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1、XXX毕业设计焦作市温县县城给水工程初步设计摘要:地上式溶解氧法除铁除、锰工艺流程,有几种形式。选用什么样的流程主要取决于原水的化学成分,如水的碱性;铁和锰的含量。当水中碱度大于2.0mg/l;铁小于2.0mg/l;锰小于1.5mg/l时可采用简单曝气一级过滤法处理,达到除铁、除锰的目的。当水中铁的含量大于5mg/l;锰大于1.5mg/l时一般采用二级过滤工艺,一级过滤先除铁,二级过滤再除锰原因是当铁和锰同时存在于水中时,铁能干扰锰的去除,特别是铁和锰的含量较高时,除锰就更困难。必须采用曝气→一级过滤→二次曝气→二次过滤
2、工艺流程,方能将水中的铁和锰除去,若采用曝气→一级过滤的简单工艺是不可能达到除锰的目的。为了尽可能除锰,一级除铁后的过滤出水,应增加了机械强制曝气措施,其目的有二个,一是尽量除去一级处理出水中的二氧化碳,提高水的PH值(据有关资料介绍,表面曝气法可以去除50%-70%的二氧化碳);二是尽可能的向一级出水中充氧(溶解氧饱和度可达80%-90%),将水中的二价锰大部分氧化成三价锰,然后进入二级过滤时,将水中的锰和一级过滤后残留在水中的铁彻底除去,保证出水水质。关键词:溶解氧法,除铁,除锰,曝气,二级过滤第58页共43页XXX
3、毕业设计Abstract:Ground-DOActiron,manganeseprocess,thereisseveralforms.Whatkindofselectionprocessmainlydependsontheoriginalchemicalcompositionofwater,aswateralkaline;Ironandmanganesecontent.Whenalkalinityislessthan2.0mg/l;Rail2.0mg/l;Manganeseislessthan1.5mg/ldealswi
4、thasimpleaerationfilter,inadditiontoiron,andmanganesefromthepurpose.Whenthewatercontentoftheironmanganesethan5mg/l;than1.5mg/lwhentwocommonlyusedfilteringtechnologyInadditiontoafirstfilterironandtwofilteredmanganesereasonisthatwhenironandmanganeseexistinthewater,
5、caninterferewithironmanganeseremoval,especiallyironandmanganesecontentishigh,withtheexceptionofmanganeseisevenmoredifficult.Itismusttogetaaerationsecondaerationfilter→secondaryfiltrationprocess,inordertothewatertoremoveironandmanganese.Ifusingaeration→asimplefilt
6、eringprocessisunlikelytobeabletoachievethepurposeofmanganese.Totheextentpossible,manganese,ironafterafilterfromthewater,shouldincreasethemandatorymechanicalaerationmeasures,thepurposeofwhichistwo.First,asatreatmenttoremovecarbondioxidefromthewater,raisingthepHofw
7、ater(accordingtotheinformationsheets,surfaceaerationmethodcanremovethecarbondioxide50%-70%);Second,asmuchaspossibleoutofthewatertoa256(dissolvedoxygensaturationofupto80%-90%)Waterwillbethetwomostmanganeseoxideofmanganeseintothree,andthenentertwofilters,ofmanganes
8、einwaterfiltrationandaresidueofironinthewaterremovedcompletely,andensurewaterquality.Keywords:DOAct,removingiron,removingmanganese,aeration,secondaryfilter第58页