过滤工艺中颤蚓的迁移分布规律

第32卷第5期土木建筑与环境工程Vol.32No.52010年10月JournalofCivil,Architectural&EnvironmentalEngineeringOct.2010聂小保1,2,黄廷林1,张金松3,张爽1,李伟1,李晓钰1(1.西安建筑科技大学环境与市政工程学院,西安710055;2.长沙理工大学水利学院,长沙410076;3.深圳水务集团,广东深圳518031):20100307:(2009ZX07423003);(IRT0853):(1979),,,,(Email)[e-mail]:中试条件下研究了颤蚓在过滤工艺中的迁移分布规律,并考察了滤速和过滤周期对颤蚓迁移分布的影响,以及反冲洗后滤池中颤蚓的分布情况结果表明:颤蚓在滤池中沿滤床深度方向的迁移与颤蚓体长和滤料粒径有关,颤蚓体长越小滤料粒径越大,则迁移幅度越大;滤速是颤蚓迁移的主要动力,滤速的提高会引起下层滤床中颤蚓数量的增加,颤蚓泄露风险加大;过滤周期的延长将促进颤蚓的迁移,适当缩短过滤周期有利于水厂颤蚓泄露风险控制;反冲洗可以实现颤蚓从净水工艺中的彻底去除,反冲洗强度越大,颤蚓的去除效果越好为有效控制颤蚓泄露风险,滤池滤速和过滤周期宜分别控制在9.4m/h和12h以下,反冲洗强度则控制在25L/sm2左右,此时颤蚓去除率为97.7%:颤蚓;滤池;迁移;分布:TU991.25;X174:A:16744764(2010)05008805MigrationandDistributionRulesofTubifexinFiltrationNIEXiaobao1,2,HUANGTinglin1,ZHANGJinsong3,ZhangShuang1,LIWei1,LIXiaoyu1(1.SchoolofEnvironmentalandMunicipalEngineering,XianUniversityofArchitecture&Technology,Xian710055,P.R.China;2.SchoolofWaterConservancy,ChangshaUniversityofScience&Technology,Changsha410076,P.R.China;3.ShenzhenWater(Group)Co.,Ltd.,Shenzhen518031,Guangdong,P.R.China)Abstract:Therulesofmigrationanddistributionregulationoftubifexinfiltrationwerestudiedinthepilotsystem.Meanwhile,theinfluencesoffiltrationrate,filtrationcycleandbackwashingonthewormsmigrationanddistributioninfiltraionwerediscussed.Theresultsshowedthatboththewormslengthandtheparticlesizeoffiltermediahadobviouseffectsonmigrationanddistribution:thesmallerthewormslengthandthelargertheparticlesizeoffiltermediawere,thestrongerthewormsmigrationcapacitywas.Thefiltrationratewasthemainmigrationpoweroftubifexinfiltration,whichmeanthighfiltrationratecouldresultinthewormsleakagerisk.Prolongingfiltrationcyclepromotedmigration,thusitisbeneficialtocontroltubifexleakageriskthatshorteningfiltrationcycle.Theremoveoftubifexinarealsensecanberealizedbybackwashing.Andthestrongerthebackwashingintensityis,thebettertheremovalefficiencyis.Basedontheexperimentalresults,tocontrolthewormsleakageriskeffectively,filtrationrateandcyclewouldbelowerthan9.4m/hand12h,respectively.Backwashingintensitywouldbecontrolledabout25L/sm2,atwhichtheobtainedtubifexremovalefficiencywas97.7%.Keywords:tubifex;filtration;migration;distribution1,,,[12][3],,,,[45][6]360,[7],BAC150d,,200ind./m3Mauclaire[8],,200ind.50ind.[9],,,,10~4000[10],,,BAC,,BAC,BAC,BAC,[11],,BAC,BAC,,,,,11.1100~150L/h,!