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Energy demand for phosphorus recovery from municipal wastewater
Mälardalen University, School of Business, Society and Engineering, Future Energy Center.ORCID iD: 0000-0002-9373-2774
Mälardalen University, School of Business, Society and Engineering, Future Energy Center.ORCID iD: 0000-0002-8034-4043
Mälardalen University, School of Business, Society and Engineering, Future Energy Center.ORCID iD: 0000-0002-3485-5440
2019 (English)In: Innovative Solutions for Energy Transitions / [ed] Elsevier, 2019, Vol. 158, p. 4338-4343Conference paper, Published paper (Refereed)
Abstract [en]

Phosphorus (P) is one of the essential nutrients for production of food. In modern agriculture, a large part of P comes from finite sources. There are several suggested processes for reuse of P from wastewater. In this paper, the energy use of direct reuse of sludge in agriculture is compared to the energy demand connected to use of mineral P and to reuse of P after thermal processing of sludge. The study is based on literature data from life cycle analysis (LCA). In the case of direct sludge reuse the sludge stabilization processes applied and the system boundaries of the LCA has a large impact on the calculated energy demand. The results though indicate that direct reuse of sludge in agriculture is the reuse scenario that potentially has the lowest energy demand (3-71 kWh/kg P), compared to incineration and extraction of P from sludge ashes (45-70 kWh/kg P) or pyrolysis of sludge (46-235 kWh/kg P). The competitiveness compared to mineral P (-4-22 kWh/kg P) depends on the mineral P source and production. For thermal processing, the energy demand derives mainly from energy needed to dry sludge and supplement fuel used during sludge incineration together with chemicals required to extract P. Local conditions, such as available waste heat for drying, can make one of these scenarios preferable.

Place, publisher, year, edition, pages
2019. Vol. 158, p. 4338-4343
Series
Energy Procedia
Keywords [en]
incineration; combustion; pyrolysis; wastewater sludge; nutrient reuse
National Category
Environmental Biotechnology
Research subject
Biotechnology/Chemical Engineering
Identifiers
URN: urn:nbn:se:mdh:diva-40395DOI: 10.1016/j.egypro.2019.01.787ISI: 000471031704107Scopus ID: 2-s2.0-85063882988OAI: oai:DiVA.org:mdh-40395DiVA, id: diva2:1240307
Conference
International Conference on Applied Energy, 2018
Available from: 2018-08-21 Created: 2018-08-21 Last updated: 2019-07-11Bibliographically approved

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Sylwan, IdaZambrano, JesusThorin, Eva

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