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Article

Application of Magnesium Modified Corn Biochar for Phosphorus Removal and Recovery from Swine Wastewater

Key Laboratory of Plant-Soil Interactions of Ministry of Education, College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China
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Int. J. Environ. Res. Public Health 2014, 11(9), 9217-9237; https://doi.org/10.3390/ijerph110909217
Received: 24 June 2014 / Revised: 1 August 2014 / Accepted: 27 August 2014 / Published: 5 September 2014
(This article belongs to the Special Issue Nutrient Removal and Recovery)
The 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
Keywords: phosphorus; magnesium modified corn biochar; swine wastewater; nutrient recovery phosphorus; magnesium modified corn biochar; swine wastewater; nutrient recovery
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MDPI and ACS Style

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. https://doi.org/10.3390/ijerph110909217

AMA Style

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. https://doi.org/10.3390/ijerph110909217

Chicago/Turabian Style

Fang, Ci, Tao Zhang, Ping Li, Rong-feng Jiang, and Ying-cai Wang. 2014. "Application of Magnesium Modified Corn Biochar for Phosphorus Removal and Recovery from Swine Wastewater" International Journal of Environmental Research and Public Health 11, no. 9: 9217-9237. https://doi.org/10.3390/ijerph110909217

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