title: Phototrophic periphyton techniques combine phosphorous removal and recovery for sustainable salt-soil zone.
abstract: The P (Pi as KH2PO4 and Po as ATP) removal processes by phototrophic periphyton were investigated by determining the removal kinetics, metal content (Ca, Mg, Al, Fe, Cu, and Zn) of the solution and P fractions (Labile-P, Fe/Al-P, Ca-P, and Res-P) within the periphyton. Results showed that the periphyton was able to remove completely both Pi and Po after 48h when periphyton content was greater than 0.2gL(-1) (dry weight). The difference between Pi and Po removal was the conversion of Po into Pi by the periphyton, after that the removal mechanism was similar. The P removal mechanism was mainly due to the adsorption on the surfaces of the periphyton, including two aspects: i) the adsorption of PO4(3-) onto metal salts such as calcium carbonate (~50%) and ii) complexation between PO4(3-) and metal cations such as Ca(2+) (~40%). However, this bio-adsorptional process was significantly influenced by the extracellular polymeric substance (EPS) of periphyton, water hardness, initial P concentration, temperature and light intensity. This study not only deepens the understanding of P biogeochemical process in aquatic ecosystem, but provides a potential biomaterial for combining phosphorous removal and recovery from non-point source wastewaters, especially around salt-soil zone.
authors.affiliation: Institute of Agro-Biotechnology, Jiangsu Academy of Agriculture Sciences, Nanjing 210014, PR China; State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, No. 71, East Beijing Rd, Nanjing 210008, PR China.
authors.forename: Haiying
authors.initials: H
authors.lastname: Lu
authors.affiliation: Institute of Agro-Biotechnology, Jiangsu Academy of Agriculture Sciences, Nanjing 210014, PR China.
authors.forename: Yanfang
authors.initials: Y
authors.lastname: Feng
authors.affiliation: State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, No. 71, East Beijing Rd, Nanjing 210008, PR China.
authors.forename: Yonghong
authors.initials: Y
authors.lastname: Wu
authors.affiliation: Institute of Agro-Biotechnology, Jiangsu Academy of Agriculture Sciences, Nanjing 210014, PR China. Electronic address: lzyang@issas.ac.cn.
authors.forename: Linzhang
authors.initials: L
authors.lastname: Yang
authors.affiliation: Institute of Agro-Biotechnology, Jiangsu Academy of Agriculture Sciences, Nanjing 210014, PR China; Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, PR China. Electronic address: shaohongbochu@126.com.
authors.forename: Hongbo
authors.initials: H
authors.lastname: Shao
mesh_terms: D000255:Adenosine Triphosphate / Q000032:analysis*; D000327:Adsorption; D001673:Biodegradation, Environmental; D018441:Biofilms / Q000254:growth & development; D007700:Kinetics; D000074284:Periphyton; D010710:Phosphates / Q000032:analysis*; D052817:Phototrophic Processes; D062065:Wastewater / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D000255:Adenosine Triphosphate; D010710:Phosphates; D062065:Wastewater; D014874:Water Pollutants, Chemical
keywords: Bioadsorption; Co-precipitation; P recovery; P removal mechanism; Periphyton