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Jóźwiak T, Kowalkowska A, Filipkowska U, Struk-Sokołowska J, Bolozan L, Gache L, Ilie M. Recovery of phosphorus as soluble phosphates from aqueous solutions using chitosan hydrogel sorbents. Sci Rep 2021; 11:16766. [PMID: 34408258 PMCID: PMC8373865 DOI: 10.1038/s41598-021-96416-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2021] [Accepted: 08/10/2021] [Indexed: 11/20/2022] Open
Abstract
This manuscript presents new method of phosphorus recovery from aqueous solutions in a convenient form of readily-soluble phosphates using chitosan hydrogels. Non-modified chitosan hydrogel granules (CHs) and chitosan hydrogel granules crosslinked with epichlorohydrin (CHs-ECH) served as orthophosphate ion carriers. The developed method was based on cyclic sorption/desorption of orthophosphates, with desorption performed in each cycle to the same solution (the concentrate). The concentrations of orthophosphates obtained in the concentrates depended on, i.a., sorbent type, sorption pH, source solution concentration, and desorption pH. Phosphorus concentrations in the concentrates were even 30 times higher than these in the source solutions. The maximum concentrate concentrations reached 332.0 mg P-PO4/L for CHs and 971.6 mg P-PO4/L for CHs-ECH. The experimental series with CHs-ECH were characterized by higher concentrations of the obtained concentrate, however the concentrates were also more contaminated with Cl− and Na+ ions compared to series with CHs. The high content of chlorine and sodium ions in the concentrates was also favored by the low pH of sorption (pH < 4) and very high pH of desorption (pH > 12) in the cycles. After concentrate evaporation, phosphorus content in the sediment ranged from 17.81 to 19.83% for CHs and from 16.04 to 17.74% for CHs-ECH.
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Affiliation(s)
- Tomasz Jóźwiak
- Department of Environmental Engineering, University of Warmia and Mazury in Olsztyn, Warszawska St. 117a, 10-957, Olsztyn, Poland.
| | - Agata Kowalkowska
- Department of Environmental Engineering, University of Warmia and Mazury in Olsztyn, Warszawska St. 117a, 10-957, Olsztyn, Poland
| | - Urszula Filipkowska
- Department of Environmental Engineering, University of Warmia and Mazury in Olsztyn, Warszawska St. 117a, 10-957, Olsztyn, Poland
| | - Joanna Struk-Sokołowska
- Department of Environmental Engineering Technology, Bialystok University of Technology, Wiejska St. 45E, 15-351, Bialystok, Poland
| | - Ludmila Bolozan
- Faculty of Chemical Engineering and Environmental Protection, Gheorghe Asachi Technical University of Iaşi, Bulevardul Profesor Dimitrie Mangeron 67, 700050, Iaşi, Romania
| | - Luminita Gache
- Faculty of Chemical Engineering and Environmental Protection, Gheorghe Asachi Technical University of Iaşi, Bulevardul Profesor Dimitrie Mangeron 67, 700050, Iaşi, Romania
| | - Marius Ilie
- Faculty of Chemical Engineering and Environmental Protection, Gheorghe Asachi Technical University of Iaşi, Bulevardul Profesor Dimitrie Mangeron 67, 700050, Iaşi, Romania
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