Device and method for coupling electrocatalytic membrane and three-dimensional electrode to treat refractory wastewater

Abstract

An embodiment of the invention provides a device and a method for treating refractory wastewater by coupling an electrocatalytic membrane with a three-dimensional electrode. The device mainly comprises a Ti4O7 / Ti filter element anode, a water-permeable separation mesh, a graphite felt cathode, C@Fe3O4 particles, an aeration pipe and a current-stabilized and voltage-stabilized power supply; and the device is in the shape of a cylinder on the whole, the Ti4O7 / Ti filter element anode is fixed at the center of the bottom of the device and a layer of water-permeable separation mesh wraps the surface of the anode, the graphite felt cathode clings to the inner wall of the cylinder, the aeration pipe is placed at the bottom of the device and beside the graphite felt cathode, the C@Fe3O4 particles fill the space between the water-permeable separation mesh and the graphite felt cathode to form the three-dimensional electrode, the graphite felt cathode and the Ti4O7 / Ti filter element anode are connected with a negative electrode and a positive electrode of the current-stabilized and voltage-stabilized power supply, respectively, and organic matter in the wastewater is degraded by a constant-current operation mode. In the device and the method provided by the invention, the Ti4O7 / Ti filter element anode is coupled with the C@Fe3O4 three-dimensional electrode system to enhance the treatment effect on refractory pollutants, and through the synergistic effect of the cathode and the anode, the efficiency of the system for oxidizing pollutants is improved, and the energy consumption for wastewater treatment is reduced.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a device and method for coupling an electrocatalytic membrane and a three-dimensional electrode to treat refractory wastewater. Background technique [0002] The chemical structure of refractory pollutants is stable, and most of them have certain biological toxicity. They will accumulate in the environment and enrich in organisms, eventually endangering human beings. Due to the biological toxicity of refractory pollutants, the effect of traditional biological treatment technology is poor, and advanced oxidation technology, because it can generate free radicals with strong oxidizing ability, has unique advantages in the treatment of refractory pollutants. [0003] Electrocatalytic membrane technology is one of the advanced oxidation technologies. It combines electrochemical catalytic oxidation with membrane filtration. The porous membrane has a large specific surface ...

AI Technical Summary

Problems solved by technology

[0008] The disadvantages of a method of using titanium dioxide to make electrode materials for wastewater treatment in the above-mentioned prior art are: the preparation process of titanium dioxide film electrodes is complicated, the cost is high, and the ratio of the specific surface area with electroactivity to the total specific surface area Low (2% ~ 8%), therefore, there are still some difficulties in the practical application of this titanium oxide film electrode

[0009] In addition, most catalytic oxidation processes use the anode to react, and a few use the electron donating effect of the cathode (CN201310279516.X, CN201310311041.8), but basically use the effect of a single electrode, and the other electrode is used as an auxiliary electrode. Give full play to the role of auxiliary electrodes

In the presence of oxygen, the cathode will undergo a reduction reaction of oxygen to generate hydrogen peroxide when it is energized. Hydrogen peroxide is also an oxidizing substance that can assist in the oxidation of pollutants in water, but the traditional two-dimensional electrode has a mass transfer effect. Poor and low current efficiency

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