title: Reduction of nitrous oxide emissions from partial nitrification process by using innovative carbon source (mannitol).
abstract: The purpose of this study was to evaluate the effect of mannitol as carbon source on nitrogen removal and nitrous oxide (N2O) emission during partial nitrification (PN) process. Laboratory-scale PN sequencing batch reactors (SBRs) were operated with mannitol and sodium acetate as carbon sources, respectively. Results showed that mannitol could remarkably reduce N2O-N emission by 41.03%, without influencing the removal efficiency of NH4(+)-N. However, it has a significant influence on nitrite accumulation ratio (NAR) and TN removal, which were 19.97% and 13.59% lower than that in PN with sodium acetate, respectively. Microbial analysis showed that the introduction of mannitol could increase the abundance of bacteria encoding nosZ genes. In addition, anti-oxidant enzymes (T-SOD, POD and CAT) activities were significantly reduced and the dehydrogenase activity had an obvious increase in mannitol system, indicating that mannitol could alleviate the inhibition of N2O reductase (N2OR) activities caused by high NO2(-)-N concentration.
authors.affiliation: Shandong Provincial Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, 27 Shanda Nanlu, Jinan 250100, Shandong, PR China.
authors.forename: Xinwen
authors.initials: X
authors.lastname: Zhang
authors.affiliation: Shandong Provincial Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, 27 Shanda Nanlu, Jinan 250100, Shandong, PR China.
authors.forename: Xiaoqing
authors.initials: X
authors.lastname: Wang
authors.affiliation: Shandong Provincial Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, 27 Shanda Nanlu, Jinan 250100, Shandong, PR China.
authors.forename: Jian
authors.initials: J
authors.lastname: Zhang
authors.affiliation: Shandong Provincial Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, 27 Shanda Nanlu, Jinan 250100, Shandong, PR China.
authors.forename: Xiaoyu
authors.initials: X
authors.lastname: Huang
authors.affiliation: Shandong Provincial Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, 27 Shanda Nanlu, Jinan 250100, Shandong, PR China.
authors.forename: Dong
authors.initials: D
authors.lastname: Wei
authors.affiliation: Shandong Provincial Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, 27 Shanda Nanlu, Jinan 250100, Shandong, PR China.
authors.forename: Wei
authors.initials: W
authors.lastname: Lan
authors.affiliation: Shandong Provincial Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, 27 Shanda Nanlu, Jinan 250100, Shandong, PR China. Electronic address: huzhen885@sdu.edu.cn.
authors.forename: Zhen
authors.initials: Z
authors.lastname: Hu
mesh_terms: D019149:Bioreactors; D002244:Carbon / Q000737:chemistry / Q000378:metabolism; D008353:Mannitol / Q000737:chemistry / Q000378:metabolism; D058465:Nitrification; D009609:Nitrous Oxide / Q000032:analysis / Q000737:chemistry / Q000378:metabolism
chemical_list: D008353:Mannitol; D002244:Carbon; D009609:Nitrous Oxide
keywords: Greenhouse effect; Mannitol; Nitrous oxide; Partial nitrification; Reduction