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Mg�= rm-mkou couvtot. or Anf FROM TIWATHrUr SAY5TEHS, V.A.m. ljock 11auctech Inc. Kino, PticV 4 Assoc. Inc. San Mego, California San Dicqo, California I NTROP11C710N Control of hydroc.,teban emlD::ion t; frLlm :;Oil venting sytitemT; is tiering required In an incre4sing number of air bazinn (ref 11. It 15 required not only An an oxidant control strategy but also for odor nuisance control. The equipment that is being applied for this control is an extension of the tech- nology originally developed for control of qa5oline, vapors that Are emitted during marketing operAtions. The control strategy thAt, hag been developed requires effi- cient on-site destrtiction of the hydrocarbon vapors in the extracted air. Removal of tht hydrocarbons by activated charcoal adsorption is only a temporizing option; the prob- Inm is transferred elsewhere for off-site destruction of the emission... It is 4130 often a far more costly solution than on-site oxidation to Carbon dioxide And vater. Hydrocarbons in the extracted air can be oxidized effic- iently in properly -designed burners if the concentration of combustibles is ibove the lower flammability limit JLX.L.) of the mixture. At concentrations of hydrocarbons below the L.F.L., enrichment fuel may be added to maintain efficient combustion. At even lower levels, oxidation over catalysts can be used for efficient hydrocartmn destruction. There are two boundary limits to the catalytic process: (1 ) if the hydrocarbon concentration is too h1qh, the heat released during oxidation will Cause hJ9b temperature destruction of the catalytic oxidizer, or (2) .if the hydrocarbon Concentra- tion Is too low, not enough heat is released to maintain the catalyst at a temperature► needed for efficient oxidation. This paper describes equipment, called the multimcip Combuster (HMC)o that Is designed to give high destruction efficiencies with any concentration of hydrocarbon vapors in the--extracted cjas.---S J zc,-o.--o por*st J nij--ca pac It V 5--nat--- limited. although In practice there are two typical applica- tions. The first is for the cleanup of a gasoline leak that has occurred at a service station. These conditions are generally characterized by smaller diameter plumes of Baso- line In the sol) tiess than 100 feet in diametar), by lim- Ited space for Cleanup equipoont. and by the owners' desire