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March 2013 Emerging Technologies Anaerobic Processes updated 2012 Technology Summary Anaerobic Migrating Blanket Reactor (AMBR) Objective: State of Development: Improve wastewater treatment efficiency. Research (for municipal applications). Description: AMBR is an anaerobic process that uses a blanket of granular biomass and produces biogas. The granular biomass allows for operation at very long solids retention times so the AMBR process can be operated at ambient temperatures that would require heating for non-granular, anaerobic processes at shorter solids retention times. AMBRs use multiple tanks in series (a minimum of three) with gentle mixing in each to enhance transport of substrate into the granules. No recycle is required. The serial configuration causes the biomass to migrate toward the final tank, which, because it has the lowest concentration of substrate, produces little biogas, thereby allowing it to act as an internal clarifier with settling of the granular biomass. Because the final tank allows the less dense biomass to escape while retaining granular biomass, it effectively selects for biomass that is granular. To prevent excessive accumulation of biomass in the final tank, the flow of wastewater is reversed periodically by alternating the influent feed and effluent withdrawal points, thereby redistributing biomass toward the other end of the reactor. The simple design, lack of heating, and the low biomass production typical of anaerobic processes combine to make AMBR highly efficient operationally. Bench-scale testing has shown the AMBR process to achieve 59 percent removal of COD from nonfat dry milk at 15 °C, with improved removal of 80 to 95 percent at 20 °C (Angenet, 2001). Therefore, although the AMBR process could be a viable process for pretreating industrial wastewater, at domestic wastewater treatment facilities it would likely need to be combined with a downstream aerobic process for effluent polishing. The AMBR process has been applied at a full-scale installation for remediation of dairy wastes and in trials for remediation of perchloroethylene (PCE), p-Nitrophenol, and other groundwater contaminants. Research has been performed to simulate treatment of domestic wastewater using AMBR (Angenent et al., 2001); however, no full scale installations are now in place. Comparison to Established Technologies: AMBR is an anaerobic process using a blanket of granular biomass similar to that developed in upflow anaerobic sludge blanket (UASB) reactors. Unlike the UASB process, AMBRs do not require the use of elaborate gas-solids separators and feed distribution systems. Flow reversal is sufficient to contain the granular biomass in the bioreactor so the use of packing or external settlers for solids capture is not required. Like other anaerobic processes, the AMBR process produces biogas, but unlike most other anaerobic processes, it requires no heating. Because it also does not require aeration, the AMBR process is more energy efficient than aerobic processes. It also produces less waste sludge than aerobic processes. However, effluent quality is marginal compared to aerobic processes and might require the use of a smaller aerobic process downstream of the AMBR process to meet discharge limits. Nutrient removal is minimal. Available Cost Information: Approximate Capital Cost: Unavailable because no full-scale facility is in place. Approximate O&M Costs: Unavailable because no full-scale facility is in place. Vendor Name(s): Developer Largus (Lars) Angenent Cornell University Dept of Biological and Environmental Engineering 214 Riley-Robb Hall Ithaca, NY 14853 Telephone: 607-255-2480 Fax: 607-255-4080 Email: la249@cornell.edu Web site: http://angenent.bee.cornell.edu Installation(s): Full-scale industrial application in Costa Rica was shut down. No full-scale installation is in place. Wastewater Treatment and In-Plant Wet Weather Management 3-41PDF Image | Emerging Tech for Wastewater Treatment
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