高气泡表面积通量浮选柱气浮除藻的研究

第7卷第9期环境污染治理技术与设备Vol.7,No.92006年9月TechniquesandEquipmentforEnvironmentalPollutionControlSep.2006高气泡表面积通量浮选柱气浮除藻的研究陈泉源朱凌云M.Salas(东华大学环境科学与工程学院,上海200051)(柏林工业大学化学工程系,德国)摘要湖泊、水库等水源的富营养化,使藻类去除成为饮用水生产的重要任务。本研究采用高气泡表面积通量浮选柱气浮除藻,考察了混凝剂、气泡表面积通量和浮选柱高度等因素的影响。试验表明,高气泡表面积通量浮选柱气浮可高效地去除绿藻、硅藻和蓝藻,叶绿素a和藻类去除率达95%以上,比传统浮选柱气浮和沉降作业有较大幅度提高。与普通气浮柱比较,高气泡表面积通量浮选柱增加了气泡与藻的碰撞几率,防止因大表观充气速率造成的紊流和扰动,使气泡/藻结合体有相对静态的浮升环境,避免了气泡/藻结合体在浮升过程中的脱落,实现对藻类的迅速捕集和转移。关键词水处理气泡表面积通量浮选柱藻叶绿素a中图分类号X703文献标识码A文章编号1008-9241(2006)09-0073-05ApplicationofcolumnflotationwithhighbubblesurfaceareafluxforalgaeremovalfromsourcewaterChenQuanyuan1ZhuLingyun1M.Salas2(1.SchoolofEnvironmentalScienceandEngineering,DonghuaUniversity,Shanghai200051;2.SchoolofChemicalEngineering,TUBerlin,Germany)AbstractRemovalofalgaeincludingcyanophyta,chlorophytaandeuglenafromsourcewaterisessentialtotheproductionofdrinkingwaterduetosevereeutrophicationoflakesandreservoirs.Thispaperdescribestheflotationcolumnwithhighbubblesurfaceareafluxandtheeffectsofparameterssuchasthedosageofcoagulant,bubblesurfaceareaflux,andcolumnheightontheremovalefficiencyofalgae.Thereasonablearrangementofmulti-spargerscanalsoexcludeintensivedisturbance,whichisunabletobeavoidedintraditionalflotationfacili-tiescausedbyhighsuperficialgasvelocity,andcreatefavorablestaticenvironmentfortheattachmentandfloat-ingofbubble-algaeflocsinthecolumn.Theflotationresultsconfirmedthatthecolumncangeneratesufficientandveryfinebubblesathighsuperficialgasvelocitytoincreasethecollisionpossibilityofbubbleandalgae.Thisnewequipmenthasshowntobecapableofachievingchlorophllaandalgalremovalefficienciesofover95%.Itisconcludedthattheperformanceofcolumnflotationwithhighbubblesurfaceareafluxinalgalremovalfromsourcewaterismuchhigherthanthatofconventionalcolumnflotationorthatoftraditionalsedimentation.Keywordsdrinkingwatertreatment;bubblesurfaceareaflux;columnflotation;algae;chlorophylla收稿日期:2005-12-04;修订日期:2006-05-14作者简介:陈泉源(1962～),男,博士,教授,主要从事污染控制的教学和研究工作。E-mail:qychen@dhu.edu.cn含氮、磷等营养物质的城市生活污水和工农业生产污水流入水体,促使藻