Phosphate recovery from livestock wastewater using iron oxide nanotubes

作者：Kim Minseok^*; Park Kibum; Kim Jung Moo

来源：Chemical Engineering Research and Design, 2016, 114: 119-128.

DOI：10.1016/j.cherd.2016.06.016

• Phosphate
• Iron oxide nanotubes
• Livestock wastewater
• Self-organized
• Anodizing

The key parts of this study included the fabrication of self-organized cylindrical nanotubes on the surface of iron (Fe) foil through anodization and the experimental evaluation of the adsorption and desorption performance of iron oxide nanotubes (INTs) for phosphate recovery with synthetic wastewater and raw livestock wastewater. Nanostructured INTs were achieved more than 95% of phosphate adsorption and desorption from synthetic wastewater in 30 min whereas pure Fe foil showed only less than 40% of phosphate adsorption in 60 min. Also, the INTs maintained the high efficiency of adsorption and desorption through three cycles of consecutive adsorption and desorption with the same INTs. In the case of raw livestock wastewater, the INTs adsorbed 43% of phosphate in 60 min in a continuous column experiment. The Freundlich isotherm model was more suitable than the Langmuir model for describing phosphate isotherms on INTs. Based on results of point of zero charge, the adsorption of phosphate was more effective in the acidic range of pH. For phosphate recovery using INTs, an additional recovery step to separate iron particles from treated wastewater is not necessary, which indicates that this method has great advantages for saving the operating cost in actual application.

• 出版日期2016-10