A kind of groundwater halogenated hydrocarbon solvent removal method and device

Abstract

The application belongs to the field of groundwater restoration, and relates to a method and device for removing halogenated hydrocarbon solvents from groundwater. The method includes: first-stage preliminary separation of groundwater containing halogenated hydrocarbon solvent and fine solid particles by using a cyclone; the obtained enriched phase of halogenated hydrocarbon solvent enters a fluidized bed separator, and the particles in the fluidized bed separator are used to self-separate. The organized porous medium retains fine solid particles in the halohydrocarbon solvent-enriched phase and dispersed droplets in the polyhalogenated hydrocarbon solvent-enriched phase to obtain the halogenated hydrocarbon solvent phase and the deeply purified water phase; After the solid particles are saturated, the medium is swirled and oscillated to regenerate, and the particles self-organize the porous medium; the above operations are repeated to continuously separate the groundwater containing the halogenated hydrocarbon solvent and the fine solid particles. It realizes efficient removal of halogenated hydrocarbon solvents in groundwater, and at the same time removes fine solid particles in water. It has a wide range of applications, simple equipment, clean and efficient, low investment and no secondary pollution.

Description

technical field [0001] The application belongs to the field of groundwater restoration, and relates to a method and device for removing halogenated hydrocarbon solvents from groundwater. Background technique [0002] Halogenated hydrocarbon solvent is a good grease cleaning agent, widely used in machinery manufacturing, electronic component cleaning and other industries, and it is easy to enter the underground environment through container leakage and waste liquid discharge. The survey results of groundwater in 69 cities in 31 provinces and municipalities across the country showed that halogenated hydrocarbons were detected in 60% of diving and 52% of confined water. The most important pollutants in halogenated hydrocarbons are trichloroethylene (TCE), chlorobenzene, and 1,2-dichloroethane. Other common halogenated hydrocarbon solvent pollutants are: 1,1-dichloroethane, 1,1-dichloroethylene, tetrachloroethylene (PCE), carbon tetrachloride, etc. Most halogenated hydrocarbons...

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Problems solved by technology

This method is aimed at washing water with an oil content of 0.05-5g / L, and is suitable for treating water with a small amount of oil, but it is difficult to treat water with high oil content, and has poor adaptability to water quality fluctuations

[0012] Chinese Invention Patent Application Publication No. CN 108499159 A discloses a separation device and an oil-water separation method. The method uses a high-voltage electric field coalescence method to separate oil and water, which consumes a lot of energy

[0013] Therefore, in view of the easy diffusion of halogenated hydrocarbon solvents in groundwater, the problems of large investment, high energy consumption, and easy secondary pollution in the removal process, there is an urgent need in this field to develop a method that can cleanly and efficiently remove halogenated hydrocarbon solvents from groundwater. method and device

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