MBR中低pH值与低有机负荷引起的污泥膨胀及其恢复李亚峰

　　:2007-05-10:(05-K2-9);(HJ-200605):(1960—),,,,.:1671-2021(2007)06-0994-05MBRpH李亚峰,金亚斌,陈　涛,孟繁丽,高　可(,110168)　:研究低pH值、低有机负荷引起的丝状菌活性污泥膨胀对MBR工艺运行效果的影响,控制污泥膨胀,为实际工程应用提供实验依据.试验以增加反应器内的碱度和污泥负荷来提供适应菌胶团生长的微生物环境为主,同时投加次氯酸钠杀菌剂和硫酸亚铁絮凝剂来辅助控制污泥膨胀.污泥膨胀期间,上清液CODcr平均去除率比未发生污泥膨胀时提高了6.31%;为保持恒定出水量,膜两侧压差在7d内由10kPa迅速增加到65kPa.控制反应器内pH值7.2～8.0,BOD污泥负荷在0.292～0.323,调整十余天后,成功控制住了污泥膨胀.丝状菌比表面积大,在低底物浓度的条件下对基质的亲和能力比菌胶团强,污泥膨胀使膜污染急剧增加.创造有利于菌胶团生长的微生物环境可有效地恢复由丝状菌引起污泥膨胀.:;;;:X703　　　:A　　　　　(MembraneBioreactor,MBR),,,[1],.,,.,,.95%,、,,、、,,MBR[2-4].5:(1);(2);(3);(4)、pH;(5)[5]..pH,,,.1　1.1　(1).120L,,(PVDF),0.2μm,0.6μm,1.0μm,1m2,0.24m3/d.,;.200711236　()JournalofShenyangJianzhuUniversity(NaturalScience)　Nov.　2007Vol.23,No.61.　2.　3.　4.5.　6.　7.　8.9.　10.1　1.2　,、、,:、、、、.1.:CODcr,BOD5,NH3-N,MLSS,pH,TP,.1.3　,,,.,3d.、、,1　ρ(CODcr)/(mg·L-1)ρ(BOD5)/(mg·L-1)ρ(NH3-N)/(mg·L-1)ρ(SS)/(mg·L-1)t/℃pHρ(TP)/(mg·L-1)127～62573.5～348.714.5～69.220～13012～16.34.5～8.02.5～14.1(HRT)8h,40∶1,(DO)2.0mg/L,10L/h,(MLSS)3.5g/L.7d,,,,,.2　2.1　17d,3d(SV)86%,92%,94%;(SVI).,,.,,,(2).2.2　3.,,200611.CODcr,4d33mg/L.,2　3　COD23:MBRpH995　　,,CODcr.7d,,,7～16dCODcr26.13～43.31mg/L,87.56%,CODcr12.24～16.45mg/L,93.8%.CODcr,.,CODcr,.,CODcr17.45～25.31mg/L,93.87%,CODcr9.45～13.74mg/L,94.12%～97.03%.MBR,[3].,MBR,CODcr,,,.2.3　,、、[6],,,.,(4).17～23d,10kPa65kPa.24d,8d76kPa.4　　　,CODcr,,.MBR,,.,,.3　3.1　,,,SVI,271mL/g.pH4.5～5.7.pH,pH,,,、,pH[7].BOD0.042～0.072,pH、.,,,,.SVI.:,,(、)H2S,pH;,.,CODcr、pH,,.pH[8-10].3.2　SBR,pH、pH[7].BOD0.292～0.323.,,pH7.2～8.0.,996　　()2310d,,.5.5　　　,32～40dSVI271mL/g180mL/g.,40d60mg/L.,pH,、,.4～5dSVI100mL/g.,,,,(6).6　　　,,,7,15d,10kPa15.3kPa,,(7).7　4　　(1),,.(2)pH,pH;pH,.pH7.2～8.0.(3)CODcr,,.、,.(4)pH,.:[1]　,,,.[J].,2004,20(12):33-36.[2]　NovakL,LarreaL,WannerJ,etal.Non-filamen-tousactivatedsludgebulkinginalaboratoryscalesys-tem[J].WaterResearch,1993,27(8):1339-1346.[3]　,,.[J].,2003(7):79-83.23:MBRpH997　　[4]　,,,.、CAST[J].,2006,22(5):795-797.[5]　,,,.[J].,2006(3):44-46.[6]　,.[J].,2004,24(2):247-251.[7]　,,,.pH[J].,2000,33(2):53-57.[8]　MamaisD,AndreadakisA.Causeofandcontrolstrategiesformicrothrixparvicellabulkingandfoam-inginnutrientremovalactivatedsludgesystems[J].Wat.Sci.Teeh,1998,37(4/5):9-17.[9]　CowanrobertM,LovenancygG.Activatedsludgemadeotheraerobicsuspendedcultureprocesses[J].WatEnvironRes,1995,67(4):433-450.[10]　KnoopS,KunstS.Influenceoftemperatureandsludgeloadingonactivatedsludgesetting,especiallyonmicrothrixparvicella[J].WatSei.Tech,1998,37(4/5):27-35.SludgeBulkingandItsRecoveryCausedbyLowpHValueandLowOrganicLoadinginMBRLIYafeng,JINYabin,CHENTao,MENGFanli,GAOKe(SchoolofMunicipalandEnvironmentalEngineering,ShenyangJianzhuUniversity,ShenyangChina,110168)Abstract:ExperimentwasmadetoinvestigatetheinfluenceofsludgebulkingoffilamentousmicrobecausedbylowpHvalueandloworganicloadingontheoperationofMBR.Wecontrolledsludgebulkingandofferedexperimentaldatatothepracticalproject.Mainlyincreasingalkalinityandsludgeloadinginthereactorformicrobialconditionwherezoogloeagreweasily,weaddedJavelwaterandferroussulfateonside,andsludgebulkingwaswellundercontrol.TheresultshowsthattherewasanincreaseoftheremovalrateofCODintheprocessofsludgebulking,whichroseby6.31%comparedwithnosludgebulkinghappeningintheup-perliquid.Inordertomaintaintheoutwatervolume,thehighernetwater-headdifferentialpressureschangedfrom10MPato65MPawithin7d.WithpHvaluerangingfrom7.2to8.0inreactor,sludgeload-ingchangedbetween0.292and0.323kgBOD/(kgMLSS·d).Aftermorethantendays,sludgebulkingwassuccessfullykeptundercontrol.Sludgebulkinggotmembranepollutedinanincreasingrate.Therefore,itcreatedafavorableenvironmentforthegrowthofzoogloeaandmadetherecoveryofsludgebulkingoffila-mentousmicrobeeasily.Keywords:membranebio-reactor;membranefouling;sludgebulking;sludgeloading998　　()23