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In situ Thermal Unit
The thermal desorption is a technology to treat soil pollution by wearing high temperature lands. Thermopile © treatment is an innovative implementation of thermal desorption invented by Deep Green. This technique is the subject of a patent for which Deep Green has worldwide exclusivity. As with conventional thermal desorption treatments, the contaminated soil is first heated to a temperature sufficient for the pollutants to evaporate (desorption phase), then these pollutants, once in the gaseous phase, are conveyed to a chamber of combustion where they are permanently destroyed. The technology applies to soil polluted with hydrocarbons (aliphatic, mono-aromatic or poly-aromatic), halogenated organic pollutants or certain inorganic pollutants such as cyanides.
In situ thermal desorption is an emerging technology that can treat soil and polluted sediments by heating them with heating tubes. The in situ thermal desorption process is mainly used when the venting reaches its limits (soils that are not very permeable or semi-volatile compounds that are difficult to extract) or when the conditions for carrying out the excavation are too complicated.
In addition, the technique can also treat floating layers (LNAPL) and is particularly effective where other skimming / pumping / extraction techniques have technical limits.
The soil in place is heated by different means (steam, hot air, electrodes, depending on the variants), which causes a rise in temperature having the effect of:
- to promote the desorption of contaminants strongly adsorbed on the soil matrix,
- to increase the vapor pressure of low volatility compounds in order to be able to volatilize them and extract them in the gas phase.
Depending on the volatile compounds to be recovered, the different applications of the treatment methods either allow them to be recycled directly into the heat generation circuit, or require a dedicated extraction network similar to that of venting.
T-Flex is an evolution of Thermopile © technologydeveloped with a view to significantly increasing the possibilities of adaptation to the specific conditions of each site.
As the increase in flexibility goes through the increase in modularity, the technological evolution of the process consists in decentralizing the combustion on each of the tubes placed in the ground. T- Flex was able to benefit from the Deep Green development center to gradually see the light of day. Particular attention has also been paid to gas extraction and to the modularity of the burners in order to guarantee the adequate treatment of the extracted vapors.
In this system, the combustion fan and the control and regulation cabinet are common for all burners. Each burner is individually checked and can be taken out of service if necessary.