title: Comparison of nitrous oxide emissions in partial nitrifying and full nitrifying granular sludge reactors treating ammonium-rich wastewater.
abstract: The objective of this study was to evaluate the nitrous oxide (N2O) emissions in partial nitrifying and full nitrifying granular sludge reactors treating ammonium-rich wastewater. During stable operation, there was no significant difference of NH4(+)-N removal efficiencies between the two granular reactors. Nitrate and nitrite were the main effluent nitrogen species of the two reactors, and nitrite accumulation rate of partial nitrifying reactor was high of 87.79±2.03%. However, partial nitrifying granular-reactor had better total nitrogen removal efficiency (41.84±3.35%) than that of full nitrifying granular-reactor (19.91±2.12%). According to typical cycles, the N2O emission amount per cycle of partial nitrifying reactor account for 11.48% of the incoming nitrogen load, which was 1.5 times higher than that of full nitrifying reactor (7.47%). The obtained results could provide more information for understanding of N2O emission in granular sludge systems.
authors.affiliation: School of Resources and Environmental Sciences, University of Jinan, Jinan 250022, China.
authors.forename: Dong
authors.initials: D
authors.lastname: Wei
authors.affiliation: School of Resources and Environmental Sciences, University of Jinan, Jinan 250022, China.
authors.forename: Li
authors.initials: L
authors.lastname: Shi
authors.affiliation: School of Resources and Environmental Sciences, University of Jinan, Jinan 250022, China.
authors.forename: Ge
authors.initials: G
authors.lastname: Zhang
authors.affiliation: School of Resources and Environmental Sciences, University of Jinan, Jinan 250022, China.
authors.forename: Yifan
authors.initials: Y
authors.lastname: Wang
authors.affiliation: School of Resources and Environmental Sciences, University of Jinan, Jinan 250022, China.
authors.forename: Shusheng
authors.initials: S
authors.lastname: Shi
authors.affiliation: School of Resources and Environmental Sciences, University of Jinan, Jinan 250022, China; Key Laboratory of Chemical Sensing & Analysis in Universities of Shandong, School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, China.
authors.forename: Qin
authors.initials: Q
authors.lastname: Wei
authors.affiliation: School of Resources and Environmental Sciences, University of Jinan, Jinan 250022, China.
authors.forename: Bin
authors.initials: B
authors.lastname: Du
mesh_terms: D000641:Ammonia / Q000032:analysis*; D019149:Bioreactors; D002849:Chromatography, Gas; D058465:Nitrification; D009573:Nitrites / Q000378:metabolism; D009609:Nitrous Oxide / Q000378:metabolism*; D012722:Sewage / Q000382:microbiology*; D062065:Wastewater / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
chemical_list: D000641:Ammonia; D009573:Nitrites; D009609:Nitrous Oxide; D012722:Sewage; D062065:Wastewater
keywords: Granular sludge; Nitrous oxide emissions; Partial nitrification; Sequencing batch reactor (SBR)