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•,.a "3`_ _ � _ Vii+•i a .,�' "� :�+�#' ,°�w`—• � x �� .... _ �l raa.r�nrr r.:r,I,al i'a�r.:-.:.•Ir �� +:hal:l�0r�j' •t;, •-a: :.w:,i. e: ATTACHMENT 1C a'JcneY Cinpnriatty •iSZtt t;r'i."J';,; ' RcSearch anA Ocvdlopmcnt `-EpA:62.84=179 5�pir;199q',ti; �rEPA Project Sum Mat, .� Process Design Manual for Striprping of organics Harish M.Shukla and R.Edwin Hicks Procedures and correlations for de- given application is dependent on the signing andeosti.•,p stripping towers for characteristics of the organics as well as ' the ren.oval of orgonies from aqueous on other factors including cost and the streams are presented.The emphasis is need to recover the separated organics. on practical methods suitable for engi- in the case of a mixture of organics a neering estimates. The designs cover having different properties,two or more steam strippers with and without con- treatments in series may have to be densers and reflux, as weft as air provided. The use of two different pro- stripping.Steam stripping is treated as ceases, for example, one with cost de- an isothermal process.and simplified pendent on throughput, followed by.a equations for determining tower height polishing step havia.g cost dependent on may be used. Determination of the feed concentration•can result in a lower height adiabetie,rir strippers involves a overall treatment cost. in a wastewater tedious, iterative solution of heat and treatment train,stripping is typically the material balances.A BASIC computer first process that separates dissolved i+ program for carrying out these cal;ula- substances: It follows clarification or tions is provided, filtration steps that are used for removal Capital costsan:determined.essenti- of suspended Solids-and may precede ally, by estimating the quantity of polishing steps such as carbon or ruin materials required in conjunction with adsorption. material costs.Cost factors fora range The essential characteristic that deter- of materials and installation factors are mines the effectiveness of stripping in suggested. Methods for costing ancil- separating dissolved organics is the reta- �. Isryequipmentsuchasheatexchangers. dve,srolalility or vapor pressure of the PUMPS.compressors,and storage ves- organic above the aqueous phase.It has sels are included. it is recommended been shown that at leas:haft of rM tt36 f that vendor quotes be obtained what- =,mifAEtn rhm IiSFP4'etn� aver possible. Typical operating costs Es"are ufficienti v ! it ff iv.t for energy and maintenance are also fr,mavedtrorn a ueous wastey cams by given. ±tripping.SistveiahT of thc5e,{an hcr.r vy ThisPralectSumnrary was Yeveloped easilysiripoedbyairarambienttemprra- ia by EPA's Industrial Environmental Re- t"r_s- Others can be stripped by air at srsrch Laboratory, Cincinnati, ON, to ambient temperatures with steam. The announce trey findings of the reseereh remaining substances an the list have projeer that is fully d061rmrnrrd in arelatively low vapor pressures andamnot .. separate report of the same title fsee easily strippad. PraectReport ordering information it Strippingisemerging asacost-effective bachl- alternp'.ive for treating a wide range of aqueous streams containing organics.Ii may be used both as an in-plant process Introduction for the recovery of organics from relatively Stripping is one of several processes concentrated aqueous streams and as an used commercially for separating organ- end-oi-pipe •reatment for removal at icrdram water and wastewater. The dilute and even trace quantities oforgan. sefectior?of the optimum process lar any ics from wastewaters prior to dischat2a