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Application of magnesium modified corn biochar for phosphorus removal and recovery from swine wastewater.

Fang C, Zhang T, Li P, Jiang RF, Wang YC - Int J Environ Res Public Health (2014)

Bottom Line: 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 Article: PubMed Central - PubMed

Affiliation: Key Laboratory of Plant-Soil Interactions of Ministry of Education, College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China. fangci2012@163.com.

ABSTRACT
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.

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(a) P adsorption isotherm of Mg/B300 and B300; (b) P adsorption isotherm of Mg/B450 and B450; (c) P adsorption isotherm of Mg/B600 and B600.
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ijerph-11-09217-f004: (a) P adsorption isotherm of Mg/B300 and B300; (b) P adsorption isotherm of Mg/B450 and B450; (c) P adsorption isotherm of Mg/B600 and B600.

Mentions: The P adsorption isotherms of Mg/biochar and biochar were fitted to three adsorption isothermal models (Figure 4). Among these models, the Langmuir-Freundlich model was the one that best fit the P adsorption of both Mg/biochar and biochar. The maximum amounts of adsorbed P were 239 mg/g and 225 mg/g for Mg/biochar and bicohar, respectively. The maximum P adsorption amount of Mg/biochar was higher than that of biochar.


Application of magnesium modified corn biochar for phosphorus removal and recovery from swine wastewater.

Fang C, Zhang T, Li P, Jiang RF, Wang YC - Int J Environ Res Public Health (2014)

(a) P adsorption isotherm of Mg/B300 and B300; (b) P adsorption isotherm of Mg/B450 and B450; (c) P adsorption isotherm of Mg/B600 and B600.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4199016&req=5

ijerph-11-09217-f004: (a) P adsorption isotherm of Mg/B300 and B300; (b) P adsorption isotherm of Mg/B450 and B450; (c) P adsorption isotherm of Mg/B600 and B600.
Mentions: The P adsorption isotherms of Mg/biochar and biochar were fitted to three adsorption isothermal models (Figure 4). Among these models, the Langmuir-Freundlich model was the one that best fit the P adsorption of both Mg/biochar and biochar. The maximum amounts of adsorbed P were 239 mg/g and 225 mg/g for Mg/biochar and bicohar, respectively. The maximum P adsorption amount of Mg/biochar was higher than that of biochar.

Bottom Line: 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 Article: PubMed Central - PubMed

Affiliation: Key Laboratory of Plant-Soil Interactions of Ministry of Education, College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China. fangci2012@163.com.

ABSTRACT
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.

Show MeSH
Related in: MedlinePlus