Fixed Film Wastewater Treatment

Fixed Film Wastewater TreatmentThe Submerged Aerobic Fixed Film (SAFF) process uses support media to retain an active biomass to reduce the influent BOD Levels. Tubular diffusers are used with the SAFF media giving a good air dispersal and low level of blockage due to growth of biological film.SAFF reactor is a type of aerobic attached growth treatment process. Small foot print area, stable process, lesser sludge production and cellar installations are the key features of SAFF process. Essentially SAFF system is a hybrid reactor where attached growth and suspended growth activity takes place simultaneously.This technology utilizes an aerobic fixed film process that is a combination submerged attached growth and activated sludge processes.PrincipleSAFF Reactor: To degrade organicsTube Settler & Polishing Filters: To separate the biomass Achieve absolute filtration. AdvantagesNo sludge re-circulation is required to maintain MLSS as in the case of conventional aeration system.Can be designed to any size to deal with larger flow and loads.Fine bubble diffused aeration used generally reduces the energy requirements as compared to surface aerators.Modular units easily installed.The tank does not need to be drained for access to the diffusers or media.SAFF system takes higher shock loads without reducing the plant performance because of large quantity of MLSSavailable inside the reactor.SAFF supports low sludge generation, low Odour and low visual impact.Maintenance requirements are simple. BenefitsHydraulic Retention Time (HRT) of 4-6 hours vs 10 - 16 hoursSolids Retention Time (SRT) of 15-365 days, can vary based on flow without negativeProcess impact.MLSS of 10-15,000 mg/L.Sludge Yield of 20-40% less than conventional.Modular expandability.Highest quality effluent.Less susceptible to upsets due to flow variations.Less odor.Simple, yet sophisticated.