title: Efficiency promotion and its mechanisms of simultaneous nitrogen and phosphorus removal in stormwater biofilters.
abstract: Stromwater biofilter technology was greatly improved through adding iron-rich soil, plant detritus and eutrophic lake sediment. Significant ammonium and phosphate removal efficiencies (over 95%) in treatments with iron-rich soil were attributed to strong adsorption capability resulting in high available phosphorus (P) in media, supporting the abundance and activity of nitrifiers and denitrifiers as well as shaping compositions, which facilitated nitrogen (N) removal. Aquatic and terrestrial plant detritus was more beneficial to nitrification and denitrification by stimulating the abundance and activity of nitrifiers and denitrifiers respectively, which increased total nitrogen (TN) removal efficiencies by 17.6% and 22.5%. In addition, bioaugmentation of nitrifiers and denitrifiers from eutrophic sediment was helpful to nutrient removal. Above all, combined application of these materials could reach simultaneously maximum effects (removal efficiencies of P, ammonium and TN were 97-99%, 95-97% and 60-63% respectively), suggesting reasonable selection of materials has important contribution and application prospect in stormwater biofilters.
authors.affiliation: The State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, PR China; University of Chinese Academy of Sciences, Beijing 100039, PR China.
authors.forename: Zijun
authors.initials: Z
authors.lastname: Zhou
authors.affiliation: College of Resources and Environment, Huazhong Agriculture University, Wuhan 430070, PR China.
authors.forename: Peng
authors.initials: P
authors.lastname: Xu
authors.affiliation: The State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, PR China.
authors.forename: Xiuyun
authors.initials: X
authors.lastname: Cao
authors.affiliation: The State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, PR China.
authors.forename: Yiyong
authors.initials: Y
authors.lastname: Zhou
authors.affiliation: The State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, PR China. Electronic address: clsong@ihb.ac.cn.
authors.forename: Chunlei
authors.initials: C
authors.lastname: Song
mesh_terms: D000327:Adsorption; D001673:Biodegradation, Environmental; D058440:Denitrification; D019015:Geologic Sediments / Q000737:chemistry*; D060106:Lakes / Q000737:chemistry*; D009584:Nitrogen / Q000032:analysis / Q000737:chemistry / Q000302:isolation & purification; D010758:Phosphorus / Q000032:analysis / Q000737:chemistry / Q000302:isolation & purification
chemical_list: D010758:Phosphorus; D009584:Nitrogen
keywords: Bioaugmentation; Denitrifiers; Iron-rich soil; Nitrifiers; Plant detritus