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吴 磊,吕锡武,李先宁,刘 晋,宋海亮(东南大学环境科学与工程系,南京210096) :、、、,--,。;1:1,45/m2,;0.5m;5cm,;,,2.4h。:;;;;:X703.1 :A :1671-1556(2007)03-0033-04①StudyontheDesignofWaterfallAerationContactOxidationforRuralSewageTreatmentWULei,LUXi-wu,LIXian-ning,LIUJin,SONGHai-liang(DepartmentofEnvironmentalScienceandEngineering,SoutheastUniversity,Nanjing210096,China)Abstract:Inordertomeetthetechnicalrequirementsofsmalleroccupancyarea,higherefficiencyofnitro-genandphosphorusremoval,easiermaintenanceandloweroperationandconstructioncostinthetreat-mentofruralsewageinLakeTaihuvalley,afull-scaleexperimentontheuseofthecombinedprocessofanaerobic/waterfallaerationcontactoxidation/constructedwetlandwascarriedout.Thedesignandopera-tionparametersforwaterfallaerationcontactoxidationweremainlyinvestigated.Theoxygensupplyabili-tyofwaterfallaerationcanmeetthedemandofmicroorganismmassandpollutantremovalwhentheelasticpackingandassortedpackingarearrangedintheratioof1:1andtheplanedensityis45trailspersquaremeterincontactoxidationtank.Thecost-effectiveheightofwaterdroppingbetweentwoneighborsis0.5m.Thedroppingbafflewithlongitudinalslotof5cmspacingdispersesthewaterfallbettersoastobenefittheaeration.Whenthehydraulicretentiontime(HRT)descends,theaerationisstrengthened;however,theloadingrateofpollutantsisenhancedandresultsinthedeclineofremovalefficiency.SothepreferableHRTisabout2.4h.Keywords:waterfallaeration;ruralsewage;droppingbaffle;packing;hydraulicretentiontime0 ,,、,、,。“-14 32007 9 安全与环境工程SafetyandEnvironmentalEngineering Vol.14 No.3Sep. 2007①:2007-03-06 :2007-04-13:(863)(2002AA601012-1A)、(50678035)。: (1969—),,,,。E-mail:wulei@seu.edu.cn-”[1],。———,,,,,,。1 1.1 ,1。1 Fig.1 Schematicdiagramofcombinedprocess,20m3,2~4d。4m,。5,()40cm,2h。50cm,。,。,,,,。20cm,2。,。,50cm/d,1.5m×7m,0.5%,0.75m。,。40cm、30cm、5cm,、。。。1.2 ,2 Fig.2 Schematicdiagramofsinglewaterfallaerationcontactoxidationtank。78,、,5~10m3/d,1。1 (mg/L)Table1 InfluentwastewaterqualityofexperimentprojectCODTNTP49430506.0811.03.00.7287.515.526.53.351.3 20045,6。6,,。1.4 DO、pH、COD、NH+4-N、TN、TP,[2]。2 2.1 、、、[3],,。、,,。,,,。,,。2NH+4-N。2,,NH+4-N41%34 安全与环境工程 第14卷82%,,。,45/m259/m2,69%。,,,,,,,1∶1,45/m2。2 NH+4-NTable2 InfluenceofpackingpartnershipandfillingdensityonNH+4-Nremovalefficiency/(·m-2)/(mg·L-1)/(mg·L-1)/%3024.714.641(1∶1)4526.34.782(1∶1)5926.98.469 :NH+4-N3。2.2 ,,,,,。。“(Fick)”“”[4],()dCdt=KLa(Cs-C)(1):dCdt(kgO2/(m3·h));KLa;Cs(mg/L);C(mg/L)。(1)C=Cs-e-KLat(Cs-C0)(2):C0(mg/L)。,t=2gH(3)(3)(2)C=Cs-e-KLa2gH(Cs-C0)(4)KLa、。(3),KLa、CsC0,。KLa,,3。3 Table3 Changesindissolvedoxygenbeforeandafterdrop-pingatdifferentheights/mDO/(mg·L-1)DO/(mg·L-1)DO/(mg·L-1)0.3 1.60.60.51.01.90.90.8 2.11.13,0.3m0.5m,0.2m,DO0.3mg/L;0.5m0.8m,0.3m,DO0.2mg/L。,,,,。0.5m。2.3(4),,KLa。KLa、。,、。[5],,。。,KLa。,,,。4,:(1)5cm———,3mm,5cm;(2)2.5cm———,3mm,2.5cm;(3)10mm———,5mm,10mm;(4)5mm———,5mm,5mm。3,5cm2.5cmDO2.4mg/L2.2mg/L,5mm10mmDO35第3期 吴 磊等:处理农村污水的跌水充氧接触氧化技术设计研究 3 Fig.3 Influenceofthetypeofdroppingbaffleonaera-tingability1.0mg/L0.8mg/L,DO。,,,,,;,,,,。5cm2.5cm,2.5cm,,。,5cm。2.4,(HRT)。,HRT;,HRT,,;,。,HRT。3CODNH+4-N,4。4,HRT3.33h2.41h,CODNH+4-N10%,HRT2.06h,COD18%,NH+4-N63%。,。HRT,,,,,COD。4 Fig.4 InfluenceofHRTonremovaleffect,HRT,,,,NH+4-N。,HRT,CODNH+4-N,HRT,。,HRT2.4h。3 (1)1∶1,45/m2,。(2),0.5m。(3),,5cm。(4)HRT,CODNH+4-N,HRT,。HRT2.4h。:[1],,,.//[J].,2007,23(3):57-59.[2].(4)[M].:,2003.[3],,,.NH+4-N[J].,2001,22(3):40-43.[4],,.()(4)[M].:,2000.[5],.(2)[M].:,2000.36 安全与环境工程 第14卷
本文标题:处理农村污水的跌水充氧接触氧化技术设计研究吴磊
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