title: Effect of phosphorus load on nutrients removal and N₂O emission during low-oxygen simultaneous nitrification and denitrification process.
abstract: Three laboratory scale anaerobic-aerobic (low-oxygen) SBRs (R1, R2 and R3) were conducted at different influent phosphorus concentration to evaluate the impacts of phosphorus load on nutrients removal and nitrous oxide (N₂O) emission during low-oxygen simultaneous nitrification and denitrification (SND) process. The results showed that TP and TN removals were enhanced simultaneously with the increase in phosphorus load. It was mainly caused by the enrichment of polyphosphate accumulating organisms (PAOs) under high phosphorus load and low COD/P ratio (<50), which could use nitrate/nitrite as electron acceptors to take up the phosphorus. N₂O emission was reduced with increasing phosphorus load. N₂O-N emission amount per cycle of R3 was 24.1% lower than that of R1. It was due to the decrease of N₂O yield by heterotrophic denitrification. When the phosphorus load increased from R1 to R3, heterotrophic denitrification (D) ranged from 42.6% to 36.6% of the N₂O yield.
authors.affiliation: Shandong Provincial Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Jinan 250100, China.
authors.forename: Wenlin
authors.initials: W
authors.lastname: Jia
authors.forename: Shuang
authors.initials: S
authors.lastname: Liang
authors.forename: Huu Hao
authors.initials: HH
authors.lastname: Ngo
authors.forename: Wenshan
authors.initials: W
authors.lastname: Guo
authors.forename: Jian
authors.initials: J
authors.lastname: Zhang
authors.forename: Rong
authors.initials: R
authors.lastname: Wang
authors.forename: Yina
authors.initials: Y
authors.lastname: Zou
mesh_terms: D058440:Denitrification; D009585:Nitrogen Dioxide / Q000032:analysis / Q000737:chemistry*; D010100:Oxygen / Q000032:analysis / Q000737:chemistry*; D010758:Phosphorus / Q000737:chemistry*; D062065:Wastewater / Q000737:chemistry; D018508:Water Purification / Q000379:methods*
chemical_list: D009585:Nitrogen Dioxide; D010100:Oxygen; D010758:Phosphorus; D062065:Wastewater