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1、AdvancesinEnvironmentalResearch7(2003)687–694Centrateviscosityforcontinuousmonitoringofpolymerfeedindewateringapplicationsa,bcMohammadM.Abu-Orf*,ChristopherA.Walker,StevenK.DentelaBiosolidsR&DDirector,VivendiWaterNorthAmericanTechnologyCenter,1901WestGardenRoad,Vineland,NJ08360,USAbDepartme
2、ntofCivilandEnvironmentalEngineering,UniversityofDelaware,Newark,DE19716,USAcDepartmentofCivilandEnvironmentalEngineering,UniversityofDelaware,Newark,DE19716,USAAbstractTheresearchershavepreviouslydocumentedthatminimumcentrateorfiltrateviscosityusingbatchmeasurementindicatestheoptimumpolyme
3、rdoseasdeterminedbycapillarysuctiontime(CST)andsolidsrecovery.Thispaperdescribesresearchconductedtotesttheuseofcontinuouscentrateviscositymeasurementsforpolymerdosemonitoringinthebiosolidsdewateringprocess.Initialresultsindicatethatliquidstreamviscositymustbemeasuredon-sitesincefiltratesamp
4、lesintheoverdosingrangedecreaseinviscosityoverseveralhoursfollowingsampling.Asensitiveviscometerisrequiredforcontinuousmonitoringsincetheobservedviscosityrangeisfrom1to3centipoise(cP).Aninternationalsearchforviscometervendorsshowedthattwotypesofviscometerscouldbeusedforthispurpose:rotationa
5、landvibrational.Onlydatafromrotationaltypeviscometerswereobtainedforthispaper.Theviscometerwasinstalledtocontinuouslysamplecentratefromthecentrifugationofanaerobicdigestedbiosolids.Full-scaledoseresponseexperimentsshowedthatminimumviscositycorrelateswithmaximumcakesolidsmeasurements,andthus
6、suchviscometerscanbeusedinmonitoringandcontrollingpolymerfeedduringdewatering.However,severalmodificationsarerequiredforsuchviscometerstowithstandthedemandingconditionsinwastewatertreatmentplants.Useofviscosityforcontrolofpolymerdoserequiresuseofaminimumvalue,necessitatingacomplexcontrolalg
7、orithm.2002ElsevierScienceLtd.Allrightsreserved.Keywords:Viscosity;Centrate;Polymer;Monitoring;Dewatering;Conditioning1.Introductionthisoptimumdoseisthusaconsiderablechallenge(e.g.Abu-OrfandDentel,1998).Optimizingpolymerdosageinthebiosolidscondi-Aprevio
