铁离子促进悬浮载体挂膜的机理研究

铁离子促进悬浮载体挂膜的机理研究黄理辉1,2,　马鲁铭2,　张　波1,　高宝玉1(1.山东大学环境科学与工程学院,山东济南250100;2.同济大学环境科学与工程学院,上海200092)　　摘　要:　从铁离子影响生物膜中胞外聚合物形成的角度,通过对比试验研究了铁离子促进填料挂膜的机理。结果表明,含较多铁离子的污水可提高填料上的生物膜量,并使生物膜具有更高的除污能力。铁离子可增加生物膜中胞外聚合物的含量,特别是蛋白质的含量,而胞外聚合物的凝聚作用可提高填料的挂膜速度及填料上附着的生物量;又因蛋白质中含有大量生物催化酶,故可增强生物膜的除污能力。铁离子作为胞外聚合物的连接剂,更多地与糖类官能团连接在一起,胞外多糖可能与生物膜的附着性能有关。　　关键词:　铁离子;　生物膜;　胞外聚合物中图分类号:X703　　文献标识码:C　　文章编号:1000-4602(2007)09-0106-03StudyonPromotionMechanismofFeIonforBiofilmFormationonSuspendedCarrierHUANGLi2hui1,2,　MALu2ming2,　ZHANGBo1,　GAOBao2yu1(1.SchoolofEnvironmentalScienceandEngineering,ShandongUniversity,Jinan250100,China;2.SchoolofEnvironmentalScienceandEngineering,TongjiUniversity,Shanghai200092,China)　　Abstract:　BasedontheeffectofFeionontheformationofextracellularpolymericsubstances(EPS)inbiofilm,thepromotionmechanismofFeionforbiofilmformationonsuspendedcarrierwasstudiedthroughcontrasttest.TheresultsshowthatwastewaterwithhighFeionconcentrationcanimprovethebiomassonthecarrierandincreasethecontaminantremovalabilityofthebiofilm.FeioncancauseanincreaseoftheEPSconcentrationinbiofilm,especiallyproteinconcentration.CoacervationfunctionofEPScanpromotethebiofilmformationrateandincreasethebiomassonthecarrier.Becauseproteincon2tainsgreatquantityofbiologycatalyzeenzyme,contaminantremovalabilityofthebiofilmcanbefurtherimproved.AsconnectionmatterofEPS,moreFeioneasilyconnectswithglucidefunctionalgroup,andextracellularamylosemayberelatedtotheattachmentcapabilityofbiofilm.　　Keywords:　Feion;　biofilm;　extracellularpolymerics