∀,1,2,,90mm700mm:dmin=0.95mmdmax=1.35mmk801.5;:dmin=2.36mmdmax=3.35mmk801.52,4~8mm100mm,10~12mm50mm11.2,500mm,200mm,,100mm,,80mm,6~8mgL-1,pH6.51,,,,,NaHSO3,100mg/L,,30~40NTU1.3300,,5cm1,,,,,,22.12cm4cm89第5期聂小保,等:过滤工艺中颤蚓的迁移分布规律(),8m/h,12h,23232,,,,25~30cm20~25cm,3522,12,45cm,(70%)0~5cm,[1213],[14]LWW=aLb,a,bLazim[15]W8D8th:lg(W-0.005)=3.5875lgD8th-0.02434(1)Lh8D8th:lg(aLb-0.005)=3.5875lgD8th-0.02434(2)(2),,8D8th,,2,[6],,7~8cm2.5~3cm1~1.5cm1000%60%100%(3),,,,,,,,23,20cm,,2.27.8m/h9.4m/h11.1m/h12.6m/h,12h,44,,,7.8m/h9.4m/h,,;11.1m/h20~40cm,,;12.6m/h,(35cm)(35cm)Merle[16]0~30cm,Tetsuya[17],,1mMerle[16],,(0.6~2mm)70cm,,,12.6m/h,,,,,,,,9.4m/h2.39m/h,90土木建筑与环境工程第32卷5(8h),40%0~5cm12h,0~5cm,13%,5cm8h,18h,0~5cm,12h,,18h128,12h58,,,,5,12h452.4,12h,9m/h,,10min,15L/sm220L/sm225L/sm26,0~5cm,5cm,,,15L/sm220L/sm225L/sm2,139287,,,,,,,[18]6,25L/sm2,97.7%,12~15L/sm2[19],,[7]BAC,,,,,631),;,2),,,;,,3),,,25L/sm2,97.7%91第5期聂小保,等:过滤工艺中颤蚓的迁移分布规律:[1]MOSLEHYY,PARISPALACIOSS,BIAGIANTIRISBOURYS.MetallothioneinsinductionandantioxidativeresponseinaquaticwormsTubifextubifex(Oligochaeta,Tubificidae)exposedtocopper[J].Chemosphere,2006,64(1):121128.[2]MERMILLODBLONDINF,NOGAROG,GIBERTJ.Laboratorystudyhighlightsthekeyinfluencesofstormwatersedimentthicknessandbioturbationbytubificidwormsondynamicsofnutrientsandpollutantsinstormwaterretentionsystems[J].Chemosphere,2008,72(2):213223.[3]MOSLEHYY,PARISPALACIOSS,AHMEDMT,etal.EffectsofchitosanonoxidativestressandmetallothioneinsinaquaticwormTubifextubifex(Oligochaeta,Tubificidae)[J].Chemosphere,2007,67(1):167175.[4].[M].:,2006.669722.[5],,.[J].:,2006,38(2):263268.HUANGTL,WUHX,CHENQJ.Experimentalstudyonkillingtubifexindrinkingwater[J].JofXianUniversityofArchitecture&Technology:NaturalScienceEdition,2006,38(2):263268.[6],,,.[J].,2005,31(6):3840.CHENX,ZHUL,WANGQS,etal.Pilotstudyongrowthandreproductionofredworm[J].Water&WastewaterEngineering,2005,31(6):3840.[7].[D].:,2007.[8]MANCLAIREL,SCHURMANNA,MERMILLODBLONDINF.Influenceofhydraulicconductivityoncommunitiesofmicroorganismsandinvertebratesinporousmedia:acasestudyindrinkingwaterslowsandfilters[J].Aquat.Sci,2006,68(1):100108.[9]VANLIEVERLOOJHM,BOSBOOMDW,BAKKERGL,etal.Samplingandquantifyinginvertebratesformdrinkingwaterdistributionmains[J].WaterRes,2004,38(3):11011112.[10]WOLMARANSE,DUPREEZHH,DEWETCME,etal.Significanceofbacteriaassociatedwithinvertebratesindrinkingwaterdistributionnetworks[J].WaterScience&Technology,2005,52(8):171175.[11],,,.[J].,2010,31(2):331337.HUANGTL,NIEXB,ZHANGJS,etal.RapidinactivationmechanismofcoppertoTubifextubifexanditsapplicationanalysisinwaterplant[J].EnvironmentalScience,2010,31(2):331337.[12]FIGUEIREDOBARROSMP,LEALJJF,ESTERESFDA,etal.Lifecycle,secondaryproductionandnutrientstockinHeleobiaaustralis