Baix Llobregat wastewater treatment plant - bochure in ... - Krüger A/S

Reuse of wastewaterBaix Llobregat wastewater treatment plantin Barcelona, Spain

BarcelonaApprox. 4 million people live in and around Barcelona andalso the majority of the Catalonian industry is located inthis area.The water supply to the town comes from groundwateras well as treated water from the river of Llobregat that isrelatively saline.Clear wateris a limited, however,vital ressource in theMediterranean area.Barcelona has taken theconsequences and nowreuses the treatedwastewater.The aquaticenvironmentin CataloniaTo reduce the use of the limitedwater resources the Spanish Ministryof the Environment has decidedto treat and reuse a part of thetown’s wastewater.The treated wastewater is applied for irrigation of thefarm land around the river as well as some of the golfcourses in the areaFurthermore, a part of the treated wastewater isreturned to the river to maintain the water level andensure an increased flowAt the same time, a part of the treated wastewater isled to a reverse osmosis plant for further treatmentand the water is pumped to the underground toavoid salt water from the sea to seep into the groundwaterresources.2

Baix Llobregatwastewatertreatment plantThe plant is a activated sludgeplant and one of Europe’s largerplants treating the wastewaterfor approx. 2 million people andhaving a capacity of 420,000 m³wastewater/day.The biological part of the treatment removes approx. 92%of the suspended solids and the dissolved contaminationafter which three-quarters are led to a tertiary treatmentand then reused.The Baix Llobregat wastewater treatment plant isoperated by Depuradora del Baix Llobregat SA which isa public company owned by the Spanish Ministry of theEnvironment.In comparison thetwo plants in Copenhagen,Lynetten and Damhusåenoperated jointly by Lynettefællesskabet,treat wastewater correspondingto 1.1 million people andwith a capacity of 220,000 m³wastewater/dayReuse of the wastewaterIn cooperation with its Spanish sister company, Krügerhas designed and constructed the tertiary treatmentplant in Baix Llobregat.The plant consists of 3 compact and very efficient Actifloplants and 10 Hydrotech disc filters for polishing of thewater. The total capacity is 302,400 m³ treated wastewater/day.80%The combination of Actiflo and the discfilters provides a very robust and verycompact plant able to deal with very heavyhydraulic loads and substances. Thiscombination ensures an 80%-reductionof the area required compared to othersolutions of similar capacity and load.3

ACTIDisc®Actiflo – settling by means of sandThe phase of settling by means of sand is performed in threeActiflo lines, each line having a treatment capacity of 4,800m³/t and a settling rate of 120 m/t.In the flocculation phase, microsand particles are added to aidthe formation of flocs with a high density which increase thesettling rate by up to 60 times compared with conventionalprocesses. The process also comprises a unit of hydrocycloneswhich makes it possible to recover the microsand and thusreuse it in the process.Untreated wastewaterTreated wastewaterActiflocomprises four phases:CoagulationFlocculationMaturationLamella separationRecycledmicrosandHydrocycloneSludgeTo sludge treatmentRaw water inletTreatedwaterCoagulationMaturationMicrosandinjectionBallasted flocsto hydrocycloneHydrotech – tertiary filtrationAfter the settling phase, the water is led to 10 Hydrotech discfilters with a mesh width of 10 µm which polish the recoveredwater. Each disc filter has a capacity of 1,440 m³/t.Hydrotech is a state-of-the-art filtration system with disc filterswhich is very efficient and easily adjusted. The Hydrotechsystem provides a very advanced filtration and is a compactdesign which makes it very suitable for polishing of water onplants with limited space available.5

The advantages of the ACTIDisc® processThe water quality obtained by the ACTIDisc® processis always better than any other quality obtained insimilar processes. ACTIDisc® guarantees reduced turbidityand suspended solids and reduces the contentof helminth eggs.The process is very reliable as the quality of thetreated water is maintained at a response time ofless than 20 minutes independently of the possiblevariations in the quality of the inlet water.A very compact processThe space requirements to the process plant areminimal. Typically, providing space savings of up to80% compared to conventional plants.The process can be introduced on existing plants.The space saving also reduced the construction costs.The start-up of the ACTIDisc® process is very rapidwhich reduces the costs related to chemicals, energyand water.The ACTIDisc® operates by gravitation (withoutpumps) providing further energy savings.6

