新型中置式高密度沉淀池优化投药试验研究_芮旻

给水排水Vol.33No.12200713新型中置式高密度沉淀池优化投药试验研究芮旻1姚洁1许嘉炯1沈裘昌1郑国兴1查人光2(1上海市政工程设计研究总院,上海200092;2嘉兴市嘉源给排水有限公司,嘉兴314000)摘要通过小试和生产性试验对新型中置式高密度沉淀池的投药系统(包括回流污泥、混凝剂及助凝剂PAM的投加)进行了详细研究。小试研究表明回流污泥和混凝剂投加量的增大降低了上清液浊度,PAM的投加略微降低了上清液出水浊度,但影响不大。生产性试验研究结果表明,实际生产运行中可灵活利用回流污泥来提高絮凝效果,在合理的范围内回流污泥投加量越大,絮凝效果越好;沉淀池随着混凝剂投加量的增大,出水浊度逐渐降低,同时,不同的回流污泥投加量条件下混凝剂投加对沉淀池出水浊度的影响表现出不同特性;增大PAM投加量对直接提高沉淀池的絮凝效果以及降低出水浊度的贡献不明显,PAM投加量的增大间接引起回流污泥投加量变大是导致出水浊度变小的原因。关键词中置式高密度沉淀池高效絮凝浊度Optimizationofagentsadditionprocessesforhighefficiencymid-flocculation-sedimentationtankRuiMin1,YaoJie1,XuJiajiong1,ShenQiuchang1,ZhengGuoxing1,ZhaRenguang2(1.ShanghaiMunicipalEngineeringDesignGeneralInstitute,Shanghai200092,China;2.JiayuanWaterandWastewaterCo.,Ltd.,Jiaxing314000,China)Abstract:Agents(coagulantsandcoagulantaidsPAM)additionandactivatedsludgerecycleprocessesforhighefficiencymid-flocculation-sedimentationtankwereinvestigatedinthisstudybyemployingexperimentsofbothlaboratoryandfull-scale.Laboratoryexperimentsresultsshowedthatincreasingdosagesofactivatedsludgeandcoagulantsdecreasedtheturbidityinsupernatantfluid.AdditionofPAMslightlydecreasedtheturbidityofsupernatantfluid.Infurther,full-scaleexperimentsbasedonlaboratoryexperimentswerecarriedouttoeliminatelimitsoflaboratoryexperiments.Itwasfoundthatactivatedsludgecouldbeusedtoimprovecoagulationefficiencyinpracticaloperation.Withinacertainrange,increasingthedosageofactivatedsludgecouldleadtohighercoagulationefficiency.Turbidityofoutflowapparentlydecreasedwithincreasingofcoagulatesdosageinsedimentationtank.Inthemeanwhile,undertheconditionofvarioussludgedosages,differenteffectsofcoagulantsonoutflowturbiditywereobserved.ComparedtocoagulationefficiencycontributedbyPAMdirectly,thatitwastheincreasingsludgedosageindirectlycausedbyPAMdosageincreasingthatresultedindecreasingofoutflowturbidity.Keywords:Highefficiencymid-flocculation-sedimentationtank;Highefficiencycoagulation;Turbidity0引言早期的沉淀型式主要采用单层平流沉淀池,大约半个多世纪前出现了以提高流速为主的澄清池。美国开发了机械搅拌澄清池,前苏联推广了悬浮澄DOI:10.13789/j.cnki.wwe1964.2007.12.00614