表面活性剂对活性污泥脱水性能和机理的研究

2010年5月May2010华南师范大学学报(自然科学版)JOURNALOFSOUTHCHINANORMALUNIVERSITY(NATURALSCIENCEEDITION)2010年第2期No.2,2010:2009-09-08:(1986),,,2007,Emai:[e-mail];(1955),,,,:,Emai:[e-mail].*:1000-5463(2010)02-0076-06CTAC李恺,叶志平*,李焕文,王凤英(,510631):通过对污泥含水率和胞外聚合物(EPS)含量的测定,考察了阳离子表面活性剂(CTAC)和阳离子聚丙烯酰胺(CPAM)对污泥脱水性能的影响.结果表明,它们都有助于改善污泥的脱水性能,CPAM的最佳投药量为00106g/100mL污泥,表面活性剂投药量约为0738g/100mL污泥,分别使污泥滤饼含水率降至8028%和6873%.为了进一步探讨表面活性剂对污泥的作用机理,实验通过观察表面活性剂处理前后污泥的电镜扫描照片(SEM)和粒径分布,发现经过表面活性剂处理的污泥原絮团被破坏,污泥表面呈网状结构;占体积分数90%的颗粒粒径都在52m以下,较原泥明显减小.实验表明,表面活性剂主要是通过破坏污泥结构释放内部结合水和溶出EPS来改善污泥脱水性能.:表面活性剂;剩余污泥;脱水性能:X705:A,,,.,,,[1-4].80%,,,.,[5-6].,().,(CPAM),.11.1,24h.98%~99%,pH=68.,4~5d.:(CTAC),1272g/L;(CPAM),1.0g/L;.:D-2001T6;KYKY-1000B;101A-3;722S;XZ-1;.1.2(1)滤饼含水率的测定100mL,008MPa15min,,1056~8h,,[7]:a=W2-W3W2-W1!100%,(1)(1)a(%);W1(g);W2+(g);W3+(g).(2)污泥比阻的测定(SRF),1.,,,.109~1010s2/g,(05~09)!109s2/g,04!109s2/g.,(008MPa),,15s1,10min.,,.tV,b,∀C,SRF[8],SRF=2pF2#bC=KbC,(2)(2)(SRF)s2/g(cm/g);P(g/cm2);(g#cm-1#s-1);F(cm2).C=1(100Ci-1)-(100Cf-1),(3)(3)Ci100g;Cf100g.1Fig.1MeasuringdeviceofSRF:1:;2:;3:;4:;5:;6:(3)污泥沉降实验100mL,,1min5min,100mL,,1h.,.(4)胞外聚合物(EPS)分析100mL,,,;-,.(5)污泥微观结构观察,,.22.1,23100mLCPAM1h.,.23CPAM0738g0015g,,CPAM.:CPAM,,;,,2Fig.2Effectofsurfactantonthevolumeofsludgesettlement3CPAMFig3EffectofCPAMonthevolumeofsludgesettlement77第2期李恺等:表面活性剂CTAC对活性污泥的脱水性能及其机理研究(EPS),,[6].2.2CPAM,7900%~8000%,4CPAM8028%,,.4CPAMFig.4EffectofCPAMonthemoisturecontentofsludgefiltercake4,100mLCPAM0015g,,,,CPAM,,[9-10].(SRF),5,.CPAM,557!109s2/g,29!108s2/g.6.100mL0~0738g,,8836%6873%,,CPAM.0942g,6890%.7,10!108s2/g,(:,,,,)5CPAMFig.5EffectofCPAMonSRF6Fig.6EffectofCTAConthemoisturecontentofsludgefiltercake7Fig.7EffectofCTAConSRF2.3(EPS)(EPS),.,,.EPS,78华南师范大学学报(自然科学版)2010年,,EPS[11].EPS70%~80%,EPS.,EPS,,,;EPS,,,[5].8,CPAM,7745712523mg/mL.CPAM.8EPSFig.8ContentofproteinandpolysaccharideintheEPS2.4(SEM)9~11.SEM:,,;CPAM.,.1,,,5200m,CPAM23980m,14712m..,,EPS,,CPAM.9(!1500)Fig.9Theoriginalsludge(!1500)10(!1500)Fig.10Thesludgeaddedwithsurfactant(!1500)11CPAM(!1500)Fig.11ThesludgeaddedwithCPAM(!1500)79第2期李恺等:表面活性剂CTAC对活性污泥的脱水性能及其机理研究1mTab.1Particlesizedistributionstatisticsforthesludgewithandwithouttreatmentd10d20d30d40d50d60d70d80d9015.4122.7332.4939.8049.5659.3286.15120.29147.12CPAM12.9820.2927.6132.4939.8061.76156.90193.50239.8010.5417.8520.2925.1727.6132.4937.3744.6852.00:d1010%()3(1)CPAM,0738g/100mL,8836%68.73%,CPAM.(2):,90%52m;CPAM,,.