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1、ADissertationSubmittedinPartialFulfillmentoftheRequirementsfortheDegreeofMasterinEngineeringThepreparationandcharacterizationofdiatomitecompositeabsorbentanditsstudyontheadsorptionpropertiesMasterCandidate:YiyuanWuMajor:EnvironmentalEngineeringSupervisor:Prof.NingDuanWuhanUni
2、versityofScienceandTechnologyWuhan,Hubei430081,P.R.ChinaMay24,2015摘要近幾年國內(nèi)外各水域富營養(yǎng)化嚴重,磷是導致富營養(yǎng)化現(xiàn)象產(chǎn)生的重要原因。因此研發(fā)高效吸附材料是控制此種環(huán)境污染的研究熱點。本文研究內(nèi)容如下:(1)將基材硅藻土,與輔材鋼渣、粉煤灰進行復合燒結(jié),制取顆粒吸附材料。綜合對比不同輔材時的吸磷性能,確定選用鋼渣作為制備復合吸附材料的輔材。(2)通過制備條件的單因素試驗和正交試驗,綜合材料強度和吸磷性能,確定其最佳制備條件為:質(zhì)量配比6:4,黏結(jié)和致孔材料含量分別為25%和8%
3、,燒結(jié)時間和溫度分別為120min和700℃。(3)通過試驗分析,溫度為25℃、投加量22.5g/L、pH=7、吸附時間為16h時,復合吸附材料吸磷效果最佳。(4)通過復合吸附材料的靜態(tài)浸出試驗,得出復合吸材料能提供生成鈣磷沉淀的微環(huán)境,并且供鈣釋堿的穩(wěn)定性影響吸磷效果。復合吸附材料的供鈣釋堿動力學分析說明,其供鈣過程為慢反應(yīng)擴散機制。(5)通過吸磷性能機理試驗分析表明,吸磷過程可用L型等溫方程以及準二級動力學描述,溫度升高而吸附量增加。熱力學分析,其對磷的吸附是吸熱過程,反應(yīng)自發(fā)進行,對溫度輕度敏感的。吸磷時同時存在物理吸附和化學吸附,以化學吸
4、附為主,主要是生成了磷酸鈣等沉淀。復合吸附材料吸磷飽和后,在蒸餾水中的解吸率很低,穩(wěn)定性好,在3%HCl溶液中解吸率可以達到70%以上,可回收利用。關(guān)鍵詞:硅藻土;復合吸附材料;吸磷;機理IAbstractPhosphorusisoneoftheimportantcausesfortheeutrophicationwatersathomeandabroadinrecentyears.Thereforethedevelopmentoftheadsorbentmaterialisresearchfocusaboutcontrolofeutrophic
5、.(1)Diatomitewasadoptedasbasicmaterialtodevelopparticleadsorptionmaterialsbycombiningflyashandsteelslag,respectively.Throughcomparisonofdifferentcomplementarymaterial,Steelslagwasidentifiedastheauxiliarymaterialusedforthepreparationofcompoundadsorptionmaterial.(2)Throughsingl
6、efactorexperimentandorthogonalexperimentaboutpreparationconditions,ComprehensivecomparisonoftheanalysisresultsofStrengthofmaterialsandadsorptionproperties,theoptimumpreparationprocessconditionsforparticleadsorptionmaterialswasamixingratioof6:4,25%bondmaterial,8%pore-foamingag
7、ent,aroastingtemperatureof700℃,aroastingtimeof120min.(3)Theoptimumconditionsthattheparticleadsorptionmaterialsremovedphosphorusinwastewaterwerethattheadsorptiontemperatureof25℃,theusageofadsorptionmaterialswas22.5g/L,pH=7,theadsorptiontimeof960min,phosphorusremovalrateisthebe
8、st.(4)Throughthestaticleachingexperimentalofthecompositeadsorptionma