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Phosphorus speciation in sewage sludge from three municipal wastewater treatment plants in Sweden and their ashes after incineration
Örebro University, School of Science and Technology. Fortum Waste Solutions AB, Kumla, Sweden. (MTM Research Centre)ORCID iD: 0000-0003-2962-6587
Örebro University, School of Science and Technology. (MTM Research Centre)ORCID iD: 0000-0001-7845-6495
Örebro University, Örebro, Sweden. (MTM Research Centre)
Örebro University, School of Science and Technology. (MTM Research Centre)ORCID iD: 0000-0001-9960-0070
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2022 (English)In: Waste Management & Research, ISSN 0734-242X, E-ISSN 1096-3669, Vol. 40, no 8, p. 1267-1276, article id 734242X211065231Article in journal (Refereed) Published
Abstract [en]

Given the high efficiency in phosphorus removal at municipal wastewater treatment plants (MMWWTP), sewage sludge constitutes a promising resource for phosphorus (P) recovery. Sewage sludge is, however, a complex matrix and its direct use as fertiliser is limited by its content of metals/metalloids and organic pollutants. In order to increase its usability as a potential resource of P, there is a need for increased knowledge on phosphorus speciation in these matrices. The sludge composition is highly influenced by local conditions (i.e. wastewater composition and treatment method), and it is therefore important to study sludge from several MMWWTPs. In this study, three different protocols for sequential extraction were utilised to investigate the chemical speciation of phosphorus in sludge from three different MMWWTP sludges in Sweden, as well as in corresponding ashes following incineration. The results showed that the total amounts of phosphorus ranged from 26 to 32 mg g-1 sludge (dry weight), of which 79-94% was inorganically bound (IP). In the sludge, 21-30% of the IP was associated with calcium (Ca-P), which is the preferred species for fertiliser production. Following incineration, this fraction increased to 54-56%, mainly due to transformation of iron-associated phosphorus (Fe-P), while aluminium-associated species of phosphorus (Al-P) remained unaltered. The results from this study confirm that incineration is a suitable treatment for sewage sludge in terms of potential phosphorus recovery.

Place, publisher, year, edition, pages
Sage Publications, 2022. Vol. 40, no 8, p. 1267-1276, article id 734242X211065231
Keywords [en]
Sewage sludge, bioavailability, incineration, phosphorus, recirculation, speciation, sustainability, wastewater
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:oru:diva-96079DOI: 10.1177/0734242X211065231ISI: 000736222100001PubMedID: 34920692Scopus ID: 2-s2.0-85121694485OAI: oai:DiVA.org:oru-96079DiVA, id: diva2:1621965
Note

Funding agency:

Norrtorp Kumla Environmental foundation

Available from: 2021-12-21 Created: 2021-12-21 Last updated: 2022-09-12Bibliographically approved

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Nilsson, CharlotteSjöberg, ViktorKarlsson, StefanAllard, B.

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