粉煤灰沸石的合成及其在污水同步脱氨除磷中的应用

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1、上海交通大学硕士学位论文粉煤灰沸石的合成及其在污水同步脱氨除磷中的应用姓名：赵统刚申请学位级别：硕士专业：环境科学与工程学指导教师：吴德意20060101上海交通大学硕士学位论文摘要范围时去除率增加（最高达到近100%）。合成沸石对氨氮的吸附为放热反应，对磷的吸附为吸热反应。不同阳离子饱和的合成沸石对氨氮的吸附顺序依次为：Al>Mg>Ca>Na>Fe，对磷的吸附顺序则为：Al>Fe>Ca>Mg>Na。合成沸石的氨氮吸附机理为阳离子交换作用，对磷的去除除化学沉淀作用外尚有吸附机制。(3)合成沸石对实际污水中氨氮和磷酸盐

2、有较好的去除效果，进水pH、氨氮、磷浓度和水力负荷对沸石颗粒柱的同步脱氨除磷效果都有影响；污水中的阳离子浓度对沸石的氨氮吸附容量有较大影响，不调节进水pH时，颗粒态沸石磷去除率偏低，调节至酸性或碱性状态时，去除率明显上升。摘要：合成沸石，粉煤灰，氨氮，磷酸盐，性质，机理II上海交通大学硕士毕业论文ABSTRACTSYNTHESISOFZEOLITEFROMFLYASHANDITSAPPLICATIONINTHESIMULTANEOUSREMOVALOFAMMONIUMANDPHOSPHATEABSTRACTTheac

3、cumulationofthenitrogenandphosphoruscancauseeutrophicationinlakesandestuaries.Therefore,theremovalofthenutrientsfromwastewaterbeforedischargehasbeenthehighlightofresearchinrecentyears.Inthisstudy,thehydrothermalconversionofaChineseflyashintozeolitehasalsobeenin

4、vestigatedintensivelyasafunctionoftemperature,liquid/solidratio,NaOHconcentrationandreactiontimeinaclosedretort.Cationexchangecapacity(CEC)andphosphateadsorptioncoefficient(PAC)ofsynthesizedzeoliteweredeterminedandthecharacteristicsandmechanismonthesimultaneous

5、removalofammoniumandphosphateinthedomesticwastewaterwerealsoprobed.Themainconclusionsareasfollows:(1)Thecrystallizationofzeoliteismainlysubjecttothetemperature.Thetypeofzeolitemainlydependsontheliquid/solidratio,andwhileNaOHconcentrationandreactiontimeaffectedb

6、othofthem.TheCECvalueofsynthesizedzeoliteincreasedgreatlyasafunctionoftemperature,liquid/solidratioandreactiontimeuntilthetemperatureof110℃,theIII上海交通大学硕士毕业论文ABSTRACTratioof2.5andthetimeof16hwerereached,andthentheincreasesloweddown.TheCECvalueofsynthesizedzeoli

7、teincreasedinitiallywiththeincreaseofNaOHconcentration,reachedthemaximumvalueata－1concentrationof2molL,andthendecreasedsharplywiththeincreasingconcentration.TherelationshipofPACandsynthesisconditionsiscomplicated,dependingonthedissolutionofflyashandtheformation

8、ofintermediateduringthezeolitesynthesis.(2)Theamountofammoniumandphosphateadsorbedbyzeolitizedflyashvariedwithtime,andapproachedtoaconstantvalueafter24h.Theamountofammoniuma