Process device for repairing PAHs polluted soil by electric Fenton method, and method of process device

Abstract

The invention discloses a process device for repairing PAHs polluted soil by an electric Fenton method, and a method of the process device. The process device comprises a plurality of cathodes (1) and anodes (2), which are parallel to each other and vertically placed, an external hydrogen peroxide H2O2 storage tank (3), a stabilized-voltage direct-current power source (4) and a housing (8), wherein the cathodes (1) are in parallel connection; the anodes (2) are in parallel connection; the cathodes (1) and the anodes (2) are connected with the stabilized-voltage direct-current power source (4) through wires (7); the cathodes (1) and the anodes (2) are activated carbon fiber electrodes which are vertically fixed in clamping slots; and a chemical feed pipe is connected between the activated carbon fiber electrode of each cathode (1) and the external hydrogen peroxide H2O2 storage tank (3). Through the adoption of the process device disclosed by the invention, an electrochemical technology and a Fenton-like oxidation technology can be organically combined; an iron element which is inherent in the soil is effectively utilized; effective degradation of PAHs in the soil under an acidic condition is realized; repair procedures are simple and practicable to operate, and repair process is simple and efficient; and no secondary pollution is generated.

Description

technical field [0001] The invention relates to an electrochemical treatment technology for polluted soil, in particular to a process device and method for repairing PAHs-contaminated soil by an electro-Fenton method, which utilizes electrochemical combined Fenton-like oxidation to degrade PAHs in soil. Background technique [0002] Polycyclic aromatic hydrocarbons (PAHs) are one of the earliest carcinogens discovered in nature. PAHs distributed freely in the atmosphere and water environment will eventually enter the soil through sedimentation, surface runoff, etc., making the soil the main storage of PAHs in environmental media. Reservoirs and transfer stations, PAHs remaining in the soil pass through the food chain and finally enter the human body, causing extremely serious harm to human health. With the continuous development and utilization of petrochemical products by humans, and the characteristics of PAHs toxicity, bioaccumulation, semi-volatility and long-term persis...

AI Technical Summary

Problems solved by technology

Among them: the physical remediation method often has the problems of high processing cost, heavy workload, incomplete repair, and easy damage to the soil structure to affect the ecological environment; phytoremediation and microbial remediation have the advantages of simple operation, low operating cost, and no secondary pollution. , but due to limited degradation ability, long repair period, and uncontrolled factors such as local environmental geological conditions and climate factors, there are great limitations in practical engineering applications; common chemical repair methods, such as chemical leaching , solvent extraction and other technologies have the advantages of high treatment efficiency and short repair period, but the treatment cost is high, which may cause secondary pollution to the environment

Images