期刊
JOURNAL OF ENVIRONMENTAL MANAGEMENT
卷 201, 期 -, 页码 260-267出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jenvman.2017.06.057
关键词
Adsorption thermodynamics; Adsorption kinetics; Anaerobic digestate treatment; Bio-waste materials; Nutrients recovery
资金
- project of Research Fund for International Young Scientist [51650110489]
- Beijing Science and Technology Council Funds [Z151100001115010]
- National Key Technology RD Program [2015BAD211304]
- Beijing Nova Program [2015B083]
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 (PO43--P) from anaerobically digested liquid swine manure. The PO43--P adsorption capacity increased followed by initial concentrations increasing. Maximum PO43--P adsorptions at initial 150 mg/L of PO43--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 PO43--P adsorption, which indicated the chemisorption via precipitation was the main mechanism for PO43--P removal. The sorption process was reversible and the adsorbed PO43--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 PO43--P of 150 mg/L. The present finding implied biochar could be effectively used to recover PO43--P from anaerobic digestate. (C) 2017 Elsevier Ltd. All rights reserved.
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