Influence of Ca addition and calcining parameters on phosphorus compounds recovery from sewage sludge ash / Katarzyna Gorazda, Zbigniew Wzorek, Anna Puda-Skowron // W: Chemistry and biochemistry in the ... więcej

Influence of Ca addition and calcining parameters on phosphorus compounds recovery from sewage sludge ash / Katarzyna Gorazda, Zbigniew Wzorek, Anna Puda-Skowron // W: Chemistry and biochemistry in the agricultural production, envinronment protection, human and animal health / ed. by Henryk Górecki, Zbigniew Dobrzański, Paweł Kafarski. – Jesenik : Czech-Pol Trade, 2006. – (Chemistry for Agriculture ; Vol. 7). – S. 718-723 : rys., tab. – Bibliogr. 6 poz., Streszcz. ang. – ISBN 80-239-7759-8

The goal of conducted research was determination of influence of alkali components on the hematite phase formation during thermal processing and the increase of phosphorus extraction selectivity in relation ... więcej

The goal of conducted research was determination of influence of alkali components on the hematite phase formation during thermal processing and the increase of phosphorus extraction selectivity in relation to Fe. The raw ash samples (Gdynia Ash from the sewage sludge thermal utilization plant at Municipal Sewage Treatment Plant in Gdynia) and mixtures of ash with CaO were calcined at temperature 600, 700, 800, 900, 9500C in muffle furnace then extracted for 4h with the use of 2.71 mol/dm3 HNO3. The presence of alkali components such as Ca influence the transformations that takes place during combustion processes, especially iron binding in the insoluble hematite phase Fe2O3 and formation of different connections between phosphorus, calcium and iron.