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Phosphate recovery from liquid fraction of anaerobic digestate using four slow pyrolyzed biochars: Dynamics of adsorption, desorption and regeneration.
Journal of Environmental Management 2017 October 2
Four slow pyrolyzed biochars produced from wood (WDB), corncobs (CCB), rice husks (RHB) and sawdust (SDB) were evaluated for adsorption, desorption and regeneration of phosphate (PO4 3- -P) from anaerobically digested liquid swine manure. The PO4 3- -P adsorption capacity increased followed by initial concentrations increasing. Maximum PO4 3- -P adsorptions at initial 150 mg/L of PO4 3- -P (highest load) were average of 7.67, 6.43, 5.73 and 5.41 mg/g for WDB, CCB, RHB and SDB, respectively. Pseudo second order kinetics model could best fit PO4 3- -P adsorption, which indicated the chemisorption via precipitation was the main mechanism for PO4 3- -P removal. The sorption process was reversible and the adsorbed PO4 3- -P could be desorbed in both neutral (57-78%) and acidic solution environments (75-88%) for all biochars. Meanwhile, regenerated biochar could re-adsorb up to 5.62 mg/g at the highest initial PO4 3- -P of 150 mg/L. The present finding implied biochar could be effectively used to recover PO4 3- -P from anaerobic digestate.
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