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In addition to the combustion of sewage sludge on its own (\u201cmono\u2010combustion\u201d), additions of different additives prior to the combustion step were also carried out. Based on the very positive effects of the additives sodium and potassium carbonate on the obtained ashes concerning their phosphate solubilities in neutral ammonium citrate (NAC) solution, sewage sludge combustions after additions of Na<jats:sub>2<\/jats:sub>CO<jats:sub>3<\/jats:sub> or K<jats:sub>2<\/jats:sub>CO<jats:sub>3<\/jats:sub> were investigated in detail. We found that these additions altered the main phosphate\u2010containing product found in the ashes from whitlockite (Ca<jats:sub>9<\/jats:sub>(Mg,Fe)(PO<jats:sub>3<\/jats:sub>OH)(PO<jats:sub>4<\/jats:sub>)<jats:sub>6<\/jats:sub>), a hardly plant\u2010accessible species, to other phosphate containing compounds such as buchwaldite (CaNaPO<jats:sub>4<\/jats:sub>), which is known for a long time as a very good P\u2013source for plants. Consecutive greenhouse experiments with maize (<jats:italic>Zea mays<\/jats:italic> L.) as test plant confirmed the results of the chemical analyses and demonstrated that Na\u2010 or K\u2010ashes obtained from a \u201cco\u2010combustion\u201d of sewage sludge mixed with alkali carbonates exhibit relative P\u2010fertilising efficiencies of up to ~80\u2009% in comparison to commercial superphosphate, making these materials promising surrogate phosphate mineral sources for agricultural production.<\/jats:p>","DOI":"10.1002\/cssc.202401744","type":"journal-article","created":{"date-parts":[[2024,11,11]],"date-time":"2024-11-11T05:58:23Z","timestamp":1731304703000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Enhancement of the Plant\u2010Accessible Phosphate Fraction in Sewage Sludge Ashes by Na<sup>+<\/sup> or K<sup>+<\/sup> Addition Prior to Combustion"],"prefix":"10.1002","volume":"18","author":[{"ORCID":"https:\/\/orcid.org\/0009-0000-1748-3051","authenticated-orcid":false,"given":"Lorenz","family":"Bier\u2010Schorr","sequence":"first","affiliation":[{"name":"Institute for Inorganic and Analytical Chemistry (IAAC) \/ Freiburg Materials Research Center (FMF) University of Freiburg  Albertstra\u00dfe 21 79104 Freiburg Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Viktoria","family":"Gr\u00e4ser","sequence":"additional","affiliation":[{"name":"Faculty for Biology, Chair of Geobotany University of Freiburg  Sch\u00e4nzlestra\u00dfe 1 79104 Freiburg Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9566-590X","authenticated-orcid":false,"given":"Michael","family":"Scherer\u2010Lorenzen","sequence":"additional","affiliation":[{"name":"Faculty for Biology, Chair of Geobotany University of Freiburg  Sch\u00e4nzlestra\u00dfe 1 79104 Freiburg Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5268-8917","authenticated-orcid":false,"given":"Peter","family":"Hajek","sequence":"additional","affiliation":[{"name":"Faculty for Biology, Chair of Geobotany University of Freiburg  Sch\u00e4nzlestra\u00dfe 1 79104 Freiburg Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6362-1774","authenticated-orcid":false,"given":"Philipp","family":"Kurz","sequence":"additional","affiliation":[{"name":"Institute for Inorganic and Analytical Chemistry (IAAC) \/ Freiburg Materials Research Center (FMF) University of Freiburg  Albertstra\u00dfe 21 79104 Freiburg Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2024,11,26]]},"reference":[{"key":"e_1_2_8_1_1","unstructured":"European Commission \u201c2017 list of Critical Raw Materials for the EU\u201d 2017 can be found underhttps:\/\/www.eur-lex.europa.eu\/legal-content\/EN\/TXT\/?uri=CELEX:52017DC0490(accessed: 26.\u200903.\u20092024)."},{"key":"e_1_2_8_2_1","unstructured":"U.\u2005S. 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