In-situ adsorption and electrocatalysis coupled organic wastewater treatment system and method

A technology for organic wastewater treatment and electrocatalysis, applied in the fields of adsorption water/sewage treatment, magnetic field/electric field water/sewage treatment, water/sewage treatment, etc., can solve the problems of waste, low apparent catalytic efficiency, etc., and prolong the service life. , The effect of improving electrocatalytic degradation performance and low energy consumption

Active Publication Date: 2017-02-22
XI AN JIAOTONG UNIV
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Problems solved by technology

It can be seen that the key factor limiting the electrocatalytic oxidation performance of the electrode is: due to the restriction of the mass transfer process, the adsorbed OH on the surface of the electrode cannot fully contact with the organic molecules, and a large amount of OH is wasted due to the recombination reaction of free radicals, which eventually leads to its The apparent catalytic efficiency is low

Method used

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  • In-situ adsorption and electrocatalysis coupled organic wastewater treatment system and method
  • In-situ adsorption and electrocatalysis coupled organic wastewater treatment system and method

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Experimental program
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Effect test

Embodiment 1

[0037] Embodiment 1: Non-attraction type, that is, the electromagnetic field is always disconnected. In this state, due to the agitation in the electrolytic cell, the adsorbent particles are in a fluidized state and suspended in the solution to be treated. At this time, the adsorbent particles will adsorb the organic molecules in the solution to be treated, and then the mass transfer process of the organic molecules from the solution body to the electrode surface is completed through the collision between the adsorbent particles and the electrode surface in a fluidized state. When the electrocatalytic electrode is energized, the organic molecules brought by the adsorbent molecules to the electrode / solution interface undergo an oxidation reaction with the OH on the electrode surface to complete the degradation process.

Embodiment 2

[0038] Embodiment 2: direct attraction type, that is, the electromagnetic field of the electromagnet always exists or a permanent magnet is used. The magnetic adsorbent particles are always adsorbed on the surface of the electrode, forming a transitional electrode system (2.5-dimensional system) between the 2-dimensional and 3-dimensional systems. In this case, the adsorbent particle layer on the electrode surface will greatly expand the actual surface area of ​​the electrode, thereby creating an enrichment field of organic molecules between the electrode surface and the solution body, so that the organic molecules are continuously released from the solution body. Migration enrichment towards the electrode surface. When organic molecules continuously enter the interface, the probability of contact reaction between the surface adsorbed OH and organic molecules increases, the utilization rate of OH increases, the side reaction of oxygen evolution is suppressed, the current effic...

Embodiment 3

[0039] Embodiment 3: Pulse attraction type, that is, the electromagnetic field of the electromagnet is switched on and off at a certain frequency, so that the magnetic adsorbent travels back and forth between the solution body and the electrode surface at the same frequency. When the electromagnetic field is disconnected, the magnetic adsorbent detaches from the electrode surface. Due to the stirring effect in the electrolytic cell, the adsorbent particles are in a fluidized state and suspended in the solution to be treated. At this point, the adsorbent particles will adsorb the organic molecules in the solution to be treated. When the electromagnetic field is turned on, the magnetic adsorbent particles are adsorbed on the electrode surface. At this time, the adsorbent particles will release the organic molecules adsorbed in the solution body due to the influence of the acidic environment on the electrode surface, completing the desorption and regeneration process. The organi...

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Abstract

The invention discloses an in-situ adsorption and electrocatalysis coupled organic wastewater treatment system, comprising an electrolytic cell, an electrocatalytic anode and an electrocatalytic cathode; the electrocatalytic anode is a hollow rod arranged in the center of the electrolytic cell, a wire wound conductor is placed in a cavity of the electrocatalytic anode, and two ends of the conductor are connected to an electromagnetic field power supply; the electrocatalytic anode and the electrocatalytic cathode are connected to a negative pole and positive pole of the electromagnetic field power supply; the electrocatalytic cathode is tubular in shape and arranged on the inner wall of the electrolytic cell and surrounds the electrocatalytic anode therein; a solution containing organic molecules to be treated is provided between the electrocatalytic anode and electrocatalytic cathode of the electrolytic cell, and the solution contains a plurality of magnetic adsorbent particles. By using the magnetic adsorbent particles with electromagnetic field control, the positions of the magnetic adsorbent particles in the solution can be controlled, mass transfer in electrocatalytic oxidation process is accelerated, the ability to enrich organics is improved, and the electrocatalytic degrading performance of the adsorbent is improved.

Description

technical field [0001] The invention belongs to the field of electrochemical water treatment, and in particular relates to the construction of an in-situ adsorption-electrocatalysis coupled treatment system. Background technique [0002] As a new type of refractory biodegradable wastewater treatment technology, electrocatalytic oxidation wastewater treatment technology has received more and more attention and attention from researchers (Applied Catalysis A: General, 2014, 480: 58; Environ.Sci.Pollut., 2014, 21:8493; Chemical Society reviews, 2011, 40:3879). There are two main treatment mechanisms of this technology: 1) Direct catalytic oxidation: The organic matter directly exchanges electrons with the electrode surface oxide on the electrode surface, and then undergoes a redox reaction, changing the molecular structure of the organic matter to achieve the purpose of harmlessness or mineralization ( Journal of Xi'an Jiaotong University, 2016,50(5):134); 2) Indirect catalyti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/12
CPCC02F9/00C02F1/48C02F1/4672C02F1/725C02F1/28C02F2001/46133
Inventor 徐浩冯江涛延卫李晓良
Owner XI AN JIAOTONG UNIV
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