title: Effects of pressurized aeration on organic degradation efficiency and bacterial community structure of activated sludge treating saline wastewater.
abstract: This study was aimed to investigate the effect of moderate pressure on organic matter removal efficiency and microbial population of activated sludge treating saline wastewater. The activated sludge was cultivated with a gradual increase of salt concentrations under gage pressure of 0.3MPa for 71days. Microbial diversities of activated sludge sampled in different stages of domestication were investigated by Illumina sequencing technology. Results showed that pressurized aeration could improve the treatment efficiency and the dehydrogenase activity (DHA) of activated sludge, especially at high salinity (35, 50gNaClL-1). Bacterial richness and community diversity of activated sludge in the pressurized reactor were significantly higher than those in the control reactor. Microbial population structures were quite different between the two reactors. More species originating from fresh wastewater biological treatment process would survive and remain in pressurized activated sludge.
authors.affiliation: School of the Environment, Nanjing Normal University, Nanjing 210023, China; Key Laboratory of Virtual Geographic Environment (Nanjing Normal University), Ministry of Education, Nanjing 210023, China; State Key Laboratory Cultivation Base of Geographical Environment Evolution (Jiangsu Province), Nanjing 210023, China; Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing 210023, China. Electronic address: zy@njnu.edu.cn.
authors.forename: Yong
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: Jiangsu Province Key Laboratory of Environmental Engineering, Nanjing 210000, China.
authors.forename: Bing
authors.initials: B
authors.lastname: Li
authors.affiliation: School of the Environment, Nanjing Normal University, Nanjing 210023, China.
authors.forename: Rui-Xiao
authors.initials: RX
authors.lastname: Xu
authors.affiliation: School of the Environment, Nanjing Normal University, Nanjing 210023, China.
authors.forename: Guo-Xiang
authors.initials: GX
authors.lastname: Wang
authors.affiliation: School of the Environment, Nanjing Normal University, Nanjing 210023, China.
authors.forename: Ying
authors.initials: Y
authors.lastname: Zhou
authors.affiliation: School of the Environment, Nanjing Normal University, Nanjing 210023, China.
authors.forename: Biao
authors.initials: B
authors.lastname: Xie
mesh_terms: D019149:Bioreactors / Q000382:microbiology*; D012722:Sewage / Q000382:microbiology*; D014865:Waste Disposal, Fluid / Q000379:methods*; D062065:Wastewater / Q000737:chemistry / Q000382:microbiology*
chemical_list: D012722:Sewage; D062065:Wastewater
keywords: Activated sludge; Dehydrogenase activity; Microbial population; Moderate pressure; Saline wastewater