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March 2013 Treatment updated 2012 Emerging Technologies Technology Summary BioActiflo® Process Objective: State of Development: Biological treatment with high-rate clarification of wet Adaptive Use. weather flows. Description: The BioActiflo® process is a high-rate process that combines biological treatment with the Actiflo® ballasted flocculation high-rate clarification process (see separate fact sheet for the Actiflo® process). Biological treatment is provided by a solids contact basin which is used ahead of the Actiflo high rate clarification. This basin has a shorter hydraulic retention time and a lower mixed liquor suspended solids (MLSS) concentration than conventional aeration basins. Biological solids in the return activated sludge (RAS) are used to uptake soluble biochemical oxygen demand (BOD) and use it as a substrate. Testing to date has shown that the uptake rate is a function of the return activated sludge (RAS)/wastewater contact time and the amount of biological solids in contact with the primary wastewater. The target concentration of MLSS in the contact basin is maintained by using a portion of the RAS stream in addition to concentrated sludge from the Actiflo high - rate clarification process. The MLSS is aerated for rapid BOD uptake by the biomass and then flows from the solids contact tank to the Actiflo® high-rate clarification process which uses coagulation, injection of microsand and polymer, settling and sand recirculation as described in the Actiflo Technology Summary in Chapter 2 of this document. The result is a process that provides high removal efficiency of BOD, as well as suspended solids, thereby achieving biological treatment of excess flows while preserving the integrity of plant processes and washout of biomass. Pilot testing of the BioActiflo® process was conducted in Fort Smith, AR in 2004 to 2006, Port Orchard, WA in 2007, and Knoxville, TN in 2010. Bench scale testing was conducted at the Wilson Creek Regional Wastewater Treatment Plant in Lucas, Texas. The first BioActiflo installation was commissioned in 2012 in Akron OH and pilot testing is in progress. This testing is focusing on BioActiflo performance for BOD and total suspended solids (TSS), as well as looking at pathogen removal. While pilot testing to date has shown that the process is capable of achieving total BOD removal exceeding 85% and TSS removal of 90% or higher, current additional testing will provide additional information on process reliability in achieving TBOD and TSS removal targets. Diagram of BioActiflo® Configuration (in green) at a Wastewater Treatment Plant Wastewater Treatment and In-Plant Wet Weather Management 4-19PDF Image | Emerging Tech for Wastewater Treatment
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