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

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