Desorption system

U.S. EPA, SITE Demonstration Bulletin, Thermal Desorption System Clean Berkshires, Inc., EPA/540/MR-94/507, Cincinnati, Ohio, 1994. 

Give examples of desorption systems following first-, second- and zero-order kinetics. Can you give a physical interpretation for the latter ... 

In the thermal desorption technique excavated soil is heated to around 200 to 1000°F (93 to 538°C). Volatile and some semivolatile contaminants are vaporized and carried off by air, combustion gas, or inert gas. Off-gas is typically processed to remove particulates. Volatiles in the off-gas may be burned in an afterburner, collected on activated carbon, or recovered in condensation equipment. Thermal desorption systems are physical separation processes that are not designed to provide high levels of organic destruction, although some systems will result in localized oxidation or pyrolysis. 

Examination of the effect of temperature (220°C-270°C) and the total heating time (20-45 minutes) on the thermal desorption process led us to adopt 2TO°C for 45 minutes as the optimum conditions for further studies. Assessment of the commercially available desorption systems in which there is flash heating of the sample, have shown that significant losses of some important compounds (p-ciesol, indole) occur on the surfaces of the metal connectors and sample transfer lines. It was to overcome these problems that the all silica system (Figure 2) was developed. 

T0500 MaxymUlian Technologies, Inc., Thermal Desorption System... 

T0502 McLaren/Hart, Inc., IRV-100, IRV-150, and IRV-200 Thermal Desorption Systems... 

T0502 McLaren/Hart, Inc., IRV-100, IRV-150, and IRV-200 Thermal Desorption Systems T0659 Resources Conservation Company, Basic Extractive Sludge Treatment (BEST) T0715 Smith Technology Corporation, Low-Temperature Thermal Aeration (ETTA)... 

T0498 Matrix Photocatalytic, Inc., TiOi Photocatalytic Treatment System T0500 Maxymillian Technologies, Inc., Thermal Desorption System T0522 Micro-Bac International, Inc., M-1000 Series Bioremediation Products... 

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