(3)(EPS).,EPS,.EPS,.:[1],,./[J].,2007,26(1):42-45.LIUBingtao,LOUYuanzh,iXUFe.iEffectofpolymericaluminumchloride/chitosancompositeflocculantonactivatedsludge[J].EnvironmentalChemistry,2007,26(1):42-45.[2],,,.[J].,2004,23(3):27-29.LIUQianjun,ZHANHuaiyu,LIUMinghua,eta.lTheperformanceofanamphotericligninflocculantonmicrobialsludgedewatering[J].PaperScienceandTechnology,2004,23(3):27-29.[3],,,.[J].,2007,23(9):24-27.YANGAming,ZHANGZhiqiang,WANGXuejiang,eta.lStudyonhigh-efficiencymicrobialflocculantforsludgedewateringanditsdynamics[J].ChinaWaterandWastewater,2007,23(9):24-27.[4],,.[J].,2005,25(5):35-37.ZOUPeng,SONGBiyu,WANGQiong.Dosageofchitosanflocculantinfluencingonsludgedewateringperformance[J].IndustrialWaterTreatment,2005,25(5):35-37.[5],,,.[J].,2000,21(5):97-100.CHENYinguang,YANGHaizhen,WUGuibiao,eta.lSurfactantimprovingactivatedsludgedewaterabilityanditsmechanism[J].EnvironmentalScience,2000,21(5):97-100.[6],,,.[J].,2008,27(4):444-448.LUWen,ZHANGDengfeng,HUKailin,eta.lEffectandmechanismofcationicsurfactantsonsludgedewaterability[J].EnvironmentalChemistry,2008,27(4):444-448.[7],,.[J].,2007,26(4):537-541.ZHUShuhu,iXUHonglin,HANPingfang.Sludgedewateringbyultrasoundandcompositeflocculantsandmechanismanalysis[J].ChemicalIndustryandEngineeringProgress,2007,26(4):537-541.[8].[M].:,1989:113-117.[9],,.PDA[J].,2002(2):205-210.ZHANGYuejun,GUXuefang,CHENWeizhong.Synthesisandapplicationofcationicflocculantpda:Studyonsludgedewateringinprocessingmunicipalsewage[J].JournalofNanjingUniversityofScienceandTechnology,2002(2):205-210.[10],,.[J].,2005,31(4):18-20.CHENXiaoming,SUNPeng,LINMan.Improvingthedewateringperformanceofsludgebyflocculants[J].En80华南师范大学学报(自然科学版)2010年vironmentalProtectionScience,2005,31(4):18-20.[11]FORSTERCF.Activatedsludgesurfacesinrelationtothesludgevolumeindex[J].WaterResearch,1971,5:861-870.STUDYOFSURFACTANTSCTACONACTIVATEDSLUDGSDEWATERABILITYANDMECHANISMLIKa,iYEZhiping*,LIHuanwen,WANGFengying(SchoolofChemistryandEnvironment,SouthofChinaNormalUniversity,Guangzhou510631,China)Abstract:Effectsofcationicsurfactant(CTAC)andcationicpolyacrylamide(CPAM)onsludgedehydrationabilitywerestudiedbytestingthemoisturecontentandextracellularpolymericsubstance(EPS)ofsludge.ExperimentalresultsindicatethatthedehydrationabilityofsludgetreatedwithCTACorCPAMisimproved.TheoptimumdosagesofCPAMandCTACare0.0106gramto100mlsludgeand0.738gramto100mlsludgerespectively,whichmakethemoisturecontentoffilteredsludgedownto80.28%and68.73%respectively.InordertoexploretheactionmechanismofCTAConsludge,scanningelectronicmicroscope(SEM)andsizedistributionweremadetothesludgebef