Groundwater remediation method by Electro-Fenton reaction using iron cathode

Abstract

The invention relates to a groundwater remediation method by Electro-Fenton reaction using an iron cathode. Specifically, an inert conductive material is used as an anode; iron is used as a cathode A; a conductive material is used as a cathode B; hydrogen peroxide is in situ generated by hydrogen and oxygen, which are produced by electrolyzing the groundwater, under the action of a catalyst; highly strong oxide is generated with the existence of Fe(II) and in a weak acid condition with the pH being 3 to 3.5 to oxidize and decompose the organic pollutants in the groundwater, so as to achieve the in-situ remediation of the organically contaminated groundwater; and the Fe(II) is in situ generated by using the iron cathode A in the weak acid condition with the pH being 3 to 3.5, which is formed under the electrochemical action automatically. By the method, the Fe(II) at a certain concentration is in situ generated by using the iron as one cathode and in the weak acid condition, which is formed under the electrochemical action automatically; and the method is flexible and controllable in the processing effect and environment-friendly in the processing process.

Description

technical field [0001] The invention relates to an iron-cathode electric Fenton groundwater restoration method, which belongs to the technical field of groundwater restoration. Background technique [0002] Groundwater is widely used as a source of drinking water. However, groundwater in many cities is polluted to varying degrees. The pollution caused by toxic organic substances such as chlorinated hydrocarbons, benzene series, ethers, etc. is particularly serious. The overall pollution situation is very serious. In groundwater pollution, the contamination of groundwater by small-area sites characterized by source pollution has received high attention due to the high degree of pollution and serious hazards. Therefore, it is of great significance to remediate the groundwater of the polluted site caused by toxic organic substances. [0003] Electro-Fenton technology has attracted great attention in the field of water treatment due to its advantages of good treatment effect, f...

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Problems solved by technology

Unlike wastewater treatment, issues such as Fe(II) supply and pH adjustment difficulties exist during groundwater remediation

The supply of Fe(II) has the following problems: ①When the sacrificial anode method is used to produce Fe(II), the amount of Fe(II) and the final iron sludge production are large, and the corrosion loss of the iron anode is very serious; ②When When Fe(II) is added from an external source, due to the large amount of Fe(II) at the beginning, it cannot be fully utilized and regulated, and a part of Fe(II) will be oxidized to Fe(III) under the action of anode oxygen, and Fe(III) The ability to reduce to Fe(II) at the cathode is limited, and the effective concentration of Fe(II) cannot be maintained at a high level, so that the treatment effect gradually declines; ③Although there is a small amount of Fe(II) in the groundwater aquifer, the Fe(II) The content of (II) is usually very low (such as < 1 ppm), which is not enough to ensure the efficient progress of the electro-Fenton reaction

In terms of pH adjustment, no matter whether Fe(II) is produced by sacrificial anode or Fe(II) is added from an external source, it is necessary to add acid and alkali for artificial adjustment, which is difficult to achieve under the condition of groundwater occurrence.

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