Three-dimensional electrochemical-ozonation coupling treatment device for wastewater difficult to treat, and wastewater treatment method

Abstract

The invention relates to the technical field of wastewater treatment, in particular to a three-dimensional electrochemical-ozonation coupling treatment device for wastewater difficult to treat, and a wastewater treatment method. The device comprises a three-dimensional electrochemical-ozonation coupling reactor, and the three-dimensional electrochemical-ozonation coupling reactor comprises a reactor tank body; and a cathode and an anode which are connected with each other through a direct-current power supply are arranged in the reactor tank body, a particle electrode is also filled in the reactor tank body, the particle electrode is positioned between the cathode and the anode, a microbubble ozone distributor is arranged at the bottom of the reactor tank body, and the microbubble ozone distributor is connected with an ozone generator. The method comprises the following steps: after being subjected to electric flocculation and primary filtration, wastewater difficult to treat enters the three-dimensional electrochemical-ozone coupling reactor and is treated. The particle electrode is filled between the cathode and the anode, so that the mass transfer effect under the electrifying condition is improved, and the current efficiency, the electrochemical reaction rate and the treatment effect of the wastewater treatment method adopting the device are greatly improved.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a three-dimensional electrochemical-perozone coupling treatment device and a wastewater treatment method for refractory wastewater. Background technique [0002] A large number of research and production practices have shown that the tail water after biochemical treatment still cannot meet the discharge standards in chemical companies such as oil and gas production, petrochemical, pharmaceutical, printing and dyeing, and the main organic pollutants contained in the tail water are soluble refractory organic compounds. , such as organic compounds containing aromatic rings. Removing organic pollutants in tail water, reducing tail water chemical oxygen demand (COD) and total nitrogen (TN) is an important content of wastewater treatment. [0003] Fenton method, catalytic ozone oxidation method, perozonation oxidation method, and photocatalytic oxidation are commonly used...

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Problems solved by technology

[0005] Aiming at the technical problem of low time-space efficiency of the existing electrochemical method for treating wastewater, the present invention provides a three-dimensional electrochemical-perozone coupling treatment device and a wastewater treatment method for refractory wastewater. The cathode of the three-dimensional electrochemical-perozone coupling treatment device of the present invention Particle electrodes are filled between the anode and the anode. When the electricity is applied, the particle electrodes will be polarized to form countless microelectrodes. The distance between the electrodes will be significantly reduced, the contact area between the electrodes and the ozone will increase, the mass transfer effect will be greatly improved, and a three-dimensional microelectrode will be formed. The coupling of electrochemistry and electro-ozone, using cathodic electrolysis reaction (O 2 +2H + +2e→H 2 o 2 ) produced H 2 o 2 And the alkaline environment around the cathode surface is just conducive to the ozone reaction (2H 2 o 2 +2O 3 →·OH+H 2 O+3O 2 +HO 2 ·) Generate non-selective strong oxidizing hydroxyl radicals (·OH)

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