Micro-electrolysis + Fenton process for treating high-concentration chemical wastewater

The reaction mechanism of iron-carbon microelectrolysis involves placing iron chips (mainly composed of iron and carbon) in acidic wastewater. Due to the potential difference of 1.2V between Fe and C, a large number of microbattery systems are formed in the wastewater. The reaction products of the microbattery have adsorption and filtration effects, thereby reducing the pollutants in the wastewater. During the microelectrolysis process, the anode is oxidized to produce Fe and Fe3+, which undergoes hydrolytic precipitation to form flocculants with adsorption properties. Meanwhile, the [H] and [O] generated at the cathode continue to undergo oxidation reactions, degrading macromolecular organic compounds in the wastewater and improving its biodegradability. During the reaction process, OH is generated at the cathode, increasing the pH value of the treated wastewater.
The Fenton reaction involves adding H2O2 after the iron-carbon microelectrolysis reaction, where Fe2+ reacts with H2O2 to form the Fenton reagent oxidation system. Since H2O2 is catalytically decomposed by Fe2+ to produce OH˙ (hydroxyl radical), with an oxidation electrode potential of approximately 2.8V, the Fenton reagent exhibits strong oxidizing ability, capable of oxidizing and decomposing refractory organic matter in wastewater into small organic molecules and inorganic substances, thus achieving the degradation of organic matter.
Neutralization and precipitation involves adjusting the pH value of the acidic effluent from the micro-electrolysis Fenton system to around 8, while adding a coagulant, to remove suspended solids and other precipitates from the wastewater. When treating chemical wastewater, the neutralization and precipitation process can not only independently remove pollutants from the wastewater but also serve as an intermediate step to enhance the treatment efficiency of the wastewater.