General dataCommissioning June 2006Average amount treated302,400 m³/dayMaximum amount treated 14,400 m³/hourActiflo - settling by ballasted sandMaximum settling capacity 3 x 4,800 m³/hourSettling rate120 m³/m² x hourHydrotech – tertiary filtrationMaximum treatment capacity 10 x 1,440 m³/hourMesh width in filters 10 µmDesign data Water quality requirements Expected valuesBOD5 ≤ 20 mg/l ≤ 10 mg/l ≤ 5 mg/lSS ≤ 50 mg/l ≤ 5 mg/l ≤ 5 mg/lTurbidity ≤ 50 NTU < 5 NTU < 2 NTUHelminth eggs < 1 U/1000 ml < 1 U/1000 ml7

DenmarkKrüger A/SGladsaxevej 363DK-2860 SøborgTel: 39 69 02 22kruger@kruger.dkwww.kruger.dkKlamsagervej 2-4DK-8230 ÅbyhøjTel: 87 46 33 00aarhus@kruger.dkSofiendalsvej 88DK-9200 Aalborg SVTel: 98 18 93 00aalborg@kruger.dkKrüger AquacareFabriksparken 50DK-2600 GlostrupTel: 43 45 16 76aquacare@kruger.dkwww.aquacare.dkSwedenVA-Ingenjörerna ABVretenvägen 13SE-171 54 SolnaTel: +46 8 579 781 20Fax: +46 8 579 78 1 21Olskroksgatan 30SE-416 66 GöteborgTel: +46 31-707 76 20Fax: +46 31-707 76 21Östra Torggatan 9SE-652 24 KarlstadTel: +46 54-17 75 40Fax: +46 54-17 75 41Runstensgatan 5SE-582 78 LinköbingTel: +46 13-24 03 50Fax: +46 13-24 03 51Scheelegatan 3SE-212 28 MalmöTel: +46 40-28 67 00Fax: +46 40-28 67 01Umestans FöretagsparkSE-903 47 UmeåTel: +46 90-70 05 30Fax: +46 90-70 05 31Svalgången 1SE-724 81 VästeråsTel: +46 21-17 26 50Fax: +46 21-17 26 51Trädgårdsgatan 12SE-702 12 ÖrebroTel: +46 19- 16 11 60Fax: +46 19- 16 11 61Östersund Rådhusgatan 90SE-831 45 ÖstersundTel: +46 63-55 12 80Fax: +46 63-55 12 81Krüger Akvapur ABVretenvägen 13SE-171 54 SolnaTel: +46 8 587 663 00Fax: +46 8 587 663 10info@kruger.seAnoxKaldnesKlosterängsvägen 11ASE-226 47 LundTel: + 46 46 - 18 21 50Fax :+ 46 46 - 13 32 01sweden@anoxkaldnes.comHydrotech ABMejselgatan 6SE-235 32 VellingeSwedenTel. +46 40 42 95 30Fax +46 40 42 95 31mailbox@hydrotech.seNorwayAnoxKaldnesHegnasletta 113217 SandefjordTlf:+ 47 91 60 80 00Faks: +47 33 48 50 01norway@anoxkaldnes.comFinlandI. Krüger OyRuosilantie 14FIN-00390 HelsinkiTel: +358 9 4770 9041osmo.hyyrynen@veoliawater.comAquaflow Ltd.Kirkkokatu 7B, P.O. Box 116FIN-57101 SavonlinnaTel: +358 15 51 731info@aquaflow.fiRuosilantie 14FIN-00390 HelsinkiTel: +358 9 4770 9011info@aquaflow.fiTullikatu 11FIN-21100 NaantaliTel: +358 50 32 69 658info@aquaflow.fiLithuaniaUAB KrügerOdminiu str. 3LT-01122 VilniusTel: +370 650 26 940PolandVeolia Water Solutions &Technologies Sp. z o.o.Wroclawska 53PL-30-011 KrakowTel: +48 12 423 38 66Fax: +48 12 423 34 82info.poland@veoliawater.comul. 17 Stycznia 72PL-02-146 WarszawaTel: +48 22 886 44 06 to 08Fax: +48 22 886 44 05RussiaOOO ECOTEK og Krüger A/Sul. Dm. Donskogo 7Kaliningrad, 236000Tel: + 7 (4012) 57 87 83Fax: +7 (4012) 57 88 67ecotek@gazinter.net