Abstract
An overview of the use of ash wastes from a combined heat and power (CHP) plant as secondary resources in various areas of industry and agriculture is given. The physicochemical and sorption properties of ash and slag from the Apatity CHP plant with respect to the \({\text{NH}}_{4}^{ + }\) ion were studied. It was established that the process of sorption is adequately described by the Langmuir equation of monomolecular adsorption. The capacity of an adsorption monolayer of the ash and slag of 20.43 mg \({\text{NH}}_{4}^{ + }\)/g, which is consistent with the values noted in international practice, and the adsorption equilibrium constant (0.0632 L/g) were calculated. It was shown that the sorption process is most accurately described by a pseudo-second-order kinetic model, and it proceeds in a mixed-diffusion mode involving not only the outer surface of the material but also the inner surface of its particles due to their porosity.
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Translated by V. Makhlyarchuk
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Gorbacheva, T.T., Maiorov, D.V. Sorption of Ammonium Ions from Aqueous Solutions on the Ash and Slag of a CHP Plant. Solid Fuel Chem. 56, 276–284 (2022). https://doi.org/10.3103/S0361521922040048
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DOI: https://doi.org/10.3103/S0361521922040048