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r r 'z-r�- $x `rte: .. a.:,.'its, ..,: �- '.`#'__.__�• _ ;� Via.."-P� .�, zF':� -• .. ®. <br /> €sYX.x:' r} Yr.._ _ ..r,w 'r s' S m' r.1 "' '.a-Y� ,-d.�:. i O x x"'�... s,�r �� ^�'a--. 4'�r'-..s 7 �»b...cs �+�f,,...m;vF :r.'ae sN µ <br /> s "'a" ,tea""".' 3=.`��,'n <br /> "' '-- _r <br /> mom. <br /> Y, <br /> E:i`E'E:CT1VE: CONTROL Or Alit <br /> petlr.ti� C, Elas.elt7an►a V.A.M. E.tuck <br /> InC. Klnr1 ]luck. 6 As <br /> San t�irrlo, California 5 ' foe, Inc..err Diego, iralifornia <br /> f 11001)VA TION <br /> Control of hydrocarbon rmi;,sionn from %oil venting systems <br /> is baing required in an increb5ing number of air basins (1eof <br /> Il. 1t is required not only .is n oxidant central atrategy <br /> but a15e5 for odor nuisance control. The equipment that is <br /> bring a('islled for this Control is an nktension of the tech- <br /> aolesgy origina!]y developed for control of gasoline vapors <br /> that are emitted during Markt:ting operations. <br /> The control strategy that ha;, been d0vt1ope:d requires offi- <br /> Ciont on-sito destruction of the hydrocarbon vapors in thcr <br /> extracted 41r. Removal of tho hydrocarbons by activated <br /> charcoal adsorption in only A temporizing option: the prob. <br /> lam 13 transferred elsewhere for off-site destruction of the <br /> enissionss. It is also. often a far more costly solution thin <br /> on-site oxidation to carbon dioxide and mater. <br /> Ilydroear.bons In the extracted air can be oxidized offic. <br /> iently in properly designed burners if the Concentration of <br /> Combustibles is above the lower flammability limit (L,r.L.l <br /> of the mixture. At COncentratxuns of hydrocarbons below the <br /> L•E'.I,., e•nrichese►nt fuel may he added to maintain efficient <br /> combustion, At even lower I*vels, Oxidation over catalysts <br /> can be used for efficient hydrocarbon destruction. There are <br /> two-boundary limits to tho catalytic process: (Il if the <br /> hydrocarbon rc+ncentratior is too high, the heat released <br /> during oxidation will cause high temperature destruction of <br /> the catalytic oxidizer, or (7) If the hydrocarbon concentra. <br /> tion In too lou, not enough hest is re=leased to maintain the <br /> Catalyst at a temperature needed for efficient oxidation. <br /> This paper dezcribea equipment, called the HuItiMode <br /> C°"'� h.ust"r (MMC). that is designed to give high dd`strelction <br /> effteiar:CIe s wLth any Concentration of _hydroCarboo-vapor Ire- <br /> -- - ---tae-extract c#-has.---fixe,--or -operatlnrl capacity, is not --- --- <br /> -- - - - -- - <br /> 1101te:d although. in practice there are two .typical a <br /> tierce. The first As forthe Cleanup of p s no <br /> a gawoline leak that <br /> has occurredaC a service station. These? conditions are <br /> generally chareactelrlted by Smaller diameter plumes of Baso- <br /> line in the soil (leas than too fact In diameter), by Iiex- <br /> itQ spaCe for e:lcanup equipment and by the owners' desirt <br />