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1、JournalofHydrology,44(1979)241--266241©ElsevierScientificPublishingCompany,Amsterdam--PrintedinTheNetherlands[2]GROUNDWATERQUALITYNEARANUNDERGROUNDCOALGASIFICATIONEXPERIMENTJ.H.CAMPBELL',F.T.WANG',S.W.MEADandJ.F.BUSBY'LawrenceLivermoreLaboratory,Livermore,CA945
2、50(U.S.A.)(ReceivedApril25,1979;acceptedforpublicationMay29,1979)ABSTRACTCampbell,J.H.,Wang,F.T.,Mead,S.W.andBusby,J.F.,1979.Groundwaterqualitynearanundergroundcoalgasificationexperiment.J.Hydrol.,44:241--266.Groundwatersamplingandanalysishavebeencarriedoutatth
3、esiteofanundergroundcoalgasificationexperimentconductednearGillette,Wyoming.Waterfrommorethan12wellsinthevicinityoftheexperimenthasbeensampledbefore,during,andupto25monthsfollowinggasification.Watersampleswereanalyzedforavarietyofcharacteristics,includingthepre
4、senceof70inorganicspecies,phenolicmaterialsandvolatileandsemi-volatileorganics.Wefindagreatlyincreasedconcentrationoforganicmaterials,particularlyphenols,justoutsidetheburnboundaryandavarietyofinorganicspeciesissuingfromwithintheresidualashbed.Alldetectablecont
5、aminantsrapidlydecreasedinconcentrationwithdistance,althoughabove-backgroundlevelsofsomematerialsweredetected30m(100ft.)fromtheburnzonewithinthreedaysofthegasification.Severalimportantcontaminantsshowedalargedecreaseinconcentrationwithtimedue,probably,toadsorpt
6、ion.Ourresultssuggestasimplephysicalpictureofthedevelopmentofgroundwaterpollutionnearanunder-groundcoalgasifier.INTRODUCTIONUndergroundcoalgasificationoffersimportantenvironmentaladvantagesincomparisonwithmoreconventionalmethodsofcoalrecovery.However,therearece
7、rtainenvironmentalconcernsthatrequirecarefulevaluation.Thepossibili-tythatundergroundreactionproductsmaycauseadversechangesinground-waterqualityisparticularlyimportant.TheLawrenceLivermoreLaboratory(LLL)ispursuingathree-partprogramtoclarifythenatureandsignifica
8、nceofthegroundwaterquestion.Theprogramactivitiesincludealaboratoryinvestiga-tionofgasificationreactionproductsandtheirinteractionwithcoal,amodelingstudyoftheevolvingplumeofc
