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aerobic biodegradation,native sods <br /> g anaerobic biodegradation, native sods <br /> Sparged with oxygen pnor to seahng nitrogen spurge of mocnxosm(30 min)prior to sealing depletes WgtWn <br /> Mutes aff samples showed ae}abm deg+adat]on of both MTBE and TSAI Raoai rang election acceptors fpnmcinfy sulfate)sell avahhhl]b <br /> In 4 of 9 samples TBA initially increased as MTBE decreased with TBA AN sites showed anaerobic dogradatwn of both MTBE and TBA <br /> tailing afterward <br /> degradation rndimfed on 7 of 4 mrcromsrns for MTBE and a def(ar/nf <br /> Coa pared to other similar soi I microcosms showing positive results 7 of 9 for TBA <br /> Lag hmes are relalavely short in these microcosms <br /> Measured W-order rales am in a similar range <br /> q vs...w tr web. ,.rlr <br /> d.�im��^ IrP IrP x a�d119.•Imbn edv➢ 11s f-~�� <br /> [�13b!edam f <br /> S11¢ nf�ad cad d yv aDll eon Wl./RA,�s ,® aa9 ABYb IOeli ]IbW t}b�E 'w <br /> 9a110anVn.,PSM.r b ]tl] IOe% ➢bY 64,➢} !y• 1ex➢�' IN ]d] IWIi ]bl9 166b 1301 s <br /> ,ElNaieWnd 9 5tl5 IW% Obi 1Nm13Eh $ 91n IYI Id] Iii Yb� r5] <br /> Atpl 151 SAS �➢m last }n W ➢➢ImEeh <br /> ]06111.1°.4v.WF-y W ]Asa <br /> }ba 6}m]➢} n 6 hkay �� oda ,nix ➢nY ].Sb,t]9 ° m <br /> d] �14b}➢x Hbl.h ih➢b� <br /> 1i 1SM <br /> s i SAS ➢nY 15m1➢1 ® ,pQ% 1Lb}tl ,II}m tai. <br /> ad9 I➢eK l.b]6 tibri _ <br /> SV/el.�d fsyiei n re./QMF.w Seifei <br /> aerobic bfodegradahon, methanol added controls <br /> Methanol(MeOFI)addition intended to deplete any electron acceptors indicate microcosm test vmabrhy and via6diy(+1 OX–15%1 <br /> Mrdiendded➢imi/d 9 senlples,MMlrorwd➢rded n.asci/d 9dr➢ph,nd A change greater thm this level is interpreted as significant in aehve tests <br /> All sates showed degradation of MTBE in methanogomc conditions There is no apparent a6iohc generatoon of TBA from MTBE on controls <br /> Degradation in 8 of 9 microcosms <br /> TBA degradation indicated in only 1 of 9 microcosmsKM <br /> a.�im ayb as <br /> o.,Mrs.l�na .an].a <br /> „w.nl,irc6ic nU1dopir „-_ilieye,wr¢rwlbN•L,+a ,tl Pel lolr\i+e.bi <br /> PU <br /> �awcogp p}Atun�I !Stitt ➢411 IAiblliam�p ml <br /> Ibbwc.rlw.pyl� ]➢ 11 411 1IVelM sbbl <br /> I.al W I.n. <br /> ..O..On mYgsA sT WMI <br /> cometabolFsm <br /> amiY�hAws ] ] b,➢Of SI b Ht <br /> inconclusive as MTBE attic TBA degradaton was seen in both the absence <br /> za,b zd] ,re+ and presence of propane substrate <br /> .npeswnw _ _ <br /> ]d] <br /> ` SYS Geb➢1/el➢ew• ti°ar GWd fobYi I\ <br /> Summary/lnterpMMt on of Orange County TSA Study(1) Summary/Inierp mfatmn of Orange County TBA Study(2) <br /> pasrhve notc MTBE a TBA litodeVadation found at each sae in s!u I <br /> TBA at these s+tfs is predormriantly' 6f both aerobic&anmrabicc coa iti ons,MTBE m methanogerfre concliftons <br /> an miermeckla ba logiml degroda4en product from MTBE under •What does this mems For r nied'imwe aphons? <br /> lowoxygen/anaerobic condmans kyprool of plume rare,near <br /> sorxeesl gb. ae more sgrirfmm With Ise apfficani,vitt,. <br /> more srgnd'iormt ander Increasingly recited condfians tow MIRE&TRA W-&W tGOM MT/E 5 TSA mecaniotims <br /> Sane TBA Adapted b—prearnt I%6-ssepegs waloa– <br /> nwy be due b clssdidmn frau gosoTne product but o6wved hswels rdordru a t're'e b dose nswpsor <br /> am not holy explaned wo this rear h rti m done fepaaoBy <br /> amudetmg low/W wdues for MTBE and BTEX m same sanpW Mmtrun acceptor avoollo i4'(o gen,sulpIhMe),of In—ig. <br /> couild be Abiotic generation of TBA is un0k*tial ab>� -Site r"toodd vwh�h,w tit dip n <br /> ptnent <br /> saes ovw lima <br /> TBA generation as an amlytrcd a Moes is mogmrrcan at diose srtiet. Biomass gaawrth <br /> Dtssokrhon So—depktian <br /> shbe 61.6.h s➢wa.. w➢� srl.s sr.ra s.e+➢.. <br />