The electro-catalytic oxidation process used in electro-catalytic oxidation equipment is very mature, which is widely used in the treatment of various high-concentration refractory wastewater such as chemical oil fields, electroplating wastewater, papermaking wastewater and printing and dyeing wastewater. The treatment effect is good, and the initial investment and later operation cost are very low. For the details of the specific wastewater treatment system of electro-catalytic oxidation, let us know the technical principle and characteristics of the electro-catalytic oxidation wastewater treatment system:

First, the principle of electrocatalytic oxidation technology

(1) electrolytic flocculation

? Soluble anodes, such as iron and aluminum, are energized with direct current, and the anode loses electrons to form metal cations Fe2+ and Al3+. After a series of hydrolysis, polymerization and oxidation processes, a high-activity adsorption flocculation group is formed, which has strong adsorption ability and makes colloidal impurities and suspended impurities in water coagulate, precipitate and separate. At the same time, charged pollutant particles swim in the electric field, and some of their charges are neutralized by the electrode, which makes them unstable and aggregate. Its flocculation effect is better than that of ordinary flocculant.

(2) electrolytic oxidation

? Under the action of DC electric field, various pollutants in wastewater directly lose electrons at the anode of the electrode plate and undergo oxidation reaction. At the same time, anions with lower electrode potential in solution, such as OH- and Cl-, lose electrons on the anode surface, generating new strong oxidant active substances, such as [O], [OH] and ClO-. These active substances are used to oxidize and decompose BOD5 and COD in water.

(3) electrolytic reduction

? In the process of wastewater electrolysis, the cations in pollutants first get electrons at the cathode, so that the high-valence or low-valence metal cations in the electrolyte get electrons at the cathode and are directly reduced to low-valence cations or metal precipitates.

(4) electrolytic air flotation

? Electrolytic air flotation is the electrolysis of wastewater. The ionization of water molecules produces H+ and OH-, which are driven by electric field to migrate directionally, and hydrogen and oxygen are precipitated on the surface of cathode plate and anode plate respectively. The diameter of newly generated bubbles is very small, about 10 ~ 30μ m, and the dispersion of bubbles is very high. As carriers, they attach to the suspended solids in water and float, thus removing pollutants and impurity particles.

Second, the technical characteristics of electro-catalytic oxidation wastewater treatment system

(1) Low investment cost and low operating cost. The power consumption for treating tons of water and electricity is about 0. 15-0.5 degrees/ton of water.

(2) No chemical agents need to be added.

(3) Small floor space, simple operation and high degree of automation.

(4) The equipment has short processing time and high processing efficiency.

(5) It is applicable to a wide range of wastewater and can treat various pollutants.

(6) The amount of sludge produced by equipment treatment is small and the sludge density is high.