Abstract: In a first embodiment of the method and apparatus, the oxidant is loaded upon a support bed and is continuously regenerated by an ozone generator located upstream from the support bed. The ozone generator has a capacity less than the peak load requirement for the oxidant but fully regenerates the oxidant during low load periods. An ozone detector is located downstream from the support bed and includes a control circuit for selectively deactivating the ozone generator when the ozone downstream from the support bed exceeds a predetermined level. The support bed is composed of inert or adsorbing granular material. In a second embodiment, an aqueous solution containing a water soluble oxidant is applied to the support bed and is rinsed out following a purification cycle. The rinsed oxidant is replaced by fresh oxidant from a reservoir and the rinsed, spent oxidant is regenerated in an electrolytic or chemical regenerator and returned to the oxidant reservoir.

Abstract: A method and apparatus for stripping entrained organic vapor and solid particulate matter from a pyrolytic off-gas stream is disclosed. The off-gas is introduced at the top of a conical chamber having a variable speed "squirrel cage" rotor at its top. The wet, dirty, off-gas is drawn into the rotor from below and impinged upon the chamber walls which causes part of the organic vapor to condense and flow to the chamber bottom, thereby cleaning the chamber walls. A portion of the impinged gas is recirculated through the rotor while the remainder exits at the chamber bottom. The ratio of recycled gas to through gas is controlled by the speed of the rotor. Heating and cooling coils on the chamber walls are operable to control the rate of condensation.

Abstract: Sulfur dioxide is removed from stack gases by absorption in an aqueous medium, the preferred embodiment containing a chemical oxidant which generates hydrogen peroxide on a demand that equals the rate sulfur dioxide is absorbed into the medium whereby the absorbed sulfur dioxide is converted to sulfate form. The converted sulfur dioxide is removed in the form of an alkaline earth metal sulfate precipitate and spent oxidant is regenerated for reuse. In the other illustrated embodiments, the aqueous medium is maintained acidic from the start-up of the system. Barium peroxide is the preferred oxidant and acts both as oxidant and precipitant. Alternately, the oxidant and precipitant may be separate compounds.

Abstract: Sulfur dioxide is removed from stack gases by absorption in an aqueous medium, the preferred embodiment containing a chemical oxidant which generates hydrogen peroxide on a demand that equals the rate sulfur dioxide is absorbed into the medium whereby the absorbed sulfur dioxide is converted to sulfate form. The converted sulfur dioxide is removed in the form of an alkaline earth metal sulfate precipitate and spent oxidant is regenerated for reuse. In the other illustrated embodiments, the aqueous medium is maintained acidic from the start-up of the system. Barium peroxide is the preferred oxidant and acts both as oxidant and precipitant. Alternately, the oxidant and precipitant may be separate compounds.