Actiflo - Veolia Water Solutions & Technologies

Ballasted clarification for a very high rateand compact processActiflo® is a compact process that operates with microsand (Actisand)as a seed for floc formation. Actisand provides surface area that enhancesflocculation and also acts as a ballast or weight to aid a rapid settlement.Actiflo® is recommended for:> surface water clarification,> industrial process water production,> wastewater treatment,> storm flow water settlement.Actiflo®: compactness displaying its true potentialThe microsand ballasted flocs display unique settling characteristics, which allowfor clarifier designs with very high overflow rates and short retention times.These designs result in footprints that are 5 times smaller than classic lamellaclarifier or dissolved air flotation (DAF) and up to 20 times smaller thanconventional clarification systems.Major process benefitsHigh treatment efficiency;removal rate of turbidity > 90%Very small footprint compared toconventional clarifiers; suited forrestricted spaces and easy retrofitof existing plantsReduced civil engineeringFlexible: reacts quickly to changingraw water quality; providesconsistently high quality effluentVery short start-up time < 10 minutesThe sludge produced can be thickenedand dewatered easilyCan be entirely automatedand remotely controlledMinimum equipment to maintain,all easily accessible15 years of operating experiencewith more than 300 Actiflo®references worldwidePrefabricated package plants(1 000 to 10 000 m 3 /d per unit)which can be combined for largerflow ratesFlat bottom clarifier0.5-1.5 m/hr.Sludge blanketclarifier 4 m/hr.DAF or lamellaclarifier 10-15 m/hr.Actiflo®> 40 m/hr.Sludge blanketclarifier180 000 m 3 /dActiflo 180 000 m 3 /dOverview of the Iver plant, London - Heathrow (United Kingdom).Clarification, interozonation and granular activated carbon filtrationfor drinking water production.