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Article

Extraction and Purification of Phosphorus from the Ashes of Incinerated Biological Sewage Sludge

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Department of Chemistry, University of Pavia, Viale Taramelli 10, 27100 Pavia, Italy
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Department of Civil, Environmental, Architectural Engineering and Mathematics, University of Brescia, Via Branze 43, 25123 Brescia, Italy
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Laboratory of Chemical and Environmental Technology, Department of Chemistry, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
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Department of Civil Engineering and Architecture, University of Pavia, Via Ferrata 3, 27100 Pavia, Italy
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Interdepartmental Centre for Water Research, University of Pavia, Via Ferrata 3, 27100 Pavia, Italy
*
Author to whom correspondence should be addressed.
Academic Editor: Christos S. Akratos
Water 2021, 13(8), 1102; https://doi.org/10.3390/w13081102
Received: 29 March 2021 / Revised: 11 April 2021 / Accepted: 13 April 2021 / Published: 16 April 2021
Phosphorus depletion represents a significant problem. Ash of incinerated biological sewage sludge (BSS) contains P, but the presence of heavy metals (e.g., Fe and Al) is the main issue. Based on chemical characterization by SEM-EDS, ED-XRF and ICP-OES techniques, the characteristics and P content of bottom ash (BA) and fly ash (FA) of incinerated BSS were very similar. On BA, P extraction carried out in counter- current with an S:L ratio of 1:10 and H2SO4 0.5 M led to better extraction yields than those of a similar test with H2SO4 1 M and an S:L ratio of 1:5 (93% vs. 86%). Comparing yields with H2SO4 0.5 M (S:L ratio of 1:10), the counter-current method gave better results than those of the crossflow method (93% vs. 83.9%), also improving the performance obtained with HCl in crossflow (93% vs. 89.3%). The results suggest that the purification of the acid extract from heavy metals with pH variation was impractical due to metal precipitation as phosphates. Extraction with H2SO4 and subsequent treatment with isoamyl alcohol represented the best option to extract and purify P, leading to 81% extraction yields of P with low amounts of metals. View Full-Text
Keywords: phosphorus recovery; sewage sludge; circular economy; acid extraction phosphorus recovery; sewage sludge; circular economy; acid extraction
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MDPI and ACS Style

Baldi, M.; Martinotti, A.; Sorlini, S.; Katsoyiannis, I.A.; Abbà, A.; Carnevale Miino, M.; Collivignarelli, M.C. Extraction and Purification of Phosphorus from the Ashes of Incinerated Biological Sewage Sludge. Water 2021, 13, 1102. https://doi.org/10.3390/w13081102

AMA Style

Baldi M, Martinotti A, Sorlini S, Katsoyiannis IA, Abbà A, Carnevale Miino M, Collivignarelli MC. Extraction and Purification of Phosphorus from the Ashes of Incinerated Biological Sewage Sludge. Water. 2021; 13(8):1102. https://doi.org/10.3390/w13081102

Chicago/Turabian Style

Baldi, Marco; Martinotti, Andrea; Sorlini, Sabrina; Katsoyiannis, Ioannis A.; Abbà, Alessandro; Carnevale Miino, Marco; Collivignarelli, Maria C. 2021. "Extraction and Purification of Phosphorus from the Ashes of Incinerated Biological Sewage Sludge" Water 13, no. 8: 1102. https://doi.org/10.3390/w13081102

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