Partial nitritation was pointed out as the key step to implement autotrophic nitrogen removal processes at low temperature. This study investigated initiation and maintenance of a process with simultaneous COD in sequencing batch reactor (SBR) run 15 °C fed primary settled urban wastewater characterized by 42 ± 10 mg TOC/L 45 4 NH4+-N/L. A nitrite accumulation ratio nearly 100% observed long-te...

Abstract Nitrous oxide emissions can contribute significantly to the carbon footprint of municipal wastewater treatment plants even though from conventional nitrogen removal processes are assumed be moderate. An increased risk for high occur in connection with process disturbances and nitrite (NO2?) accumulation. This work describes findings at a large plant where levels NO2? activated sludge e...