naa a22 4500 510819192 CHVBK 20180411083522.0 cr unu---uuuuu 180411e20130601xx s 000 0 eng 10.1007/s11814-013-0041-8 doi (NATIONALLICENCE)springer-10.1007/s11814-013-0041-8 Increased hydrazine during partial nitritation process in upflow air-lift reactor fed with supernatant of anaerobic digester effluent [Elektronische Daten] [Jeongdong Choi, Sokhee Jung, Young-Ho Ahn] The optimal balance of ammonium and nitrite is essential for successful operation of the subsequent anammox process. We conducted a partial nitritation experiment using an upflow air-lift reactor to provide operational parameters for achieving the optimal ratio of ammonium to nitrite, by feeding supernatant of anaerobic digester effluent, highnitrogen containing rejection water. Semi-continuous operation results show that HRT should be set between 15 and 17 hours to achieve the optimum ration of 1.3 of NO2-N/NH4-N. In the UAR, nitritation was the dominant reaction due to high concentration of ammonia and low biodegradable organics. The influent contained low concentrations of hydroxylamine and hydrazine. However, hydrazine increased during partial nitritation by ∼60-130% although there was no potential anammox activity in the reactor. The partial nitritation process successfully provided the ratio of nitrogen species for the anammox reaction, and relived the nitrite restraint on the anammox activity by increasing hydrazine concentration. Korean Institute of Chemical Engineers, Seoul, Korea, 2013 Hydrazine nationallicence Hydroxylamine nationallicence Nitrite nationallicence Partial Nitritation nationallicence Anammox nationallicence Choi Jeongdong Department of Civil & Environmental Engineering, University of Alberta, T6G 2W2, Alberta, Canada aut Jung Sokhee Sustainability Consulting Group, Samsung SDS, 135-918, Yeoksam, Seoul, Korea aut Ahn Young-Ho Department of Civil Engineering, Yeungnam University, 712-749, Gyungsan, Korea aut Korean Journal of Chemical Engineering Springer US; http://www.springer-ny.com 30/6(2013-06-01), 1235-1240 0256-1115 30:6<1235 2013 30 11814 https://doi.org/10.1007/s11814-013-0041-8 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11814-013-0041-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Choi Jeongdong Department of Civil & Environmental Engineering, University of Alberta, T6G 2W2, Alberta, Canada aut NATIONALLICENCE 700 1- Jung Sokhee Sustainability Consulting Group, Samsung SDS, 135-918, Yeoksam, Seoul, Korea aut NATIONALLICENCE 700 1- Ahn Young-Ho Department of Civil Engineering, Yeungnam University, 712-749, Gyungsan, Korea aut NATIONALLICENCE 773 0- Korean Journal of Chemical Engineering Springer US; http://www.springer-ny.com 30/6(2013-06-01), 1235-1240 0256-1115 30:6<1235 2013 30 11814 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer