Reuse of wastewater Baix Llobregat wastewater treatment plant in Barcelona, Spain

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BarcelonaApprox. 4 million people live in and around Barcelona and also the majority of the Catalonian industry is located in this area.

The water supply to the town comes from groundwater as well as treated water from the river of Llobregat that is relatively saline.

Clear water is a limited, however, vital ressource in the Mediterranean area.

Barcelona has taken the consequences and now

reuses the treated wastewater.

The aquatic environment in Catalonia

To reduce the use of the limited water resources the Spanish Minis-try of the Environment has decided to treat and reuse a part of the town’s wastewater.

Thetreatedwastewaterisappliedforirrigationofthefarmlandaroundtheriveraswellassomeofthegolfcoursesinthearea

Furthermore,apartofthetreatedwastewaterisreturnedtotherivertomaintainthewaterlevelandensureanincreasedflow

Atthesametime,apartofthetreatedwastewaterisledtoareverseosmosisplantforfurthertreatmentandthewaterispumpedtotheundergroundtoavoidsaltwaterfromtheseatoseepintotheground-waterresources.

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Baix Llobregat wastewater treatment plant

The plant is a activated sludge plant and one of Europe’s larger plants treating the wastewater for approx. 2 million people and having a capacity of 420,000 m³ wastewater/day.

Thebiologicalpartofthetreatmentremovesapprox.92%ofthesuspendedsolidsandthedissolvedcontaminationafterwhichthree-quartersareledtoatertiarytreatmentandthenreused.

TheBaixLlobregatwastewatertreatmentplantisoperatedbyDepuradoradelBaixLlobregatSAwhichisapubliccompanyownedbytheSpanishMinistryoftheEnvironment.

80%The combination of Actiflo™ and the disc

filters provides a very robust and very compact plant able to deal with very heavy

hydraulic loads and substances. This combination ensures an 80%-reduction of the area required compared to other solutions of similar capacity and load.

In comparison the two plants in Copenhagen, Lynetten and Damhusåen

operated jointly by Lynettefælles- skabet, treat wastewater corres-

ponding to 1.1 million people and with a capacity of 220,000 m³

wastewater/day

Reuse of the wastewaterIncooperationwithitsSpanishsistercompany,KrügerhasdesignedandconstructedthetertiarytreatmentplantinBaixLlobregat.

Theplantconsistsof3compactandveryefficientActiflo™plantsand10Hydrotechdiscfiltersforpolishingofthewater.Thetotalcapacityis302,400m³treatedwaste-water/day.

Reuse of treated wastewater

The tertiary treatment of the wastewater on the Baix Llobregat plant is performed by means of the state-of-the-art process ACTIDisc®

ACTIDisc®isauniquetechnologyforreuseoftreatedwastewaterasthewaterqualityobtainedatanygiventimecomplieswiththecurrentstandards.Atthesametimeitisaverycompacttechnologywhichisabletotreatlargeamountsofwateronarelativelysmallarea.

TheACTIDisc®isastate-of-the-artprocessdevelopedbyVeoliafortertiarytreatmentofwastewater.ThefirstphaseconsistsofsettlingbysandwhichisperformedbymeansoftheActiflo™process.ThesecondphaseconsistsoftertiaryfiltrationbydiscfilterswhichisperformedbymeansofHydrotechdiscfilters.ThesettlingwithballastedsandisperformedinthreeActiflo™linesandthefiltrationisperformedin10Hydrotechdiscfilterswithameshwidthof10µm.

The Baix Llobregat wastewater treatment plant has an average treatment capacity of 302,400 m³/day, and is thus one of the world’s largest recovery plants.

Biologicallytreated

wastewater

ForUVtreatment

Tertiary filtration HydrotechMaximumtreatmentcapacity:10x1,440m³/tMeshwidth:10µm.

ACTIFLO™ processSettlingbymeansofballastedsandMaximumtreatmentcapacity:3x4,800m³/tSettlingcapacity:120m/t

ACTIDisc® processReuseoftreatedwastewaterfromBaixLlobregat

wastewatertreatmentplant.Treatmentcapacity:302,400m³/day.

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Untreatedwastewater

ACTIDisc®Actiflo™ – settling by means of sandThephaseofsettlingbymeansofsandisperformedinthreeActiflo™lines,eachlinehavingatreatmentcapacityof4,800m³/tandasettlingrateof120m/t.

Intheflocculationphase,microsandparticlesareaddedtoaidtheformationofflocswithahighdensitywhichincreasethesettlingratebyupto60timescomparedwithconventionalprocesses.Theprocessalsocomprisesaunitofhydrocycloneswhichmakesitpossibletorecoverthemicrosandandthusreuseitintheprocess.

Hydrotech – tertiary filtrationAfterthesettlingphase,thewaterisledto10Hydrotechdiscfilterswithameshwidthof10µmwhichpolishtherecoveredwater.Eachdiscfilterhasacapacityof1,440m³/t.

Hydrotechisastate-of-the-artfiltrationsystemwithdiscfilterswhichisveryefficientandeasilyadjusted.TheHydrotechsystemprovidesaveryadvancedfiltrationandisacompactdesignwhichmakesitverysuitableforpolishingofwateronplantswithlimitedspaceavailable.

Treatedwastewater

Recycledmicrosand

HydrocycloneSludge Tosludgetreatment

Treatedwater

MaturationMicrosandinjection

Coagulation

Rawwaterinlet

Ballastedflocstohydrocyclone

Actiflo™comprises four phases:

CoagulationFlocculationMaturation

Lamella separation

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ThewaterqualityobtainedbytheACTIDisc®processisalwaysbetterthananyotherqualityobtainedinsimilarprocesses.ACTIDisc®guaranteesreducedtur-bidityandsuspendedsolidsandreducesthecontentofhelmintheggs.

Theprocessisveryreliableasthequalityofthetreatedwaterismaintainedataresponsetimeoflessthan20minutesindependentlyofthepossiblevariationsinthequalityoftheinletwater.

Thestart-upoftheACTIDisc®processisveryrapidwhichreducesthecostsrelatedtochemicals,energyandwater.

TheACTIDisc®operatesbygravitation(withoutpumps)providingfurtherenergysavings.

A very compact process

Thespacerequirementstotheprocessplantareminimal.Typically,providingspacesavingsofupto80%comparedtoconventionalplants.

Theprocesscanbeintroducedonexistingplants.Thespacesavingalsoreducedtheconstructioncosts.

The advantages of the ACTIDisc® process

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General dataCommissioning June2006Averageamounttreated 302,400m³/dayMaximumamounttreated 14,400m³/hour

Actiflo™ - settling by ballasted sandMaximumsettlingcapacity 3x4,800m³/hourSettlingrate 120m³/m²xhour

Hydrotech – tertiary filtrationMaximumtreatmentcapacity 10x1,440m³/hourMeshwidthinfilters 10µm

Design data Water quality requirements Expected valuesBOD5 ≤ 20 mg/l ≤ 10 mg/l ≤ 5 mg/l

SS ≤ 50 mg/l ≤ 5 mg/l ≤ 5 mg/lTurbidity ≤ 50 NTU < 5 NTU < 2 NTUHelminth eggs < 1 U/1000 ml < 1 U/1000 ml

Denmark

Krüger A/SGladsaxevej 363DK-2860 SøborgTel: +45 39 69 02 22kruger@kruger.dkwww.kruger.dk

Haslegårdsvænget 18DK-8210 AarhusTel: +45 87 46 33 00aarhus@kruger.dk

Indkildevej 6 CDK-9210 Aalborg SØTel: +45 98 18 93 00aalborg@kruger.dk

Krüger AquacareFabriksparken 50DK-2600 GlostrupTel: +45 43 45 16 76aquacare@kruger.dkwww.aquacare.dk

Sweden

VA-Ingenjörerna ABVretenvägen 13SE-171 54 SolnaTel: +46 8 579 781 20www.vaing.se

AnoxKaldnesKlosterängsvägen 11ASE-226 47 LundTel: + 46 46 - 18 21 50Fax :+ 46 46 - 13 32 01sweden@anoxkaldnes.com

Hydrotech ABMejselgatan 6SE-235 32 VellingeSwedenTel. +46 40 42 95 30mailbox@hydrotech.se

Norway

Krüger KaldnesHegnasletta 113217 SandefjordTel:+ 47 91 60 80 00Faks: +47 33 48 50 01post@krugerkaldnes.no

Finland

Aquaflow Ltd.Kirkkokatu 7B, P.O. Box 116FIN-57101 SavonlinnaTel: +358 (0)207 441 600info@aquaflow.fi

Ruosilantie 14FIN-00390 HelsinkiTel: +358 (0)207 441 642info@aquaflow.fi

Tullikatu 11FIN-21100 NaantaliTel: +358 (0)207 441 646info@aquaflow.fi

Poland

Veolia Water Solutions & Technologies Sp. z o.o.ul. Balicka 48PL-30-149 KrakowTel: +48 12 423 38 66Fax: +48 12 423 34 82info.poland@veoliawater.com

ul. Janka Muzykanta 6002-188 WarszawaTel: +48 (022) 205 39 39Fax: +48 (022) 205 39 38

May 2010

Lithuania

UAB KrügerOlimpiečių str. 1LT-09200 VilniusTel: +370 5 21 22 396jurate@kruger.lt Lativa

SIA ”Krüger”Brivibas str. 180LV-1012 RigaTel./fax: +371 67 292 529Mobile: +371 26 440 770marina.castnikova@veoliawater.com

Russia

OOO ECOTEK & Krüger A/Sul. Dm. Donskogo 7Kaliningrad, 236000 Tel: +7 (4012) 604 480ecotek@gazinter.net