title: Biological nutrient removal in a sequencing batch reactor operated as oxic/anoxic/extended-idle regime.
abstract: Previous researches have demonstrated that biological phosphorus removal from wastewater could be induced by oxic/extended-idle (O/EI) regime. In this study, an anoxic period was introduced after the aeration to realize biological nutrient removal. High nitrite accumulation ratio and polyhydroxyalkanoates biosynthesis were obtained in the aeration and biological nutrient removal could be well achieved in oxic/anoxic/extended-idle (O/A/EI) regime for the wastewater used. In addition, nitrogen and phosphorus removal performance in O/A/EI regime was compared with that in conventional anaerobic/anoxic/aerobic (A(2)/O) and O/EI processes. The results showed that O/A/EI regime exhibited higher nitrogen and phosphorus removal than A(2)/O and O/EI processes. More ammonium oxidizing bacteria and polyphosphate accumulating organisms and less glycogen accumulating organisms containing in the biomass might be the principal reason for the better nitrogen and phosphorus removal in O/A/EI regime. Furthermore, biological nutrient removal with O/A/EI regime was demonstrated with municipal wastewater. The average TN, SOP and COD removal efficiencies were 93%, 95% and 87%, respectively.
authors.affiliation: College of Environmental Science and Engineering, Hunan University, Changsha 410082, China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, China.
authors.forename: Xiao-ming
authors.initials: XM
authors.lastname: Li
authors.affiliation: College of Environmental Science and Engineering, Hunan University, Changsha 410082, China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, China.
authors.forename: Hong-bo
authors.initials: HB
authors.lastname: Chen
authors.affiliation: College of Environmental Science and Engineering, Hunan University, Changsha 410082, China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, China. Electronic address: yangqi@hnu.edu.cn.
authors.forename: Qi
authors.initials: Q
authors.lastname: Yang
authors.affiliation: College of Environmental Science and Engineering, Hunan University, Changsha 410082, China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, China. Electronic address: w.dongbo@yahoo.com.
authors.forename: Dong-bo
authors.initials: DB
authors.lastname: Wang
authors.affiliation: College of Environmental Science and Engineering, Hunan University, Changsha 410082, China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, China; Department of Bioengineering and Environment Science, Changsha University, Changsha 410003, China.
authors.forename: Kun
authors.initials: K
authors.lastname: Luo
authors.affiliation: College of Environmental Science and Engineering, Hunan University, Changsha 410082, China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, China.
authors.forename: Guang-ming
authors.initials: GM
authors.lastname: Zeng
mesh_terms: D001419:Bacteria / Q000201:enzymology / Q000302:isolation & purification; D058491:Bacterial Load; D001426:Bacterial Proteins / Q000378:metabolism; D019149:Bioreactors / Q000382:microbiology; D009584:Nitrogen / Q000378:metabolism*; D010100:Oxygen / Q000032:analysis*; D010758:Phosphorus / Q000378:metabolism*; D014865:Waste Disposal, Fluid; D014874:Water Pollutants, Chemical / Q000378:metabolism*
chemical_list: D001426:Bacterial Proteins; D014874:Water Pollutants, Chemical; D010758:Phosphorus; D009584:Nitrogen; D010100:Oxygen
keywords: Biological nutrient removal; Denitrification; Enhanced biological phosphorus removal; Oxic/anoxic/extended-idle regime; Polyhydroxyalkanoates