Data from Online THM Monitoring Aids Water

Treatment Opera7ons at Aigües de Barcelona JordiMar)n-Alonso,WaterQualityManager,SUEZSpainMichaelWest,ChiefScien@st,AquaMetrologySystems

AIGÜESDEBARCELONAmanagement GROUPAGBARmanagement OTHERCOMPANIESDRINKINGWATER:

DrinkingWaterTreatmentPlant

WasteWaterTreatmentPlant

Regeneratedwater

BEGUES

ST. JOAN DESPÍ

WWTPBegues

WWTPGavà-Viladecans

DWTPSantJoanDespí

WWTPBaixLlobregat

WWTPBesòs

DWTPBesòs

DWTPLaLlagosta

WWTPMontcadai

Reixac

WWTPVallvidrera

DWTPElPapiol

DWTPLesEstrelles

WWTPSantFeliu

BADIA DEL VALLÈS

CORNELLÀ DE LLOBREGAT

CASTELLDEFELS

GAVÀ

VILADECANS

TORRELLES DE LLOBREGAT

ST. CLIMENT DE LLOBREGAT

ST. BOI DE LLOBREGAT

EL PRAT DE LLOBREGAT

STA. COLOMA DE CERVELLÓ

ST. VICENÇ DELS HORTS

LA PALMA DE CERVELLÓ

CERVELLÓ

CORBERA DE LLOBREGAT

ST. ANDREU DE LA BARCA

CASTELLBISBAL

PALLEJÀ

EL PAPIOL

MOLINS DE REI

ST. FELIU DE LLOBREGAT

ST. JUST DESVERN

ESPLUGUES DE LLOBREGAT

L’HOSPITALET DE LLOBREGAT

BARCELONA

ST. CUGAT DEL VALLÈS

CERDANYOLA DEL VALLÈS

ST. ADRIÀ DE BESÒS

RIPOLLET

MONTCADA I REIXAC

STA. COLOMA DE GRAMENET

BADALONA TIANA

MONTGAT

Aigües de Barcelona, Empresa Metropolitana de Gestió del Cicle Integral de l’Aigua, S.A. (Public

(15%) – Private (85%) - Partnership company)

Population served: 3 M inhabitants (1,4 M customers)

Supplied water (2017): 160 hm3

Water supply network: 4.653 km

Descrip7on & Key Figures

Background •  TheSantJoanDespíDrinkingWaterTreatmentPlant(DWTP)

•  4.5m3/smixedconven@onalandadvancedtreatmentfacility•  Receivesamixofsurfacewaterandgroundwater

•  Inhot seasons, remote zonesof thedistribu@onnetworkwereexperiencingTHMvaluesupto80-90µg/L,whiletreatmentplantvalueswere10-25µg/L.

•  AigüesdeBarcelonawas looking tomonitorTHMvaluesmore frequently tobecerunderstandTHMevolu@on,improvewaterqualityandop@mizecosts.

•  Following valida@on at their onsite WQ laboratory, Aigües de BarcelonaselectedtheTHM-100instrumentduetoitsaccuracy,reliability,andabilitytoproduceahighfrequencyofdatainreal-@me.

•  OneinstrumentwasinstalledattheexitoftheWaterTreatmentPlantand4moreatstrategicloca@onsoftheDistribu@onNetwork.

Sant Joan Despí DWTP

AerialPlantView

ROFacility

Strategic Placement of THM-100 Instrumenta7on

•  DrinkingWaterTreatmentPlant(THM&THM-FP)•  Distribu@onNetworkinfluencedbytheDWTP•  3pointswherepurchasedwaterenterstheSystem(controlofthequalityofwatertreatedbythelocalAdministra@on)

Online THM Monitoring

•  TTHMmeasurement~120minutes•  THM-FPmeasurement~180minutes•  6samplesdaily•  Automatedprocess•  Providesreal@medataonexis@ngandfutureTHMlevelstoenableproac@veplantopera@ons•  1monitoratWTP•  4monitorsinnetworkandatcompliancehandoverpoints

•  Systemismonitoredbymanufacturer24/7/365•  Datareceivedon-lineintheoperator’sSCADA

Online Monitoring of THM Data

Dataarecon@nuouslysenttotheSCADAsystem,wherealarmsareconfigured

Conduc@vity MajorTHM(CHCl3orCHBr3) TTHM

Regulatory Compliance •  InAugust2016,AigüesdeBarcelona’sLaboratoryreceivedaccredita@ontotheISO/IEC17025:2005StandardfortheuseoftheonlineTHMmonitortocon@nuouslymonitorTHMs.•  Accurateandrepeatableresultsplusregularqualitycontrolsarerequiredtomee@ngISOaccredita@onrequirements.•  NoothercommerciallyavailableonlineTHManalyzeroperatesorisvalidatedtosuchrigorousstandards:•  Significantbreakthroughintheapplica@onofonlinefield-basedinstrumentsforregulatorycontrolofwaterquality

San Joan Despí WTP Op7miza7on

• DuringlowdailyTHMandTHM-FPlevels,treatmentisadjustedsothatalowerpercentageofwateristreatedbytheROline,producinganaveragecostssavingof>$35,000/month(€30,000/month):•  ChangeinthenumberofROracksinuse• Waterblending(introduc@onofgroundwater)

• Otheropera@onalchangesincludeareduc@onoftheresidence@mesoftreatedwaterinthenetworkandstoragetanksand,wherefeasible,loweringre-chlorina@ondoses.

Conclusions

•  OnlineTHMandTHM-FPmonitoringhashelpedAigüesdeBarcelona:•  Op@mizetreatmentprocesses•  Assistinmonitoringwaterqualityathandoverpointsandimprovethequalityofwaterproducedatthetreatmentplantandsuppliedalongthedistribu@onnetwork

•  Reduceopera@onalexpenseswhileensuringregulatorycompliance

•  IntensifythecontrolandimprovethequalityofwaterpurchasedtotheAdministra@on

•  ImprovetheconfidenceoftheRegulator(intensivecontrol,onlineavailabilityofresultsandISO17025accredita@onofthemeasurements)