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Abstract

A process for treating a waste gas containing condensable organic compounds in the form of an aerosol of liquid particles, in a regenerative thermal oxidation system comprising a combustion chamber and at least two regenerators. During a first period of time, the waste gas is directed through a first one of the regenerators wherein the waste gas is heated by contact with a packing material contained therein, then through the combustion chamber wherein oxidation of the organic compounds contained in the waste gas is achieved and finally through a second regenerator wherein the oxidized gas coming from the combustion chamber is cooled by contact with a packing material contained in the second regenerator, such a contact causing simultaneous heating of the packing material contained in the second regenerator. The oxidized gas which leaves the second regenerator is then purified and may be discharged to the atmosphere. During a second period of time, the waste gas is directed through the second regenerator, then through the combustion chamber and finally through the first regenerator prior to discharging it in a purified form to the atmosphere. This process is improved in that the temperature of the waste gas is increased prior to introducing it into the first regenerator during the first period of time or into the second regenerator during the second period of time by mixing it with a stream of purified gas obtained by the process. As a result, a complete evaporation of all the liquid particles contained in the waste gas is achieved.

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