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SWIT
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eCHongqIng: deSIgnaTIon and ProSPeCT of CHengdu medICalCollege greyWaTer demoCHengdu demo-ProjeCT
3rd SCIenTIfIC meeTIngbelo HorIZonTe braZIldeCember 2008
baCkground
InTroduCTIon of CmC neW CamPuS
• ChengduMedicalCollege(CMC)wasfoundedin1947andwasdetachedinAugust,2004fromtheThirdMilitaryMedicalUniversityasanindependentundergraduatecollege.CMCexpropriatesnewlandinXindudistrictfornewcampustoimprovethecollegeconstruction.XinduisasatellitetownofChengduCity,about25kmtothecenterofChengdu.
* Thenewcampuswillbeconstructedintwoperiods.Thefirstphasewilloccupy437487.2m2(whichincludes70400.3m2forotheruseand367086.8m2isavailableforconstruction),andthesecondphasewilloccupy293183.1m2(whichincludes46933.6m2forotheruseand246249.6m2isavailableforconstruction).
• Designscaleofnewcampusis:13,000students,73.66703hm2oftotaloccupiedarea(whichincludes11.73339hm2forotheruseand61.93364hm2isavailableforconstruction),and380,700m2oftotalbuildingarea.
ClImaTIC CondITIonS
CMCnewcampuswilllocateinsubtropicalzonewithmonsoonclimate.Meansannualtemperatureis16.2°C,extrememaximumannualtemperatureis37.3°C,extrememinimumannualtemperatureis-5.9°C,morethan337daysofoneyearisfrostlessday,andmeantemperatureofthecoldestmouth(January)is5.6°C.Ithasabundantrainfall,andthemeanannualprecipitationis828.4mm,mostofwhichfallingbetweenJulytoAugust.DecemberandJanuaryhaslowestrainfallinwholeyear.Themeanannualevaporationis1021.3mm.Table1liststhemeteorologicalelementsofCMCnewcampus.
Fig.1ThesitelocationofCMCNewCampus
Fig.3TheConstructionPhaseDistributionofCMCNewCampus
Fig.4TheFunctionDistributionofCMCNewCampus
Fig.2TheMasterPlanofCMCNewCampus
Table1AStatisticalofCMCNewCampusPrecipitationandEvaporation(meanvalueof1970~2005)Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
precipitation(mm) 7.8 12.6 19.9 42.1 69.9 101.3 216.0 192.5 110.5 33.4 17.3 5.1
evaporation(mm) 30.1 36.8 65.8 105.4 149.8 138.1 132.8 133.6 92.3 63.8 44.0 28.8
Fig.5Theprocedureofthewholesystem
deSIgned WaTer qualITy
grey WaTerTable2theDesignedGreyWaterQualityParameterParameters COD BOD SS TN TPWaterquality(mg/L) 100 60 80 10 15
raInWaTerTable3theDesignedRainWaterQualityParameterNo. Water-qualityindex/unit Roof
rainwaterGroundrainwater
1 Turbidity/NTU 20~200 20~2002 SuspendedsolidSS 50~150 80~5003 colourity 20 405 PH 5.8~7.0 5.8~7.06 CODCr/mg.L-1 20~150 50~3007 NH3-N/mg.L-1 2.5~15 3.0~408 freeresidualchlorine/mg.L-1 0 09 Thetotalnumberofbacilluscoli(n/L) 0 10
reClaImed WaTerTable4RecycledWaterQualityStandardsandDesignValues
No. Items(mg/L) ToiletFlushing
Roadcleaning,firefighting
UrbanPlanting Landscaping Designed
values
1 Basicrequirements —— Nofloatingobjects
Nofloatingobjects
2 pH ≤ 6.0~9.0 6~93 color(chroma) ≤ 30 304 smell Nooffensiveodor5 SS ≤ —— 10 106 turbidity(NTU) ≤ 5 10 10 —— 107 Solubletotalsolid ≤ 1500 1500 1000 —— 10008 BOD5 ≤ 10 15 20 6 109 Totalphosphor ≤ —— 0.5 0.510 Totalnitrogen ≤ —— 15 1511 Nitrogen,ammonia(basedonN) ≤ 10 10 20 5 512 anionsurfaceactiveagent ≤ 1.0 1.0 1.0 0.5 0.513 petroleum ≤ —— 1.0 1.014 Fe ≤ 0.3 —— 0.315 Mn ≤ 0.1 —— 0.116 dissolvedoxygen ≥ 1.0 1.5 1.517 Faecalcoliformbacteria(quantity/L) ≤ —— 2000 200018 Totalcoliformbacteria(quantity/L) ≤ 3 —— 3
exTended deSIgn ConTenTS
deSIgn of grey WaTer ColleCTIon PIPe neTWorkSAllgreywaterfromstudentdormitoryiscollected.Twopipenetworksaresetindoor.Oneisconnectedwithgreywater(showerandwashwater)andanotherisconnectedwithblackwater(othersewerexceptshowerandwashwater).Greywateriscollectedanddischargeintothebaffletankofthetreatmentsystem.Theblackwaterfromstudentdormitoryandwastewaterfromteachingbuilding,officebuilding,andotherbuildingsdischargeintomunicipalsewersystem.
