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Emerging Technologies Bioaugmentation updated 2012 March 2013 Technology Summary Bioaugmentation (continued) In-Pipe Technology Process: This approach uses facultative microorganisms added to the sewer system upstream of the treatment facility with the goal of supplementing/modifying the biofilm on the walls of the sewer pipe. Using bioaugmentation in this way, the sewer is intended to become a part of the treatment process by reducing organic loading to the WWTP and transforming slowly degradable COD to readily degradable COD. Because sewer conditions generate relatively low sludge yield, waste activated sludge is decreased. Shearing of active biomass from the sewer walls provides indirect bioaugmentation to the downstream WWTP but would not include any significant nitrifier content. However, reducing COD loading and waste activated sludge production would result in an increased nitrifier fraction and an increased SRT for a given aerobic volume, thereby increasing nitrification capacity. In-Pipe Technology uses dosing units installed at strategic locations in the sewer system and resupplies them with concentrated microbial stock for a monthly fee per MGD treated. Trickling Filter and Pushed Activated Sludge (TF/PAS) Process: The earliest example of external bioaugmentation with nitrifiers generated in the plant from a wastewater source is likely that of the TF/PAS process, whereby the total organic loading on the trickling filter is adjusted to achieve about 50 percent nitrification, thus seeding nitrifiers to a downstream activated sludge step with a low SRT of 2 to 4 days. It appears that the enhanced nitrification rates achieved could be because of both the effect of seeding and removing toxicants in the wastewater by pretreatment of the trickling filter. Process Flow Diagram for Trickling Filter/Pushed Activated Sludge 3-8 Wastewater Treatment and In-Plant Wet Weather ManagementPDF Image | Emerging Tech for Wastewater Treatment
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