Electrochemical reactor and method for electrocatalytic removal of chloride ions

Abstract

An electrochemical reactor and a method for electrocatalytically removing chloride ions, which relate to the technical field of wastewater treatment. The anode in the electrochemical reactor is made of a mesh basket made of refractory metal, and Ru-Ti filled in the mesh basket. ‑AC catalytic material is composed of carbon rods or metal wires drawn from the middle of the anode and connected to the positive electrode of the power supply; the cathode is composed of multiple metal plates or metal meshes arranged at intervals, and the distance between two adjacent metal plates or metal meshes is 4 ~6cm, the cathode is connected to the negative electrode of the power supply through a wire. This electrochemical reactor has high electrolysis efficiency and high degradation rate of chloride ions. The electrocatalytic method of removing chloride ions is carried out using this electrochemical reactor, and the wastewater to be treated is It is introduced into the reaction tank of the electrochemical reactor, submerges the anode and cathode, applies a constant current between the anode and cathode, continuously stirs the wastewater, and reacts for 0.1 to 2 hours. This method is easy to operate and is conducive to large-scale industrial application.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, and in particular to an electrochemical reactor and a method for electrocatalytically removing chloride ions. Background technique [0002] With the development of my country's economic construction, the demand for water resources has increased sharply, and at the same time, the situation of water pollution has become more and more serious. In such a water environment, people pay more and more attention to water pollution treatment technology. In wastewater, COD (Chemical Oxygen Demand, chemical oxygen demand), BOD (Biochemical Oxygen Demand, biochemical oxygen demand), nitrogen The removal technologies of pollutants such as , phosphorus, and heavy metals have been greatly developed. Since the chloride ions in industrial wastewater are not used by microorganisms, there are relatively few related removal technologies. my country's "Comprehensive Wastewater Discharge Standard (GB8978-...

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Problems solved by technology

But at present, this technology is still in the laboratory stage, and it is rarely industrialized. The main reason is that there are still some limitations in the electro-adsorption technology: ① In order to ensure that the electrodes have good conductivity, the electrodes used in the electro-adsorption technology are very thin. The thickness of the electrode is generally about 1-4mm, which is inconvenient for industrial operation; ②When the electrode is made of ordinary adsorbent material, the adsorbent material is made into a piece of plate, the total specific surface area cannot be large, and the adsorption effect is not obvious; ③Electrode material Its own performance seriously affects the effect of electro-adsorption technology, and it is difficult for ordinary electrode materials to meet the requirements of high specific surface area, high conductivity, and high cost performance at the same time; ④The concentration of chloride ions in wastewater that can be treated by electro-adsorption technology is far lower than that in industrial wastewater The actual concentration, so it cannot provide good technical support for industrialization

This invention has the following defects: 1. the whole anode of this invention does not use an effective chloride ion oxidation catalyst, and it can be seen that this invention does not electrochemically oxidize chloride ions into Chlorine gas is removed, but only the chlorine ions are adsorbed and concentrated on the activated carbon through the positive charge and the adsorption of activated carbon to achieve the purpose of removing chlorine ions, but not every surface of activated carbon touches the anode titanium plate all the time. That is to say, not every activated carbon surface is positively charged, so the electrosorption efficiency of the whole device is not very high.

And activated carbon adsorption capacity is limited, is easy to saturation, so it is difficult to remove the chlorine ion waste water of high concentration, finds out by embodiment, the chloride ion concentration of its test solution is only 1000mg / l, and its electric adsorption time is too long, needs 2 If the concentration of chlorine ions in the wastewater is too high, a large amount of activated carbon will inevitably be used when using this method to treat chloride ion wastewater, and the treatment time will be longer

② Metal titanium is easy to passivate when it is energized for a long time in an acidic environment, the surface resistance increases, and the electrical efficiency decreases, which has a great impact on the transfer of positive charges on the electrode surface

Moreover, the anode titanium plate of this invention is a plate electrode, no matter how it is arranged, the surface area of ​​the anode will be limited, the surface area cannot be very large, and the anode electrolysis efficiency cannot be very high

The above defects limit the large-scale application of this method in the actual treatment of wastewater.

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