deSIgn of grey WaTer TreaTmenT STaTIon
maIn deSIgn PoInTS of eaCH ParT:• BaffleTank:Regulatingflowandqualityofgreywater.Regulation
Volumeis35%ofthetreatmentcapacity.(200m3/d)(BasedonthedatafromChinesedesignguidelineforreclaimedwater(GB50336-2002)
• HairFilter:Removinghairsandbiggersuspendingarticlesfromshowering.Hairfilterissetintheoutletpipeofthepump.Specification:DN200;mainpartheightis500mm;Referenceweight35kg.
• CoagulationandSedimentationTank:Thesuspendedsubstanceisremovedandtheflowisregulated.UsingCompleteSetsofEquipment(includingflocculationtank,sedimentationtank,filtrationtank,disinfectiontank,metricalinstrumentetc.)
• BiologicalAeratedFilter:Therectorisahighloadimmobilizedbiofilmandthree-phasereactor,whichhavetheadvantagesofbothactivatedsludgeprocessandbiofilmprocess.Therearefillersandairblast.Oxicwastewaterispurifiedthroughbio-membrane.Designflowis200m3/d(12.5m3/h,operatingtimeis16h/d).
• SandFilter:UsingCompleteSetsofEquipment.Filteringareais1.5m2.(Diameterofthesandgranule0.6~1.2mm).
• Middlewatertank:TheVolumeis30%oftheofreclaimedwaterconsumption(BasedonthedatafromChinesedesign.guidelineforreclaimedwater(GB50336-2002)
• Sludgetank:Thesludgefromthegreywatertreatmentstationandwastewaterisstoredinsludgetankandtransportedtomunicipalsewagetreatmentplantregularly
• Dosingandmixingequipment:Dosingsystemusecompletesetsofequipment;mixingequipmentuseTubularStaticMixer.
• Disinfectionequipment:usingchlorinedioxidedisinfection,dosingquantityis0.8mg/L
deSIgn objeCTIveS and ConTenTS
deSIgn objeCTIveS
ThedesignobjectiveistodevelopasustainablewatersystemforCMCNewCampus.Sub-objectivesare:
• Sustainablecycleofwater,nutrient,andenergy;• Makingfulluseofgreywaterandrainwatertomaintainqualified
aquaticeco-environmentincommunityandcontrolsoilerosion;• Usingreclaimedwaterforlandscapeirrigation,roadsprinkleand
complementaryoftheartificiallake.• BestManagementPractices(BMPs)forstormwatermanagement.
deSIgn ConTenTS
ThissustainablewatersystemdesignwillfocusonthePhase1ofthenewcampus.Thedesigncontentsinclude:
• Designofthegreywatercollectionpipelinenetworksfromthewest-ernstudentdormitory.
