氨氮在天然沸石上的吸附及解吸张曦

　　1)张　曦　吴为中　温东辉　李文奇　唐孝炎(,,100871)　　、、、,HClNaCl,.,,,11.5mg·g-1;(0—8h),,;,K+50%;HClNaCl,60%;,120h9mg·l-1,27%.　,,,,.,(SiO),Si4+Al3+,,,().,、[1,2],:Cs+Rb+K+NH+4Ba2+Sr2+Na+Ca2+Fe3+Al3+Mg2+Li+,[3,4].、、、,,,,.1　1.1　(:Na6[(AlO2)6(SiO2)30]·24H2O).:Si/Al4.2—5.3,2—3cm,30—40%,3.9.30g500ml,(C0)NH4Cl200ml,,,72h,15min,NH3-N(Ce),NH3-N2002517.1):“”(K99053502).22　22003　　3　　　ENVIRONMENTALCHEMISTRYVol.22,No.2　March　　2003　.NH4Cl、、、,.(Γ,mg·g-1):Γ=(C0-Ce)V/m,C0:NH4Cl,mg·l-1;Ce:NH4Cl,mg·l-1;V:,l;m:,g.1.2　NH3-N,75℃12h,.,NaClHCl72h,,(η,%).η=(1-Γ/Γ0)×100%,Γ0:,mg·g-1;Γ:,mg·g-1.1.3　,30g5g·l-1NH4Cl,,3d,,NH4Cl,75℃12h,,500ml50mg·l-1NH4Cl,20℃,pH、(DO)NH3-NNO-3-N,.2　2.1　1NH3-N5mg·l-1—10g·l-1NH4Cl.1,,.NH3-N1000mg·l-1,,,;NH3-N1000mg·l-1,;NH3-N5000mg·l-1,,,11.5mg·g-1.,,,10℃,.Freundlich[5],.Freundlich(Γ=KC1/n),,1.1　Table1　AdsorptionequationsinthedifferenttemperaturesT/℃Kn25lnΓ=0.8005lnC-4.43890.98830.01181.249235lnΓ=0.7916lnC-4.33170.98830.01311.263345lnΓ=0.7915lnC-4.24790.98500.01431.2634167　2　　　　　　　　　　:　　.,,,,,;,,,.2pH,pH.,,Na+NH+4,pH.1　Fig.1　Adsorptionisothermsofammonia-nitrogenontothezeoliteinthedifferenttemperatures2　pHFig.2　pHvaluesinNH4Clsolutionbeforeandafteradsorption2.2　325℃,5mg·l-1.(0—8h),,,8—48h,“,”.,,:dΓ/dt=Γ/(σt).Γ,t,σ.:lnΓ=0.132lnt-3.8412(r=0.9715).2.3　　　,K+,.K+,Na+,Ca2+,Mg2+(0.1mol·l-1),5mg·l-150mg·l-1,.4.4,,,K+,50%,Na+,Ca2+,Mg2+,.2.4　　　,,,.5250mg·l-1NaClHCl.HCl,NaCl,60%,168　　　　　　　　　　　　　　　　　　　　22H+Na+NH+4;,,,,,,,,,.3　Fig.3　Curveofadsorptioncapacityvariationwithtime4　Fig.4　Effectsofcoexistingcationsontheadsorptioncapacity5　Fig.5　Effectsofdifferentsolutiononthedesorptionefficiency2.5　,.,,,,,,.,.6,pH,NH4Cl,,,,pH.,,,pH;,,DO,.7,,120h9mg·l-1,27%(2),.169　2　　　　　　　　　　:6　pHDOFig.6　pHandDOofsolutionswithinthenitrificationprocess7　NH3-NNO-3-NFig.7　NH3-NandNO-3-Nconcentrationsvariationwithinthenitrificationprocess2　Table2　RatioofNH3-N,NO-2-NandNO-3-Nintotalnitrogenwithinthenitrificationprocesst/h02472120216360ηNH3-N/%10089.7882.2772.7871.8371.67ηNO-2-N/%00.080.130.140.170.22ηNO-3-N/%010.1412.6027.0828.0028.123　(1),,Freundlich.pH,Na+NH+4.(2)“,”,(0—8h),,.,,K+,50%.(3)HCl,NaCl,60%;.(4),,20℃120h9mg·l-1,27%;pHDO.　　　[1]　ZorpasA,ConstantinidesT,VlyssidesAGetal.,HeavyMetalUptakebyNaturalZeoliteandMetalsPartitioninginSewageSludgeCompost[J].BioresourceTechnology,2000,72∶113—119170　　　　　　　　　　　　　　　　　　　　22[2]　OrtegaE,CheesemanC,KnightJetal.,PropertiesofAlkali-ActivatedClinoptilolite[J].CementandConcreteRe-search,2000,30∶1641—1646[3]　,,,[J].,1996,17(2)∶9—11[4]　LahavO,GreenM,AmmoniumRemovalUsingIonExchangeandBiologicalRegeneration[J].WaterResearch,1998,32(7)∶2019—2028[5]　,,[M].:,1983,32,48ADSORPTIONANDDESORPTIONOFAMMONIA-NITROGENONTONATURALZEOLITEZHANGXi　　WUWei-zhong　　WENDong-hui　　LIWen-qi　　TANGXiao-yan(CenterofEnvironmentalSciences,PekingUniversity,Beijing,100871)ABSTRACTTheeffectsofammonia-nitrogenconcentration,temperature,time,coexistingcationsontheadsorptionofammonia-nitrogenontothenaturalzeolitewerestudied,whiletheeffectsofHClandNaClsolutiononthedesorptionofammonia-nitrogenfromthenaturalzeolitewerediscussedrespec-tively.Nitrificationofammonia-nitrogenonthezeoliteinNH4Clsolutionwasalsoresearched.Withammonia-nitrogenconcentrationortemperatureincreasinginNH4Clsolution,adsorptioncapacityofzeolitewouldrisetothemaximumvalueof11.5mg·g-1.Inthebeginningoftheadsorptionprocess(0—8hour),adsorptioncapacityofzeolitewouldriseobviously,andafterthisperiod,itwouldriseslowly.DuetothecoexistingofK+,adsorptioncapacityofzeolitecoulddecrease50%.ComparedtotheNaClsolution,HClsolutionhadabettereffectonthedesorptionofammonia-nitro-genwiththemaximumdesorptionefficiencyof60%.Ammonia-nitrogenonthenaturalzeolitecouldbetransformedtonitrate-nitrogenundertheeffectofnitrificationbacteria,andtheconcentrationofnitrate-nitrogeninNH4Clsolutioncouldreach9mg·l-1in120hourswiththeratioof27%intotalnitrogen.Keywords:ammonia-nitrogen,zeolite,adsorption,desorption,nitrification.171　2　　　　　　　　　　: