Patent ID: 7029635

Claim:
A system for treating a treatable material containing a noxious component, which enables production of a harmless, reuseable residue from the treatment, comprising: a mixer for mixing a treatment agent with the treatable material to form a mixture, said treatment agent containing alkali material comprising at least one compound selected from the group consisting of an alkali metal compound and an alkaline-earth metal compound, at least one first heat treating furnace for producing a low oxygen concentration atmosphere, said first furnace including a first cylinder body having first and second end sections, said first and second end sections being formed respectively with a supply inlet and a discharge outlet, a first mixing and conveying device for mixing and conveying the treatable material supplied through the supply inlet toward the discharge outlet, a first heating device located outside said cylinder body to heat said cylinder body at a first temperature at which the treatable material is decomposed to generate a substance containing the noxious component, the substance contacting and reacting with the treatment agent to form a chloride, the first cylinder body having an axis which extends generally horizontally; means for supplying the mixture of the treatment agent and the treatable material into the supply inlet of the rotatable cylindrical body of the first furnace, at least one second heat treating furnace located separate from said first heat treating furnace and including a second cylinder body having first and second end sections, said first and second end sections being formed respectively with a supply inlet and a discharge outlet, a second mixing and conveying device for mixing and conveying the treatable material supplied through the supply inlet toward the discharge outlet, and means including a second heating device located outside said cylinder body for heating said cylinder body to heat the treatable material residue at a second temperature at which carbonization of the treatable material residue takes place, thereby accomplishing dry distillation of the treatable material so as to reduce volume of the treatable material, the second temperature being higher than the first temperature, the second cylinder body having an axis which extends generally horizontally; and a duct for connecting the discharge outlet of the first cylinder body and the supply inlet of the second cylinder body.