EPS与阳离子对活性污泥沉降性能的影响研究

EPS龙向宇1,2,方振东2,唐然2,冯裕钊2,周从直2,谢朝新2(1.后勤工程学院化学工程与技术博士后流动站,重庆401311;2.后勤工程学院营房管理与环境工程系,重庆401311):采用超声波法和阳离子交换树脂法分别提取好氧活性污泥(SRT分别为315d)絮体外层的胞外聚合物(LEPS)和内层的胞外聚合物(TEPS),并用LEPS和TEPS分别絮凝污泥悬浮液,探讨了EPS的种类及投量阳离子的价数与浓度对重新絮凝生物絮体沉降性能的影响结果表明,4种EPS絮凝污泥悬浮液所形成生物絮体的SVI值均随EPS投量的增加而增大,增幅由小到大排序为:15dTEPS3dTEPS15dLEPS3dLEPS;Al3+较Ca2+絮凝污泥悬浮液所形成生物絮体的Zeta电位低且结构密实,更能促进重新絮凝生物絮体的压缩沉降:胞外聚合物;阳离子;活性污泥:X703:C:1000-4602(2010)13-0050-04EffectofEPSandCationonSettleabilityofActivatedSludgeLONGXiangyu1,2,FANGZhendong2,TANGRan2,FENGYuzhao2,ZHOUCongzhi2,XIEZhaoxin2(1.PostdoctorMobileStationofChemicalEngineeringandTechnology,LogisticsEngineeringUniversityofPLA,Chongqing401311,China;2.DepartmentofBarracksManagementandEnvironmentalEngineering,LogisticsEngineeringUniversityofPLA,Chongqing401311,China)Abstract:LooselyboundEPS(LEPS)andtightlyboundEPS(TEPS)wereextractedbyultrasoundandcationexchangeresininturnfromaerobicsludgeflocwithSRTof3and15daysrespectively,andthesuspendedsludgeliquidwasreflocculatedbyLEPSandTEPS.TheeffectsofEPStypeanddosageaswellasthevalenceandconcentrationofcationonsettleabilityofreflocculatedbioflocwereinvestigated.TheresultsshowthattheSVIvalueofthebioflocreflocculatedbyfourtypesofEPSisincreasedwiththeincreaseofEPSdosage,andtheascendingorderofSVIvalueis15dTEPS,3dTEPS,15dLEPSand3dLEPS.TheZetapotentialofbioflocreflocculatedbyAl3+islowerthanthatbyCa2+,andthestructureoftheformerismorecompactthanthatofthelatter.Therefore,bycontrastwithCa2+,Al3+tendstopromotethesettlementofreflocculatedbiofloc.Keywords:extracellularpolymericsubstances(EPS);cation;activatedsludge:(2008ZX07315-003);(CSTC2009BB7175)(EPS)[12],,EPS[2~4],50第26卷第13期2010年7月中国给水排水CHINAWATER&WASTEWATERVo.l26No.13Ju.l2010[5~7][8](LEPS)(TEPS),LEPSTEPSLEPSTEPS,EPS,EPS1材料与方法11EBA21,TGL-16G,CY-5D,NanoZS90Zeta0017,12EPSSBR,SRT315d,,21kHz36W1minLEPS;LEPS2,TEPSEPS[89]13LEPSTEPS4,EPS:LEPSTEPS100mL,,200mL;160r/min0.5min,40r/min5min;30min,;,(60mL)6000r/min20min,,;SVI2试验结果21EPSEPS,[8]Ca2+120mg/L[(CaCO3)300mg/L]Ca2+Al3+806mg/L,EPS,11EPSFig.1EffectofEPSonsettleabilityofbiologicalflocs1,Ca2+120mg/L,EPS120mg/gVSS,15dTEPS3dTEPS15dLEPS3dLEPSSVI139mL/g155166195218mL/g;Ca2+Al3+,4EPSSVI97mL/g125136144171mL/g,4EPSSVIEPS,15dTEPS3dTEPS15dLEPS3dLEPS,4EPS,,EPS22K+Ca2+Al3+,,SVI,2,2(a)6mmol/L(K+Ca2+Al3+632mmol/L);2(b)9mmol/L(KClCaCl2AlCl3931.5mmol/L);EPS80mg/gVSS,51龙向宇,等:EPS与阳离子对活性污泥沉降性能的影响研究第26卷第13期2Fig.2Effectofcationtypesonsettleabilityofbiologicalflocs2,,Al3+SVICa2+K+,Al3+Ca2+K+SVI,33Fig.3Effectofcationconcentrationonsettleabilityofbiologicalflocs3,Ca2+15mg/L240mg/L,SVICa2+V;Ca2+120mg/L,15dLEPS,3EPSSVI[10]:0.005~0.025mol/L,,Ca2+120mg/L,0.009mol/L,[10]Al3+3mg/L54mg/L,Al3+SVIAl3+:AlCl3Al3+Cl-,Al3+54mg/L0.012mol/L,Al3+,,SVI;pH,Al3+Al(OH)+2Al(OH)2+Al7(OH)4+17Al13(OH)5+34,,Al3+Ca2+3分析与讨论31EPSLEPS,SVI;TEPSSVI,SVI[11]2.1LEPSTEPS[9],LEPS,LEPSTEPS,LEPSSVIEPSTEPS,LEPSTEPS,LEPS(62.710.3)(25.63.0)mg/gVSS,TEPS(102.35.1)(81.94.8)mg/gVSS,TEPS,TEPS3223,Al3+Ca2+52第26卷第13期中国给水排水[7],Ca2+60mg/L,4Zeta-15~-14mV;Al3+36mg/L,4Zeta-8~1mV,,4结论,,,SRT(15d),,SVI;,,,,LEPSTEPS(LEPS),,,,,,,,,SRT,,,,,,:[1]UrbainV,BlockJC,ManemJ.Bioflocculationinactivatedsludge:ananalyticapproach[J].WaterRes,1993,27(5):829-838.[2]LiaoBQ,AllenDG,DroppoIG,etal.Surfaceproperitiesofsludgeandtheirroleinbioflocculationandsettleability[J].WaterRes,2001,35(2):339-350.[3]ErikssonL,AlmB.Studyofflocculationmechanismsbyobservingeffectsofacomplexingagentonactivatedsludgeproperties[J].WaterSciTechno,l1991,24(7):21-28.[4],,.EPS[J].,2004,24(4):613-618.[5]BarkerDJ,StuckeyDC.Areviewofsolublemicrobialproduct(SMP)inwastewatertreatmentsystems[J].WaterRes,1999,33(14):3063-3082.[6]KeidingK,NielsenPH.Desorptionoforganicmacromoleculesfromactivatedsludge:Effectofioniccomposition[J].WaterRes,1997,31(7):1665-1672.[7]JinB,WilnBM,LantP.Acomprehensiveinsightintofloccharacteristicsandtheirimpactoncompressibilityandsettleabilityofactivatedsludge[J].ChemEngJ,2003,95(1-3):221-234.[8],,,.[J].,2008,24(15):1-6.[9],,,.[J].,2009,25(7):30-34,40.[10]LiaoBQ,AllenDG,LeppardGG,etal.Interparticleinteractionsaffectingthestabilityofsludgeflocs[J].JColloidInterfaceSc,i2002,249(2):372-380.[11],,.[J].,2008,21(3):15-20.:13108917086E-mail:[e-mail]:2010-01-1153龙向宇,等:EPS与阳离子对活性污泥沉降性能的影响研究第26卷第13期