寒冷地区活性污泥培养与驯化的实践4a87cabec77da26925c5b047

:1004-9762(2003)04-0367-03X1,2,1(11,014030;21,014030):;;;:X703:B:,,1PracticetoadaptationonactivatedsludgeincoldareaQIAOYun2hong1,ZHAOXin2mei2,GUZhao2quan1(1.BaotouWastewaterIndustryCo.Ltd,Baotou014030,China;2.BaotouWaterSupplyingCompany,Baotou014030,China)Keywords:coldarea;municipalwastewater;activationsludge;adaptationAbstract:ActivatedsludgeadaptationisintroducedinaccordancewiththeNorthSuburbsWastewaterTreatmentPlantinBaotouandsomecon2trollingparametersarecomeupwith.,,1,[1]1,,1,112001615,726,1#,2#3#,,111(mg/L)Table1AnalysisofwaterqualityBOD5COD(Cr)SSDOpH270437353016014037161,BOD5/COD(Cr)01618,,pH[2].,1.:(1),.(2).(3)MLSS1000mg/L.(4)SV302%.(5)..2211,5m,200312224JournalofBaotouUniversityofIronandSteelTechnologyDecember,2003Vol.22,No.4X:2003-08-21:(1971-),,,1COD,.2001727,2m,.,,.,.SV303%,.,,,.68d.212,,,DO1.04.0mg/L,1.10d,SV3020%,,,,,,,12132001815,,,,DO2103.0mg/L1,,5d,,SV3020%22%,SVI90120,MLSS2200mg/L11,COD65,SS30,1,,13(1)1,[3]1,:11BODCOD1(MLSS)1,1(SV30)(SVI)1,11,,,,115[2]1,1,691(2),t=2326,pH=710810,5d,SV3020%,MLSS2000mg/L,CODBOD90%,2d1(3),,,,1(4)1,2001811813,,1,,SVI=140180,DO1.5mg/L1,,,1,:,DO210mg/L1,1,,,11d,,,COD85%,SS90%,14(1)1a,,COD90%,BOD92%,SS90%,1(2),1791:DO=23mg/L,SV30=20%22%,SVI=90120,MLSS=2000mg/L125d,,1(3),,,,(375)863200312224Weusethisenergysystematicstogetherwiththedecaypropertiesofthelow2lyinglevesls,toinvestigatethe98Srphase2transitionalbehavior.FromTable1,onesurprisingpointisthattheagreementisquitegood.Inparticularly,theratio,E1,4/E1,2iswellreproduced,andclearlyliesbetweenthoseforagoodvibratororU(5)structureandarotororSU(3)nucleus.SimilarresultisfoundforE1,6/E1,2etc.Itispuzzledthattheunusealproperties[8]havebeenfoundin98Sr,forexample,thelowenergy(144keV)ofthe2+1withrespecttooneofotherSrisotopes.Thesepecu2liartiesaresurelyworthfurtherinvestigation.Here,weconsider98Srisatthecriticalpointundergoingsphericaltoaxiallydeformedshape.TheproblemofwhichistheidealX(5)nucleuscannotbesolvedverysimply.Itisevidentthat,althoughsomekeystructrualsignaturesthatcanprovideverysensi2tivetestsofnuclearshapetransitionareintroducedasdis2cussinginRef.[4,5],itisindeednecessarytoconsiderthepossibleperturbations(coreexcitation,forinstance).Inad2ditionitisdifficulttocomparethemaincharactersofnu2cleusthatisnotwellknownexperimentally,particularlyelectromagnetictransitionrates.Onehastonote,however,thecomparisionbetweenexperimentaldataandanX(5)fitinFig.2andTable1.Itisimmediatelyapparentthatthe98SrnucleusappearstobeamongthebestX(5)candidates.Meanwhile,onemayhaveexpectedsimilarphasetransitioninotherspecificnuclei,forexample,the98Zretc.4SummaryInthispaperwehavecomparedthespectra,E2transitionratesandbranchingratiosofSrisotopes,espe2cially98Srnucleus,withtheX(5)symmetry.Asshownintheintroduction,theSrneutron2richisotopesundergotheshapetransitionregionfromtheU(5)toSU(3).Here,wehaveshownthat98SrisclosetoexemplifyingX(5)symmetryand,infact,haveabletolocalize98Sratorto2wardtheSU(3)criticalpoint.Certainly,thisisagrassresultduetothelackofdata.Wearepayingagooddealofattentiontotheproblemnow.References:[1]IachelloF,ArimaA.Theinteractingbosonmodel[M].Cam2bridge:CambridgeUniversityPress,1987.[2]IachelloF.Dynamicsymmetriesatthecriticalpoint[J].PhysRevLett,2000,85:358023583.[3]CastenRF,ZamfirNV.EvidenceforapossibleE(5)sym2metryin134Ba[J].PhysRevLett,2000,85:358423587.[4]IachelloF.Analyticdescriptionofcriticalpointnucleiinaspherical2axiallydeformedshapephasetransition[J].PhysRevLett,2001,87:05250221205250224.[5]CastenRF,ZamfirNV.Empricalrealizationofacriticalpointdescriptioninatomicmucle[J].PhysRevLett,2001,87:05250321205250324.[6]ZHANGJinfu,LONGGuilu,SUNYang,etal.Descriptionof114CdintheE(5)symmetry[J].ChinPhysLett,2003,20(8):123121233.[7]ZhangDL,ZhaoHY.EmpiricalexampleofnucleuswithtransitionaldynamicalsymmetryX(5)[J].ChinaPhsyLett,2002,19(6):7792781.[8]LongGL,ZhuSJ,TianL,etal.Bandstructurein98Sr[J].PhysLettB,1995,345:3512354.(368),,1:[1],1[M]1:,19991[2]1()[M]1:,20001[3],,,1SBR[J]1,2001,27(5):302321573YANGZhong,etal.:Descriptionof98SrnucleusintheX(5)dynamicalsymmetry