BAF反冲洗过程的优化控制分析闫立龙

BAF123311．1500302．3000743．150090BAFBAFBAF。BAF3min5min10min918L/m2·sBAF。、。BAFX703C1000－4602201111－0080－0408－10《》Zd091204GB08C203AnalysisonOptimizationControlofBAFBackwashYANLi-long1WANGXing-jian2LIWei-guang3RENYuan3ZHANGYing11．SchoolofResourceandEnvironmentNortheastAgriculturalUniversityHarbin150030China2．NorthChinaMunicipalEngineeringDesignandResearchInstituteTianjin300074China3．SchoolofMunicipalandEnvironmentalEngineeringHarbinInstituteofTechnologyHarbin150090ChinaAbstractInordertooptimizethebackwashparametersofbiologicalaeratedfilterBAFfromthepointofdecreasingenergyconsumptionandusingmodelanalysisandmathematicderivationanop-timalperiodformulaofBAFbackwashwasbuiltandtheoptimalbackwashparametersweredetermined．Theeffectofbackwashparametersonmicroorganismswasinvestigated．Theresultsshowthattheoptimalbackwashperiodisthecorrespondingoperationtimeoffilterwheninstantaneouswaterproducingratee-qualstoperiodicaveragewaterproducingrateandthewaterproducingrateismaximumatthistime．Theoptimalparametersarecalculatedbytheformulaasfollowsairwashfor3minair-waterwashfor5minandwaterwashfor10minwithwaterintensityof9L/m2·sandairintensityof18L/m2·s．ThebackwashparametersinfluencemicroorganismsgreatlyandthelossrateofbiomassismaximumattheinletofBAF．Theoptimalbackwashperiodicformulacannotonlyimproveefficiencyoffilterandsaveenergyconsumptionbutalsobeusedtohelpachieveautomaticcontrolofbackwash．·08·271120116CHINAWATER＆WASTEWATERVol．27No．11Jun．2011KeywordsbiologicalaeratedfilterBAFbackwashoptimizationBAF、、BAF。BAFBAF1～4、、。BAFBAFBAF。11.11。BAF150mm、3700mm2250mm250mm。BAF、。50L/h3∶1。1Fig．1Schematicdiagramofexperimentsetup1.2COD7．97～45．3mg/L、0～1．53mg/L、94～800mg/L、pH7．20～8．52、23～27℃。1.3CODpHpHS－3CpH5。22.1。6。。Qt=∫t0qtdt－∫t'0q1tdt－∫tb0q2tdt－∫t″0qtdtt+tb+t'1QtL/hthqtL/hq1tL/ht'hq2tL/htbht″h。qt、q1tq2t×tb、t″qtt。Qtqtt+tb+t'+t″－∫t0qtdt－∫t'0q1tdt－∫tb0q2tdt－∫t″0qtdt=02qt=∫t0qtdt－∫t'0q1tdt－∫tb0q2tdt－∫t″0qtdtt+tb+t'3∫t'0q1tdt+∫tb0q2tdt+∫t″0qtdt=c1、tb+t'=c2Q't=qtt+c2－∫t0qtdt－c1t+c224Qt·18·．watergasheat．comBAF2711Q″t=q'tt+c22－2qtt+c2－2∫t0qtdt－c1t+c235QtQ't=0t0qt0=∫t00qtdt－c1t0+c26t056Q″t0=q't0t0+c27qtq't＜0t0+c2＞0Q″t0＜0QtQttftf=∫tf0qtdt－∫t'0q'tdt－∫tb0q″tdt－∫t″0qtdtqt－tb－t'813Qt=qtBAF。、。。2.2BAF、。8kPaSS。。。2．8m3/m2·h、350～400mg/L、COD20～35mg/L3min、5min、10minBAF6h。1。1BAFTab．1OperationresultsofBAFatdifferentbackwashconditions/L·m－2·s－1/L·m－2·s－1/L·m－2·s－1/%/L·h－1/d1291899．247．036201591895．4317．60401891890．6523．96502191844．5124．17711871896．549．1392．501891889．6523．965018111873．2615．576118131858．6016．62711、。。BAF9L/m2·s、21L/m2·s。9L/m2·s、18L/m2·s5d。2.3BAF、BAF。9L/m2·sBAF。BAF10cm15L/m2·s·28·2711．watergasheat．com49．07%21L/m2·s75．47%2。110210cm1521L/m2·s110cm36．58%73．72%210cm29．92%58．37%。、。2BAF10cmFig．2EffectofairvelocityonbiomassduringbackwashinginBAF10cmzone。。。。3①BAF。、。②40%。③3min、5min、10min918L/m2·s。1．J．200324586－91．2．J．200218214－17．3．J．2007237102－105．4HallDFitzpatrickCSB．Spectralanalysisofpressurevariationsduringcombinedairandwaterbackwashofrap-idgravityfiltersJ．WaterRes199933173666－3672．5UrferDHuckPM．MeasurementofbiomassactivityindrinkingwaterbiofiltersusingarespirometricmethodJ[e-mail]2010－11－10·38·．watergasheat．comBAF2711