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March 2013 Bioaugmentation updated 2012 Emerging Technologies Technology Summary Bioaugmentation (continued) Aeration Tank 3 (AT3) Process: The AT3 process is similar to BAR process but differs in sending a smaller fraction of the RAS to the reaeration tank, and it has a downstream anoxic zone. The process goal is to stop the nitrification process at the nitrite stage (nitritation) by control of dissolved oxygen and pH to reduce the consumption of carbon and oxygen for complete denitrification. Adding an external carbon source at the anoxic zone might be needed to accomplish denitrification. Mainstream AUtotropic Recycle Enabling Enhanced N-removal (MAUREEN) Process: The MAUREEN process includes a sidestream bioreactor to allow for nitrification and denitrification of the centrate stream. The configuration is similar to the AT3 process but has biomass recycling at the sidestream reactor. This process was developed for the Blue Plains Advanced Wastewater Treatment Plan (AWTP) and provides significant flexibility when applied to the two-sludge system at the plant. The configuration includes preferential bioaugmentation of ammonia-oxidizing bacteria from the second to the first stage via the sidestream reactor and oxidation of ammonia in reject centrate to nitrite in the enrichment reactor, resulting in reduced power and chemical consumption. This process has the ability to fortify the second-stage system with a combination of primarily ammonia oxidizers and anoxic methanol-degrading bacteria produced in the sidestream reactor under conditions that would limit the presence of nitrite-oxidizing bacteria and heterotrophic bacteria. Supernatant from the sidestream process can be used for odor and corrosion control in the headworks or in process streams at the plant. Key to the success of the process is the physical configuration and selection of operating conditions of the sidestream reactor. Process Flow Diagram for MAUREEN Process Wastewater Treatment and In-Plant Wet Weather Management 3-13PDF Image | Emerging Tech for Wastewater Treatment
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