactor can improve the biodegradability of sewage by oxidation. Fenton reagent is a commonly used catalytic reagent. When the pH value is low enough, hydrogen peroxide will decompose to produce OH- under the catalytic action of ferrous ions, thereby triggering a series of chain reactions. The role of Fenton reagent in water treatment mainly includes the oxidation and coagulation of organic matter.
Fenton oxidation: The reason why Fenton reagent has a very high oxidation ability is that the decomposition activation energy of H2O2 under the catalysis of Fe2+ ions is low (34.9KJ/mol), and it can decompose to produce hydroxyl radicals OH-.
Compared with some other oxidants, hydroxyl radicals OH- have a higher oxidation electrode potential, and therefore have strong oxidation performance. Factors affecting the treatment of refractory organic wastewater by Fenton reagent According to the above-mentioned Fenton reagent reaction mechanism, OH- is an effective factor for oxidizing organic matter, and [Fe2+], [H2O2], and [OH] determine the output of OH-, and thus determine the degree of reaction with organic matter.
Fenton filtration, adsorption and coprecipitation: The internal electrolytic reaction column composed of iron filings and carbon particles has a good filtration effect. The colloid generated by the reaction can not only enhance the filtration and adsorption effect, but also produce new colloid particles. The central colloid core is composed of many Fe(OH) polymers with a huge specific surface.
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