徐竟成,刘伟,曹海花,龚成晨,魏巧玲(同济大学环境科学与工程学院长江水环境教育部重点实验室,上海200092)针对城市景观水体夏秋季节易发生藻华现象,且藻类密度小,常规方法难以去除的特点,采用高密度微气泡层的表面吸附及过滤截留作用,实现细小藻类的迅速捕集和分离去除。试验结果表明:当气液混合泵压强为0.42MPa时,系统产生的微气泡平均直径为72.0μm,数量密度达到2.1×108个/L;在水力负荷为5m/h、溶气水回流比为130%的优化运行条件下,对叶绿素a的平均去除率达到93.4%。作为上海世博会期间景观水体藻类暴发的应急处理技术之一,可为城市景观水体的水质控制提供应用借鉴和技术参考。城市景观水体;除藻;高密度微气泡过滤;快速分离X703A1000-4602201407-0014-04FastSeparationofAlgaefromUrbanLandscapeWaterbyHighDensityMicrobubbleFiltrationXUJing-chengLIUWeiCAOHai-huaGONGCheng-chenWEIQiao-lingKeyLaboratoryofYangtzeRiverWaterEnvironment<MinistryofEducation>CollegeofEnvironmentalScienceandEngineeringTongjiUniversityShanghai200092ChinaAbstractAlgaebloomsbreakoutduringsummerandautumnseasonsandlowdensityalgaearedifficulttoremovefromurbanlandscapewaterbytraditionalprocesses.Thehighdensitymicrobubblelay-erwasadoptedtoachievethefastcollectionandseparationofsmallalgaethroughsurfaceadhesionandfiltration.Theresultsshowedthatthecorrespondingaveragediameterandthedensityofmicrobubbleswere72.0μmand2.1×108ind./Lrespectivelyatapressureof0.42MPa.Undertheoptimaloper-atingconditions5m/hhydraulicloading130%refluxratiotheremovalrateofChl-awas93.4%.AsoneoftheemergencytreatmentsforalgaebloomsduringtheShanghaiExpothetechniqueprovidesreferenceandtechnicalsupportforthequalitycontroloftheurbanlandscapewater.Keywordsurbanlandscapewateralgaeremovalhighdensitymicrobubblefiltrationrap-idseparation———2007BAK27B051。、、23。、·41·第30卷第7期2014年4月中国给水排水CHINAWATER&WASTEWATERVol.30No.7Apr.2014、。1试验材料与方法1.1a17.2~105.4μg/L47.8μg/L8×107/La。1.2120FPD04Z、60mm、2150mm。。1Fig.1Schematicdiagramofhighdensitymicrobubblefiltrationprocess、。7%、0.32~0.42MPa。1.3a《》44。2VisualBasicSPSS。2Fig.2Schematicdiagramofdynamicmicroscopictestingdevice2结果与讨论2.10.32、0.34、0.36、0.38、0.40、0.42MPa3。3Fig.3Effectofpressureonaveragediameteranddensityofmicrobubbles30.32MPa0.42MPa112.1μm72.0μm3.6×107/L2.1×108/L、。·51·.watergasheat.com徐竟成,等:高密度微气泡过滤快速分离城市景观水体藻类第30卷第7期、5。2.25m/h、130%a。112.1μm72.0μma72.5%94.0%。6。7。a4。a8。0.42MPa。4aFig.4EffectofdensityandaverageintervaldistanceofmicrobubblesonremovalofChl-a2.37%、0.42MPa。、、。2.3.15m/h50%、70%、90%、110%、130%a85。5aFig.5EffectofrefluxratioonremovalofChl-a5a130%a2.9μg/La/。。130%、a。2.3.2130%5、6、7、8m/ha8。5m/ha0.5~4.7μg/L93.4%8m/ha2.0~10.5μg/L85.5%。-。5m/h。·61·第30卷第7期中国给水排水.watergasheat.com2.3.3130%、5m/ha6。6aFig.6RelationshipbetweenChl-aandheightofmicrobubblelayer6a。0~80cma80cm。。3结论①、。a。②0.42MPa、5m/h、130%>80cma93.4%。③。1KiuriHJ.Developmentofdissolvedairflotationtechnol-ogyfromthefirstgenerationtothenewestthirdoneDAFinturbulentflowconditionsJ.WaterSciTech-nol20014381-7.2GaoSSYangJXTianJYetal.Electro-coagulation-flotationprocessforalgaeremovalJ.JHazardMater20101771/3336-343.3.J.2008241172-75.4.4M.2002.5EdzwaldJK.DissolvedairflotationandmeJ.WaterRes20104472077-2106.6AtaSJamesonGJ.TheformationofbubbleclustersinflotationcellsJ.IntJMinerProcess2005761/2123-139.7.D.2004.8SalasM.J.20067973-77.1961-、。2030、980。E-mailxujick@tongji.edu.cn2013-10-12·71·.watergasheat.com徐竟成,等:高密度微气泡过滤快速分离城市景观水体藻类第30卷第7期