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Shubiao Wu

Phosphorus recovery from biogas fermentation liquid by Ca-Mg loaded biochar

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  • Ci Fang, China Agricultural University
  • ,
  • Tao Zhang, China Agricultural University
  • ,
  • Ping Li, China Agricultural University
  • ,
  • Rongfeng Jiang, China Agricultural University
  • ,
  • Shubiao Wu
  • Haiyu Nie, China Agricultural University
  • ,
  • Yingcai Wang, China Agricultural University

Shortage in phosphorus (P) resources and P wastewater pollution is considered as a serious problem worldwide. The application of modified biochar for P recovery from wastewater and reuse of recovered P as agricultural fertilizer is a preferred process. This work aims to develop a calcium and magnesium loaded biochar (Ca-Mg/biochar) application for P recovery from biogas fermentation liquid. The physico-chemical characterization, adsorption efficiency, adsorption selectivity, and postsorption availability of Ca-Mg/biochar were investigated. The synthesized Ca-Mg/biochar was rich in organic functional groups and in CaO and MgO nanoparticles. With the increase in synthesis temperature, the yield decreased, C content increased, H content decreased, N content remained the same basically, and BET surface area increased. The P adsorption of Ca-Mg/biochar could be accelerated by nano-CaO and nano-MgO particles and reached equilibrium after 360. min. The process was endothermic, spontaneous, and showed an increase in the disorder of the solid-liquid interface. Moreover, it could be fitted by the Freundlich model. The maximum P adsorption amounts were 294.22, 315.33, and 326.63. mg/g. The P adsorption selectivity of Ca-Mg/biochar could not be significantly influenced by the typical pH level of biogas fermentation liquid. The nano-CaO and nano-MgO particles of Ca-Mg/biochar could reduce the negative interaction effects of coexisting ions. The P releasing amounts of postsorption Ca-Mg/biochar were in the order of Ca-Mg/B600. >. Ca-Mg/B450. >. Ca-Mg/B300. Results revealed that postsorption Ca-Mg/biochar can continually release P and is more suitable for an acid environment.

TidsskriftJournal of Environmental Sciences (China)
Sider (fra-til)106-114
Antal sider9
StatusUdgivet - 1 mar. 2015
Eksternt udgivetJa

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