• Designofthegreywatertreatmentstation.• Designoftherainwaterharvestingandpurifyingsystemofteaching
area.• Waterqualitymaintenancefortheartificiallakeincampus.
exTended deSIgn ConTenTS (continued)
deSIgn of raInWaTer HarveSTIng and PurIfyIng SySTem
Fig.7DesignschematicdrawingofgreywaterTreatmentProcedure
• Cobbleditcha) Road-sideCobbleditch(RectangleStyle)the widthhasthreekindsb=400mm,600mm,680mm Divideintwo-stagefilling: onsurface:Φ=40-50mm,Cobble; atthebase:Φ=15-30mm,gravel Thedesigndegreeofslopeis<0.2%b) Building-aroundCobbleditch(RectangleStyle) thewidthhasthreekindsb=400mm,600mm, 680mmDivideintwo-stagefilling: onsurface:Φ=40-50mm,Cobble atthebase:Φ=15-30mm,gravel Thedesigndegreeofslopeisi<0.2%c) Square-sideCobbleditch (RectangleStyle)thewidthhas threekindsb=400mm,600mm, 680mm.Divideintwo-stagefilling: onsurface:Φ=40-50mm,Cobbleatthebase:Φ=15-30mm,gravel Thedesigndegreeofslopeisi<0.2%
• Landscapepools Afterbeingtreatedbygreenbillabongandcobbleditch,rainwateris
treatedthroughlandscapepool.Therearefivedecentralizedlandscapepools.Thesizeofthelandscapepoolsaredesignedaccordingtothe13mmrunoffofthecorrespondingcatchmentarea.
deSIgn of raInWaTer HarveSTIngand PurIfyIng SySTemInordertoensurethewaterqualityoftheartificiallakeandrecyclingwater,itisnecessarytoconstructecologicallakebank.AndItisalsonecessarytoapplycirculationwetlandtreatmentforartificiallake.i.e,lakewaterintheartificiallakewillbepumpedtowetlandsystem1#withcirculationpumpsandthentreatedthroughwetlandsystem1#°Afterthatthewaterdischargeintoartificiallakeagain.
InnovaTIon and SIgnIfICanCe
InnovaTIon• Integrationschemeofgreywaterreuseandlandscape/aesthetic.• Acombinationofgreywatertreatmentsystemandrainwaterpurifying
system.• Acombinationofrainwaterharvestingandpurifyingsystemand
landscapedesign.• Usingecologicaltheoryactsandhuman-orientedasthefoundationof
design,tocreateaclean,safetyandcomfortablewatercircumstance.
SIgnIfICanCe• TrainingandDisseminationa) Thedemo-projectcanbecomeapartialcontentofnational
demonstrationas“resourcesavingcampus”and“sustainablebuilding”.b) Asuccessfulintegrationofgreywaterreuseandlandscape/aesthetic
purposewillbeaparadigmforUniversities/Collegestolearnfrom.c) Thedemo-projectwillalsobecomeastudycaseforstudents,whowill
influencethefuturesocietywiththeideaintheirmind.d) Thedemo-projectcanbehopefullyselectedasademonstrationof
“resourcesavingcampus”inChina,andtrainingactivitiescanbeimplementedaftertheconstructionworkinChongqing.
• WaterSaving,EnvironmentalandEconomicBenefitsAnalysisa) Whenutilizinggreywaterandrainwater,97702.3m3/yearmunicipalwater
willbereplaced.AssumecostsforrainwaterandgreywatercollectionandtreatmentareRMB0.2/m3,municipalwatersupplyprice,accordingtoXinducitydomesticwatercharge,isRMB1.35/m3.Therefore,foreachton,RMB1.15/m3willbesaved,RMB112,400waterchargeswillbesavedinayear.Consideringthatwaterchargeswillbeincreasedinthefuture,thepotentialeconomicalbenefitsareremarkable.
b) Afterusinggreywater,annualsewagedischargereductionwillbe82252.8m3/year,bringingremarkableenvironmentalbenefits.Nowadays,Xinduisincreasingsewagecharges,fromRMB0.15/m3toRMB0.35/m3.Byreusinggreywater,sewagechargereductionwillbe82252.8×0.35=RMB28788.Watersavinghasgreatbenefits.
c) Inthisproject,totalrainwaterreusedis24787.4m3/year,reducing36%oftotalrainwaterinteachingbuildingarea.Municipalrainwaternetworksizecanbereducedaccordingly,andenvironmentalimpactsfrompollutantsonreceivingwaterscanbecontrolled.
Fig.6greywatercollectionpipenetworks
Fig.8Theprocedureofrainwaterharvestingandtreatment
Fig.9Road-sideCobbleditch
Fig.10Building-aroundCobbleditch
Fig.11Square-sideCobbleditch
chongqing_demo_A1_poster.indd 1 20/11/2008 11:07:37
