溷凝沉淀过程中铝系溷凝剂铝迁移转化规律.pdfVIP

中国化学会第七届水处理化学大会暨学术研讨会论文集 混凝沉淀过程中铝系混凝剂的铝的迁移转化规律 赵坐夏，王茜2，杨宏伟’，蒋展鹏’‘ (1.清华大学环境科学与工程系，北京100084;2.北京工业大学环境与能源工程学院，北京 100022) 摘要:铝的毒性不仅取决于总铝浓度，还与其形态密切相关。通过模拟配水，研究了硫酸铝和氯 化铝两种单体态铝以及分别以AI。和AI。为优势形态的两种聚合氯化铝(PAC)在混凝过程中铝的迁 移转化规律，并研究了原水浊度和DOC对残余铝形态分布的影响。结果表明:在低浊体系中， 投加铝系混凝剂是导致出水余铝升高的主要原因:但在高浊体系中，铝系混凝剂，尤其是聚合铝 具有一定的除铝功能。混凝沉淀过程中单体铝混凝剂的的残余铝总量明显高于聚合铝混凝剂的残 余铝总量。聚合铝的残余铝全部为悬浮态铝。单体铝混凝剂的残余铝中还存在着胶体态铝和溶解 态铝。原水浊度和DOC浓度增加，会提高残余铝中胶体态铝和溶解态铝的含量。 关键词:残余铝，铝形态，铝系混凝剂，混凝沉淀 TransportandtransformationofaluminumofAI-basedcoagulantsincoagulationandsedimentationprocess. ZHAOHua-zhang,WANGQian,YangHong-weit,IIANGZhan-pengt (1.DepartmentofEnvironmentalScienceandEngineering,TsinghuaUniversiyt,Beijing100084,China;2.Collegeof EnvironmentalandEnergyEngineering,BeijingUniversiytofTechnology,Beijing100022,China) Abstract:Thetoxiciytofaluminumisnotonlydeterminedbythetotalaluntinumconcentration,butalsocloselyrelated tothealuminumspecies.Incoagulationandsedimentationprocess,thetransportandtransformationofbothaluminumof monomericaluminumcoagulants,whichincludesaluminumsulfateandaluminumchloride,andpolymericaluminum coagulantswithAlbandAlrasthepredominantspeciesrespectivelywasstudiedbysimulatedrawwaterinthispaper. TheinfluencesofturbidiytandDOCinrawwateronthespeciesdistributionofresidualaluminumwereinvestigatedas well.Theexperimentalresultsshowthat,inthecoagulationsystemwithlowturbidiyt,itistheuseofAI-basedcoagulants thatcontributesmoretotheincreaseofresidualaluminumwhileintheonewithhighturbidiyt,theAI-basedcoagulants, especiallypolymericaluminumcoagulantshaveafunctiontoremovealuminumfromthewater.Theresidualaluminum concentrationofmonomericaluminumcoagulantsishigherthanthatofpolymericones.Alltheresidualaluminumof polymericcoagulantsissuspendedaluminum.Besidessuspendedaluminum,therearecolloidalaluminumandsoluble aluminumintheresidualaluminumofmonomericcoagulants.Theconcentrationsofcolloidalaluminuman