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- W2023602131 abstract "Coupled Aerobic-anoxic Nitrous Decomposition Operation (CANDO) is a new process for wastewater treatment that removes nitrogen from wastewater and recovers energy from the nitrogen in three steps: (1) NH4+ oxidation to NO2–; (2) NO2– reduction to N2O gas; and (3) N2O conversion to N2 with energy production. In this work, we optimize Steps 1 and 2 for anaerobic digester centrate, and we evaluate Step 3 for a full-scale biogas-fed internal combustion engine. Using a continuous stirred reactor coupled to a bench-scale sequencing batch reactor, we observed sustained partial oxidation of NH4+ to NO2– and sustained (3 months) partial reduction of NO2– to N2O (75–80% conversion, mass basis), with >95% nitrogen removal (Step 2). Alternating pulses of acetate and NO2– selected for Comamonas (38%), Ciceribacter (16%), and Clostridium (11%). Some species stored polyhydroxybutyrate (PHB) and coupled oxidation of PHB to reduction of NO2– to N2O. Some species also stored phosphorus as polyphosphate granules. Injections of N2O into a biogas-fed engine at flow rates simulating a full-scale system increased power output by 5.7–7.3%. The results underscore the need for more detailed assessment of bioreactor community ecology and justify pilot- and full-scale testing." @default.
- W2023602131 created "2016-06-24" @default.
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- W2023602131 date "2014-05-09" @default.
- W2023602131 modified "2023-10-14" @default.
- W2023602131 title "Production of Nitrous Oxide From Anaerobic Digester Centrate and Its Use as a Co-oxidant of Biogas to Enhance Energy Recovery" @default.
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- W2023602131 doi "https://doi.org/10.1021/es501009j" @default.
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