Institut Francais Du Pe'trole

Robert Gaulard

Gerard Martin

Process for treating industrial and/or urban waste comprising notably a drying stage, a waste thermolysis stage and a dechlorination stage by washing the solids resulting from the thermolysis. According to the invention, said thermolysis is achieved by direct contact of the waste with warm gases having a low oxygen content. The invention further relates to the plant for implementing the process.

Process and device for treating waste by direct contact

A process for treating industrial and/or urban waste includes the steps of drying the waste; effecting thermolysis of the dried waste by direct contact with warm gases, and washing solids resulting from the thermolysis with water to effect dechlorination thereof. Thermolysis is effected by direct contact of the waste with warm gases having a low oxygen content and water for washing the solids is obtained from condensation of vapors generated during drying of the waste A plant for treating industrial and/or urban waste includes a drier for drying the waste, a reactor for thermolyzing the waste, washing the solids from the reactor with water, such as from a condenser, to dechlorinate the solids, and a gas generator to generate warm gases, of which a part of the warm gases are used to heat the drier.

A plant for treating industrial and/or urban waste includes a stage for drying of the waste, followed by a stage for effecting thermolysis of the dried waste and a stage for effecting recovery of the solids and gases resulting from the thermolysis. Thermolysis of the waste is effected in a reactor by indirect heat exchange with combustion gases and drying gases for drying of the waste are subsequently treated to remove vapor materials and then recycled to a gas generator for generating the drying gases. Additionally the plant includes a stage for effecting dechlorination of the solids resulting from the thermolysis by washing the solids with an aqueous liquid, as well as a stage of separating the wash solids and the resulting wash liquid.

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Robert Gaulard