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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