Automatic cleaning system for soil electrokinetic remediation electrode and use method of automatic cleaning system

Abstract

The invention discloses a soil electrokinetic remediation electrode automatic cleaning system and a using method thereof.The system comprises an outer shield, an inner separation net cover, a cleaning module and an electrode body, the inner separation net cover is arranged in the outer shield, the electrode body is vertically inserted into the inner separation net cover, and the cleaning module is arranged in the inner separation net cover and used for cleaning the electrode body. The electrode system adopts a layered structure, the outer protective cover can bear the pressure of a soil body and prevent large particles of the soil from entering an electrode solution, and the gap between the outer protective cover and the inner separation net cover is filled with gel for adsorbing a buffer medium, so that the effects of adsorbing pollutants such as heavy metal ions and the like and balancing the pH value of the electrode solution can be achieved, and the influence of alkalization / acidification of the electrode solution on the soil is reduced; the electrode bar adopts a bar-shaped inert electrode and is matched with the cleaning module, so that the phenomenon of current reduction caused by electrode activation polarization, resistance polarization and concentration polarization can be remarkably improved, the effects of reducing energy consumption and improving the remediation efficiency can be further achieved, and the electrode bar is particularly suitable for electrokinetic remediation of contaminated soil.

Description

technical field [0001] The invention belongs to the technical field of soil remediation, and in particular relates to an automatic cleaning system for electric soil remediation electrodes and a method for using the same. Background technique [0002] Electrodynamic remediation technology can treat soil and sediment of heavy metals, organic pollutants and composite pollutants, and has broad application prospects. Electrodes are essential equipment for electrodynamic remediation of polluted soil. The current will show a very obvious drop, which will reduce the repair efficiency and increase the energy consumption, which brings great constraints to the field application of electric power repair. [0003] Studies have shown that the main factor causing the current reduction is the polarization of the electrode: First, the hydrogen and oxygen bubbles generated by the hydrolysis reaction on the electrode cover the surface of the electrode. The bubbles are good insulators, which wi...

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Problems solved by technology

In addition, electrolysis of water leads to acidification of the soil near the anode area, and soil acidification usually reduces the zeta potential, which further leads to reverse electroosmosis, thereby reducing the repair efficiency; electrolysis of water makes the soil near the cathode area alkaline, heavy metal ions and hydrogen and oxygen produced by the cathode The heavy metal hydroxides produced by root ion compounding block the pores of the soil, thereby hindering the flow of substances and reducing the restoration efficiency

[0004] At present, for the problem of electrode polarization, there are methods such as developing new materials and increasing the electrode area, but the problems of increased resistance, increased energy consumption, and reduced repair efficiency caused by electrode polarization have not been effectively solved.

For the problem of soil acidity and alkalization, there are methods of using microfiltration membranes and ion-selective membranes, but they all have problems such as short life and easy clogging, and cannot effectively reduce soil acidity and alkalization caused by electrolysis, and the problem of reduced repair efficiency

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