Phosphorus speciation in sewage sludge and their ashes after incineration as a function of treatment processes.

ABSTRACT: Phosphorus (P) is a key component in agricultural fertilizers, but it is also a scarce resource, why its recycling has been thoroughly investigated and one promising resources is sewage sludge. Because of stricter regulations in terms of sludge disposal, thermal treatment (e.g. incineration) has become an attractive option. The incineration process alters the chemical speciation of P in favour to calcium-associated (apatite, apatite phosphorus (AP)) species, which is preferred for P recovery. In order to achieve qualitatively transformation, it is important to identify limiting or promoting factors. This study reports on the impact of iron, aluminium and calcium on the transformation of iron- and aluminium-phosphate (NAIP) to AP species, assessed by studying sludge and ash from 10 municipa

SUBMITTER: Nilsson C 

PROVIDER: S-EPMC11874579 | biostudies-literature | 2025 Mar

REPOSITORIES: biostudies-literature