FCDI device for enhancing trace ion trapping, based on ion exchange resin, and application thereof

Abstract

The invention relates to an FCDI device for enhancing trace ion trapping, based on ion exchange resin, and the application thereof. The FCDI device adopts the technical scheme that the FCDI device comprises an electric adsorption module unit, an electric desorption ion recycling module unit, fluid electrode, a fluid electrode conveying unit, a voltage supply unit, a diluting compartment and a concentrating compartment, the electric adsorption module unit is positioned in the diluting compartment; the electric desorption ion recycling module unit is positioned in the concentrating compartment;the electric adsorption module unit comprises an ion exchange resin bed, a cathode graphite collector plate I, an anode graphite collector plate II, an anion exchange membrane I, a cation exchange membrane I, a cathode electrode chamber I and an anode electrode chamber I. By adding the ion exchange resin bed in the electric adsorption module unit, the FCDI device optimizes the process of deionization performed on low-concentration inlet water by an FCDI system, weakens the concentration polarization effect, and enhances the electricity removal rate.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering and water treatment, and in particular relates to an ion exchange resin-based enhanced trace ion trapping FCDI device and its application. Background technique [0002] An electro-adsorption desalination technology derived from electrochemical principles, also known as capacitive deionization technology (CDI), has the ability to avoid the problems of the above desalination technologies because of its simplicity, low energy consumption, and environmental friendliness. more and more people's attention and attention. The basic principle of this technology is that by applying an external voltage to the porous adsorption electrode, an electrostatic field is formed between the two electrodes, and the charged ions are forced to move to the electrode with the opposite charge under the action of the electrostatic field. The negative and positive ions in the solution move to the positive ...

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Problems solved by technology

[0006] However, there are still some deficiencies in FCDI technology at present: although the applied electric field is lower than the electrolysis voltage of water, there is a phenomenon that the local current inside the electrode chamber is higher than the limiting current. Causes a weak concentration polarization effect, which leads to a decrease in efficiency

During the long-term operation of the reactor, the concentration difference of calcium and magnesium ions in the influent may even cause scaling of the ion exchange membrane in some cases. These phenomena are one of the factors that cause the low efficiency of FCDI technology.

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