Contaminated soil remediation is a technical measure based on physical, chemical, biological, and ecological principles, and artificial regulation, to reduce the concentration (activity) of soil pollutants, to achieve harmless and stable pollutants, and to achieve detoxification effects. .

The thermal desorption separation technology developed by our company in the soil remediation project can avoid the high energy consumption and secondary pollution caused by the rotary kiln incineration, and can also avoid the relatively large water consumption caused by the water washing method and the subsequent water treatment. The problem is that the treatment cost is relatively low, and it can repair the soil polluted by some heavy metal organic substances.

Compared with traditional incineration technology, thermal desorption technology has the following advantages:

1. Reduce a lot of consumption. Traditional incineration technology requires secondary combustion. The temperature of the secondary combustion chamber is required to reach about 1100°C to achieve high-temperature flue gas incineration. The temperature of the thermal desorption technology combustion chamber only needs to reach 550-600°C, and there is no secondary combustion.

2. The indirect heating method is used to avoid the new pollution sources generated after the pollutants are incinerated to pollute the environment again.

3. The organic matter in polluted soil can be used as a resource after corresponding water treatment.

Thermal desorption is one of the technologies for the remediation of contaminated soil, which can remediate the soil of the site polluted by organic matter (or volatile inorganic matter), and can achieve a good remediation effect. The implementation methods can be divided into two types: ex-situ and in-situ. Ex-situ thermal desorption heats the soil contaminated by organic matter to above the boiling point of the organic matter through direct or indirect heating, so that the pollutants can be volatilized into a gaseous state and then separated. The treated soil can be backfilled and continued to be used. Ex-situ thermal desorption technology selectively volatilizes pollutants by controlling system temperature and material residence time without damaging organic pollutants, and can effectively remove volatile organic compounds, such as benzene series and chlorinated solvents, volatile petroleum hydrocarbons, aromatic hydrocarbons, etc., and can also effectively remove low-volatility, high-boiling point, refractory organic pollutants such as PCBs, DDT, organochlorine pesticides, and dioxins. Boiling point organic pollutants can be heated once to achieve the remediation target value.