Thermal remediation process

Details Thermal remediation process Thermal remediation process

B - Operations, Transporting

09

C

B09C 1/06 (2006.01)

Patent

CA 2468720

A process and apparatus are provided for removing organic and inorganic contaminants from solid media such as drill cuttings, tank bottoms or contaminated soils. The process is conducted in at least one thermal screw conveyor (12, 22, 32) which provides two or more separate temperature zones which can be operated as one or more of low temperature thermal desorption, high temperature thermal desorption and pyrolysis. Preferably the process is conducted in three interconnected thermal screw conveyors (12, 22, 32) which each provide a separate temperature zone. The process is conducted such that the solid media in each of the temperature zones is held under a vacuum. Direct and indirect heating of the solid media in each of the temperature zones is provided. In the pyrolysis zone, an organic binder may be added to encapsulate inorganic contaminants such as metals.

L'invention concerne un procédé et un appareil destinés à éliminer des contaminants inorganiques et organiques d'un support solide, tel que des déblais de forage, fonds de cuve et sols contaminés. Le procédé est mené au moyen d'un convoyeur thermique à vis (12, 22, 32), au moins, comportant deux ou plusieurs zones thermiques séparées, fonctionnant dans un mode de désorption thermique à basse température, de désorption thermique à température élevée ou de pyrolyse, ou dans plusieurs de ces modes. Le procédé est mené, de préférence, au moyen de trois convoyeurs thermiques à vis interconnectés (12, 22, 32) comportant chacun une zone de température séparée, et de façon que le support solide, dans chacune des zones de température, soit maintenu sous vide. Dans chaque zone de température, le support solide est soumis à des chauffages direct et indirect. Dans la zone de pyrolyse, il est possible d'ajouter un liant organique afin d'encapsuler des contaminants inorganiques, notamment des métaux.

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