Application of Magnesium Modified Corn Biochar for Phosphorus Removal and Recovery from Swine Wastewater
AbstractThe recycling of lost phosphorus (P) is important in sustainable development. In line with this objective, biochar adsorption is a promising method of P recovery. Therefore, our study investigates the efficiency and selectivity of magnesium modified corn biochar (Mg/biochar) in relation to P adsorption. It also examines the available P derived from postsorption Mg/biochar. Mg/biochar is rich in magnesium nanoparticles and organic functional groups, and it can adsorb 90% of the equilibrium amount of P within 30 min. The Mg/biochar P adsorption process is mainly controlled by chemical action. The maximum P adsorption amount of Mg/biochar is 239 mg/g. The Langmuir-Freundlich model fits the P adsorption isotherm best. Thermodynamics calculation shows ∆H > 0, ∆G < 0, ∆S > 0, and it demonstrates the P adsorption process is an endothermic, spontaneous, and increasingly disordered. The optimal pH is 9. The amounts of P adsorbed by Mg/B300, Mg/B450, and Mg/B600 from swine wastewater are lower than that adsorbed from synthetic P wastewater by 6.6%, 4.8%, and 4.2%, respectively. Mg/biochar is more resistant to pH and to the influence of coexisting ions than biochar. Finally, postsorption Mg/biochar can release P persistently. The P release equilibrium concentrations are ordered as follows: Mg/B600 > Mg/B450 > Mg/B300. The postsorption Mg/B300, Mg/B450, and Mg/B600 can release 3.3%, 3.9%, and 4.4% of the total adsorbed P, respectively, per interval time. View Full-Text
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Fang, C.; Zhang, T.; Li, P.; Jiang, R.-F.; Wang, Y.-C. Application of Magnesium Modified Corn Biochar for Phosphorus Removal and Recovery from Swine Wastewater. Int. J. Environ. Res. Public Health 2014, 11, 9217-9237.
Fang C, Zhang T, Li P, Jiang R-F, Wang Y-C. Application of Magnesium Modified Corn Biochar for Phosphorus Removal and Recovery from Swine Wastewater. International Journal of Environmental Research and Public Health. 2014; 11(9):9217-9237.Chicago/Turabian Style
Fang, Ci; Zhang, Tao; Li, Ping; Jiang, Rong-feng; Wang, Ying-cai. 2014. "Application of Magnesium Modified Corn Biochar for Phosphorus Removal and Recovery from Swine Wastewater." Int. J. Environ. Res. Public Health 11, no. 9: 9217-9237.