Abstract
The sewage sludge and the chemical composition of its ash were characterized experimentally. Mineral compounds of the ash were studied by X-ray microanalysis, X-ray diffraction, and IR spectroscopy. The fusion temperatures of the sewage sludge ash were determined by the cone method. The main parameters of the slag formation (base to acid ratio, slag viscosity index, and fouling index) were calculated. The ash contains large amounts of P2O5, CaO, SiO2, and Fe2O3. Thermodynamic calculations show that large amounts of Ca3(PO4)2 and CaSiO3, significant amount of Fe2O3, and small amounts of MgSiO3, Al2O3, and SiO2 are observed in the temperature interval 600–1400°С. The sewage sludge ash tends to slagging and fouling on the reactor walls.
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The study was financially supported by the Russian Foundation for Basic Research (research project no. 19-08-00244) and by government assignment no. 0089-2019-0018 (state registry no. АААА-А19-119-022690098-3).
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Tsvetkov, M.V., Podlesniy, D.N., Freyman, V.M. et al. Behavior of the Sewage Sludge Ash under the Conditions of High-Temperature Processing. Russ J Appl Chem 93, 881–887 (2020). https://doi.org/10.1134/S1070427220060154
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DOI: https://doi.org/10.1134/S1070427220060154