A2O工艺的污泥膨胀及污泥特性研究

A2/O吴昌永1,彭永臻1,2,王淑莹2,刘洋3,彭轶1,李晓玲1(1.哈尔滨工业大学城市水资源与水环境国家重点实验室,黑龙江哈尔滨150090;2.北京工业大学北京市水质科学与水环境恢复工程重点实验室,北京100022;3.中国水务控股有限公司新加坡,北京100022):丝状菌污泥膨胀是制约活性污泥工艺发展的重大难题之一,在同步脱氮除磷系统中更容易发生以城市污水厂中最常采用的A2/O同步脱氮除磷工艺为研究对象,系统探讨了该工艺中可能出现的丝状菌污泥膨胀及其诱因,并研究了膨胀污泥的特性结果表明,若运行不当,A2/O工艺也可能发生丝状菌污泥膨胀;单纯提高好氧区的DO浓度可在一定程度上改善污泥的沉淀特性,而增大好氧区的有机负荷对控制污泥膨胀更为重要沉淀性能良好的污泥粒径分布范围较广,在15m和50m附近也有部分分布,且大多为球菌;膨胀污泥的粒径大多在10m以下,绝大多数为丝状菌,只有少量球菌被包埋在丝状菌内部:A2/O工艺;污泥膨胀;粒径分布:X703.1:A:1000-4602(2008)23-0033-04:(863)(2006AA06Z319);(50778005);(EDBS07/1-53974092)StudyonActivatedSludgeBulkingandSludgeCharacteristicsinA2/OProcessWUChangyong1,PENGYongzhen1,2,WANGShuying2,LIUYang3,PENGYi1,LIXiaoling1(1.StateKeyLaboratoryofUrbanWaterResourceandEnvironment,HarbinInstituteofTechnology,Harbin150090,China;2.KeyLaboratoryofBeijingforWaterQualityScienceandWaterEnvironmentRecoveryEngineering,BeijingUniversityofTechnology,Beijing100022,China;3.ChinaWaterHoldingPte.Ltd.,Beijing100022,China)Abstract:Filamentoussludgebulking,whichoccursmorefrequentlyinbiologicalnutrientsremoval(BNR)systems,isasevereproblemrestrictingthedevelopmentofactivatedsludgeprocess.TakingtheA2/OprocesscurrentlyusedinWWTPasresearchobjec,tthefilamentoussludgebulkinganditsinducementlikelyoccurredinthisprocesswereinvestigated,andthecharacteristicsofbulkingsludgewerestudied.TheresultsshowthatthefilamentoussludgebulkingmayoccurintheA2/Oprocessiftheoperationisunsuitable.TheincreasingofDOconcentrationintheaerobiczonecanimprovesludgesettleabilitytoacertainexten,tandtheincreasingoftheorganicloadingrateintheaerobiczoneismoreimportantforcontrolofsludgebulking.Thesludgewithgoodsettleabilityhaswideparticlesizedistribution,ispartlyabout15mand50m,andthemajorityofbacteriaarecocc.iTheparticlesizeofbulking33第24卷第23期2008年12月中国给水排水CHINAWATER&WASTEWATERVo.l24No.23Dec.2008sludgeismainlylessthan10m,themajorityofbacteriaarefilamentousbacteria,andtheminorityofcocciareembeddedinsidefilamentousbacteria.Keywords:A2/Oprocess;sludgebulking;particlesizedistribution,50%[1]95%[2],,,,,[34][5],,A2/O,,A2/O,1试验材料与方法11A2/O11A2/OFig.1SchematicdiagramofA2/Oprocess,52.5L,9,2,2,5112,21~22!26L:157.5L/d,HRT8h,SRT15d,MLSS3500mg/L,70%,250%12,COD,NaHCO3NaOHpH:3~3.6mL/L,0.1~0.2g/L,KH2PO40.04~0.05g/L,NaHCO30.2~0.3g/L,NaOH0.15g/L,MgSO47H2O0.06g/L,CaCl22H2O0.015g/L,1mL/L([6])11Tab.1CharacteristicsofsyntheticwastewaterpHCOD/(mgL-1)NH+4-N/(mgL-1)TN/(mgL-1)PO3-4-P/(mgL-1)(CaCO3)/(mgL-1)6.63~7.47142.9~499.323.77~53.1223.94~54.585.34~15.78210~2307.01353.340.0340.7610.26223.313,CODNH+4-NNO-3-NNO-2-NTNPO3-4-PMLSS;ORPWTW-InoLablevel2;pHDOWTW-340i;;HIACRoyco97032结果与分析21A2/O,A2/O,75dSVIMLSS2,∀30d,,SVI265.8mL/g,,0.2m3/h,DO1.08mg/L;#,,0.3m3/h,DO2.16mg/L,1734第24卷第23期中国给水排水∃,,15%,#,,,SVI100mL/g,2SVIMLSSFig.2ChangesofSVIandMLSSduringsteadyoperation,A2/O,,,#,DOBNR,,22,,,33Fig.3Granulesizedistributionbeforeandaftersludgebulking3,10m,,,15m50m;,,,10m23,44Fig.4SEMmicrographofsludgebeforeandaftersludgebulking4,,,;,,,3结论%A2/O,,&DO,A2/O∋,;10m,,,:[1]KristensenGH,JorgensenPE,NielsenPH.SettlingcharacteristicsofactivatedsludgeinDanishtreatmentplantswithbiologicalnutrientsremoval[J].WaterSciTechno,l1994,29(7):157-165.[2],,.[J].,2006,7(5):1-9.(下转第39页)35吴昌永,等:A2/O工艺的污泥膨胀及污泥特性研究第24卷第23期6,HRTNH+4-N,HRTNH+4-NHRT4812h53.46%86.52%92.30%,,26HRTTNHRTTN77HRTMIBRTNFig.7TNremovaleffectofIMBRunderdifferentHRT7,TNHRTNH+4-N,HRTTNHRT4812h,TN46.59%64.16%74.45%3结论%2h2h,C/N345,IMBR,CODTNNH+4-NGB18918(2002A,CODTNC/NC/N5,COD82.19%,TN78.00%C/N&HRT4812h,IMBRCOD52.80%83.18%70.00%HRT8h,HRT,COD,TNHRT,HRT12h92.30%,TN74.45%:[1],.[J].,2000,26(1):6-10.[2],,,.[J].,2005,6(11):46-50.[3].[J].,1999,25(2):11-13.[4].(4)[M].:,2002.[5],,,.[J].,2008,24(13):27-30.:(1972-),,,,,:[phone]E-mail:[e-mail]::2008-07-31(上接第35页)[3]MartinsAMP,PagillaK,HeijnenJJ,etal.Filamentousbulkingsludge-acriticalreview[J].WaterRes,2004,38(4):793-817.[4]AntonioMartinsMP,HeijnenJJ,vanLoosdrechtMCM.Bulkingsludgeinbiologicalnutrientremovalsystems[J].BiotechnolBioeng,2004,86(2):125-135.[5]KrhutkovaO,RuzickovaI,WannerJ.MicrobialevaluationofactivatedsludgeandfilamentouspopulationateightCzechnutrientremovalactivatedsludgeplantsduringyear2000[J].WaterSciTechno,l2002,46(1-2):471-478.[6]SaitoT,BrdjanovicD,vanLoosdrechtMCM.Effectofnitriteonphosphateuptakebyphosphateaccumulatingorganisms[J].WaterRes,2004,38(17):3760-3768.:(1980-),,,,:13214605201E-mail:[e-mail]::2008-07-2539陆谢娟,等:一体化IMBR处理低碳城市污水的脱氮研究第24卷第23期