Physical repair separation process

1. Definition: Pollutants are removed and separated from the environment by using the differences in physical properties between pollutants and other elements in the environment.

A Advantages: Physical repair is efficient, fast and active, with short repair time and simple operation.

Convenient, little interference to the surrounding environment, and not very sensitive to the nature and concentration of pollutants.

Sense and other characteristics.

2.

B. Disadvantages: the repair effect is not ideal. Physical repair? It may cause secondary pollution.

The cost is high and it consumes a lot of manpower and material resources.

3. Classification A. In-situ physical remediation: according to the position of the treated object, the pollutants are disposed in situ to separate them from the environment.

B. Ectopic physical remediation: polluted environmental elements or the whole?

The body is transported to a specific place for treatment, removal or separation.

The pollutants in it

A. Basic physical separation and repair

Repair technology: B. Steam leaching repair

C. Fixed/stable prosthesis

D. electrodynamic repair and thermodynamic repair

Physical repair 1) dry screen: handling dry objects, large-scale 2) wet screen: when a large number of heavy metals are washed by particles.

1. Definition: the technology of reducing the vapor pressure of air gap in polluted environment and taking out pollutants in the environment after converting them into vapor form. 2. Principle: Using the concentration gradient of volatile pollutants between solid, liquid and gas medium, the pollutants are converted into gas and discharged into the environment under the condition of pressure difference. The basis is the volatility of pollutants, and the pressure difference between polluted environment and atmosphere can be formed through negative pressure guidance or positive pressure. Objective: To understand the volatile pollutants in polluted environment. A. In-situ steam leaching method: by arranging extraction wells in polluted environment, air flow is introduced into the environment, and volatile and semi-volatile organic compounds are discharged after entering vacuum wells with air. The technology also includes a tail gas treatment system 4. Type.

B. Eccentric extraction: In the accumulative polluted environment, introduce air flow into the pipe network arranged in the oil wiping seam, so that volatile and semi-volatile pollutants can be discharged with the air flow. The technology also includes a tail gas treatment system C. Soil Vapor Extraction (SVE): a vacuum pump is used to drive air to flow through the pores of polluted soil, desorb and entrain organic components to the extraction well, and finally tail gas treatment is carried out on the ground. In order to increase the pressure gradient and air velocity, air injection wells are also installed in the soil. D. In-situ air injection: remediation of organic pollution of groundwater. In operation, air is injected into groundwater, and when the air rises, it will volatilize and desorb the organic pollutants in groundwater and water-saturated soil, and then the air flow will bring the organic pollutants to unsaturated soil, where the organic pollutants will be recovered by the conventional SVE system. 5. Scope of application: It is mainly used to repair the environment polluted by volatile organic chlorides.

It can also be used to remove pollutants such as oils, heavy metals and their organics, polycyclic aromatic hydrocarbons in the environment.

6. Advantages: In-situ operation, simplicity, high cost performance and little environmental interference.