Environmentally friendly water treatment catalytic oxidation

Description:
Basic principle: Fenton reagent is composed of ferrous salts (such as ferrous sulfate) and hydrogen peroxide. Under acidic conditions, ferrous ions (Fe ² ⁺) catalyze the decomposition of hydrogen peroxide (H ₂ O ₂), producing highly oxidizing hydroxyl radicals (· OH) with an oxidation potential of up to 2.8V, which can almost oxidize all organic compounds. Hydroxyl radicals oxidize and decompose organic compounds into small molecules through electron transfer and other pathways, and even completely mineralize them into carbon dioxide and water.

Main types:

Ordinary Fenton method: H ₂ O ₂ decomposes under the catalytic action of Fe ² ⁺ to produce · OH, while Fe ² ⁺ is oxidized to Fe ³ ⁺ to produce coagulation precipitation, removing a large amount of organic matter. This method can degrade organic matter in the dark, but the utilization rate of H ₂ O ₂ is not high and cannot fully mineralize organic matter. Light Fenton method: including UV/Fenton method and UV vis/complex/H ₂ O ₂ method. The UV/Fenton method is a combination of ordinary Fenton method and UV/H ₂ O ₂ system, which reduces the amount of Fe ² ⁺ and improves the utilization rate of H ₂ O ₂. However, the solar energy utilization rate is still not high, the energy consumption is high, and the treatment equipment cost is high. The UV vis/complex/H ₂ O ₂ method introduces substances with high photochemical activity, such as oxalate and citrate complexes containing Fe ³ ⁺, which improves the utilization of solar energy and saves H ₂ O ₂ usage. It can be used to treat high concentration organic wastewater. Electric Fenton method: using H ₂ O ₂ and Fe ² ⁺ generated by electrochemical method as a continuous source of Fenton reagent. Including EF Fenton method (cathodic electrolysis Fenton method) and EF Feox method (sacrificial anode method). The EF Fenton method does not require the addition of H ₂ O ₂, resulting in complete degradation of organic matter. However, the current generated by the cathode material under acidic conditions is small, and the H ₂ O ₂ production is not high; The EF Feox method generates Fe ² ⁺ through anodic oxidation and undergoes Fenton reaction with added H ₂ O ₂. The Fe ² ⁺ and Fe ³ ⁺ dissolved from the anode can be hydrolyzed into Fe (OH) ₂ and Fe (OH) I3, which have coagulation properties, but require the addition of H ₂ O ₂, resulting in high energy consumption and cost.