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Emerging Technologies Bioaugmentation updated 2012 March 2013 Technology Summary Bioaugmentation (continued) In-Nitri® Process: A patented process known as the Inexpensive Nitrification or In-Nitri® process uses a separate activated sludge process (aeration tank and clarifier) to treat the ammonia-rich sidestream from digester supernatant or dewatering. Compared to the mainstream, the sidestream has a much greater ammonia-N:COD ratio and usually a higher temperature, a nitrifying SRT can be maintained in a much smaller aeration basin. Further, the excess sludge from the sidestream system acts to augment the nitrifiers in the mainstream aeration tank. With the nitrifier bioaugmentation from the sidestream, the SRT required to achieve nitrification in the mainstream reactor is reduced. The process has the advantage of achieving year- round nitrification by reducing the SRT by adding only a small aeration tank and clarifiers for growing nitrifiers. Process Flow Diagram for Inexpensive Nitrification Immobilized Cell-Augmented Activated Sludge (ICAAS) Process: Immobilized cells are maintained for a specific treatment activity and are enriched in a reactor for bioaugmentation. The ICAAS process employs the immobilized cells that are activated and maintained for their specific treatment activity in an offline enricher reactor for bioaugmentation. The process has been effectively used in bench-scale reactors for treating hazardous-compound shock loads, to achieve enhanced nitrate removal and to increase general performance of the treatment process. Seeding from Parallel Processes: Two schemes have been proposed to grow nitrifiers in a membrane bioreactor and seed a high-rate BNR process. However, results on pilot or full-scale trials have not yet been reported. Another approach included two parallel activated-sludge processes, tertiary nitrifying membrane bioreactor seeding paralleling a high-rate activated sludge process. Some process issues in this scheme are that membranes select for filtering, not settling biomass; seeding effectiveness is likely affected by predation; and the process fits only some nutrient-removal flow diagrams. 3-10 Wastewater Treatment and In-Plant Wet Weather ManagementPDF Image | Emerging Tech for Wastewater Treatment
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