29种湿地填料对氨氮的吸附解吸性能比较

29820168ＲesearchofEnvironmentalSciencesVol．29No．8Aug．2016．29J．20162981187-1194．LUShaoyongWANZhengfenLIFengminetal．Ammonianitrogenadsorptionanddesorptioncharacteristicsoftwenty-ninekindsofconstructedwetlandsubstratesJ．ＲesearchofEnvironmentalSciences20162981187-1194．2015-[e-mail]．29112221．1000122．266100-29、NH3-N-．、、、、、、、、FreundlichLangmuirNH3-NLangmuirNH3-N51.7000mgg、1.6200mgg、1.3530mgg、1.3500mgg、1.1900mgg．NH3-N．、、、、、NH3-N20%NH3-N24.50%35.51%．、、、NH3-N．、、、NH3-N．X7031001-6929201608-1187-08ADOI10.13198j．issn．1001-6929．2016．08．11AmmoniaNitrogenAdsorptionandDesorptionCharacteristicsofTwenty-NineKindsofConstructedWetlandSubstratesLUShaoyong1WANZhengfen12LIFengmin2ZHANGXueqing21．StateEnvironmentalProtectionScientificObservationandＲesearchStationforLakeDongtinghuSEPSOＲSLDStateEnvironmentalProtectionKeyLaboratoryforLakePollutionControlStateKeyLaboratoryofEnvironmentalCriteriaandＲiskAssessmentChineseＲesearchAcademyofEnvironmentalSciencesBeijing100012China2．KeyLaboratoryofMarineEnvironmentalScienceandEcologyMinistryofEducationCollegeofEnvironmentScienceandEngineeringOceanUniversityofChinaQingdao226100ChinaAbstractTheporosityhydraulicconductivityandadsorptionanddesorptioncharacteristicsofammonia-nitrogenNH3-Nintwenty-ninekindsofmaterialswereanalyzedtodeterminemoreeffectiveconstructedwetlandsubstratesforadsorbingNH3-N．Theresultsshowedthattheporosityofsawdustvitroliteeggshellporcelainceramistandvolcanicrockwerelargerwhilethepermeabilityofceramsitespongeironlimestoneshaleceramsiteandgravelwerehigher．FreundlichandLangmuirisothermscouldadequatelypredicttheadsorptionprocess．AccordingtotheestimatesfromtheLangmuirisothermthemaximumtheoreticalsaturatedcapacitiesdecreasedinthefollowingordervolcanicrock1.7000mgg＞porcelainceramist1.6200mgg＞biochar1.3530mgg＞zeolite1.3500mgg＞garnet1.1900mgg．IngeneraltherewerethreekindsoftrendsofNH3-Nadsorptionratesinsubstratesonewasfirstincreasethendecreaseandfinallytendedtobalancesecondwasfirstincreasethentendedtobalanceandthirdwasfirstincreasethendecreaseandfinallyincrease．Thevariationofadsorptionratewascloselyrelatedtoeachsubstrate’sadsorptionmechanism．Adsorptionsaturatedsubstratessuchasbiocharcokedaliclaymaifanstoneanthracitezeolitemagnetiteandquartzadsorbed29NH3-Nmainlythroughionexchangewhichismorestablewithsmallerdesorptionrates＜20%．ClayceramsiteandvolcanicrockadsorbedNH3-Nthroughcombinedphysicaladsorptionandionexchangewithdesorptionratesof24.5%and35.1%respectively．VolcanicrockporcelainceramistbiocharandzeoliteshowedhigheradsorptionefficiencywhentreatingwastewaterwithhighconcentrationofNH3-N．Consequentlyvolcanicrockporcelainceramistbiocharzeoliteareappropriatesubstratesforconstructedwetlands．Keywordsconstructedwetlandsubstrateammonia-nitrogenadsorptiondesorptionρNH3-N0.2mgL1．、、、2-3NH3-N．NH3-N、、、．NH3-N、4、5、、6-8、8．、、、、9-10NH3-N60%11-13141516-17．NH3-N18．19、18-20．．29NH3-N．11.11～2mm、、、、、、、、、、2～4mm、、、、、、、、、、3～5mm、、、1mm、、．．ρNH3-N2122．50mm5L5L．1．Φ=V0V×100%1Ф%V0LVL．．．A、L．s=VW·LA·△h·t2scmsAcm2LcmVWtcm3△hcm．1.2LangmuirFreundlich23-24Q=QmaxKC1+KC3q=kC1n4QNH3-NmggQmaxNH3-NmggCmgLKnk．1.38811829105℃2h1g50mLρ0、5、8、15、25、30、60、80mgLNNH4Cl20mL25℃、175rmin24h5000rmin15minρNH3-N．0.02molLCaCl225℃、175rmin24h5000rmin15minρNH3-N．22.11、229．25．．、26．27、、、、、、、．．1、2、、、、、、、、50%、、、、、、、、、0.2760cms、、、、、．、、40%40%～50%．28．293%～44%．10d3.530．、、、、．1Table1Porosityandhydraulicconductivityoftenkindsofnon-naturalsubstrates%cms53.980.289343.620.384362.920.561342.160.125863.860.067432.70—51.060.276052.400.008821.260.249050.000.07632Table2Porosityandhydraulicconductivityofnineteenkindsofnaturalsubstrates%cms42.120.179760.840.116645.080.412645.300.155048.460.362537.740.148645.580.129940.960.259663.200.312480.400.090058.300.514843.750.001544.000.218040.000.060046.400.238044.120.106746.420.288545.600.102643.600.36642.2NH3-N110NH3-N＞＞＞＞＞＞＞＞＞、、、、、、NH3-N0.3mgg．20．、、ρNH3-N．ρNH3-N15mgL、、9811293NH3-N．1Fig.1Isothermaladsorptioncurvesoftenkindsofnon-naturalsubstrates18-201mm、、、NH3-NNH3-NρNH3-N．219ρNH3-NρNH3-N60mgL、、、、、、ρNH3-N、、、、、、、、、NH3-N．ρNH3-N0～30mgL、、、ρNH3-N30～60mgLρNH3-N60mgL．、、、ρNH3-N30mgL8．、、、、ρNH3-NNH3-N．、、NH3-N、9．Langmuir31．Freundlich2Fig.2Isothermaladsorptioncurvesofnineteenkindsofsubstrates32-34．LangmuirFreundlich3．3NH3-NQmax462035、、、、、、、．36．、、、、、、、、、、、、、LangmuirFreundlichLangmuir．FreundlichkNH3-NkNH3-N37．FreundlichＲ2＞0.9、、、kNH3-N1n1n138．NH3-NNH3-N．2.3NH3-NNH3-N4、5．NH3-NNH3-N09118293NH3-NTable3NH3-Nadsorptionmodelandrelatedparametersoftwenty-ninekindsofsubstratesmmLangmuirFreundlichQmaxmggKＲ2knＲ22～40.68300.02260.89200.03501.7100.86333～50.03670.07280.89270.00682.7900.63862～40.45830.00430.94590.00251.1400.92562～40.23790.00580.95140.00181.1600.85631～20.15320.00770.81310.00161.2000.75391～20.13150.03920.97180.01302.1000.92461～21.35000.01450.93100.03691.4550.88102～40.09800.04150.85100.00942.0600.65901～20.27880.01780.89000.01121.6150.85602～40.08060.03310.89520.00601.8870.74881～20.12230.00920.89800.00171.2640.84802～40.19100.00600.96810.00171