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Study of the mechanism of adsorption wastewater treatment from surfactants by modified energy waste to reduce anthropogenic impact on the environment

R.Ya. Iskhakova, L.A. Nikolaeva

Section: Ecologization of industry

The article presents the results of a study of the anionic synthetic surfactants adsorption by energy waste – carbonate sludge from water treatment of thermal power plants, modified by a binding material – paraffin-modified sludge (PMS). Paraffin wax was used as a binding component; it is hydrophobic, insolubil, and has sorption capacity for the absorbed surfactants. It was experimentally established that introduction of the binding component in an amount of 30 wt. % is the most appropriate.The sorption capacity of PMS is 22.1 mg/g. The adsorption isotherm belongs to type I according to the Brunauer, Emmett, and Teller classification, which indicates monomolecular adsorption. The constants of adsorption equilibrium, isosteric heats of adsorption were calculated based on Langmuir isotherms. The values of Gibbs free energy were calculated using the Gibbs-Helholtz equation. It was found that the process occurs spontaneously. The main thermodynamic characteristics of the adsorption process were determined, based on which it was established that physical adsorption occurs on the obtained sorption material due to Van der Waals forces. To study the adsorption mechanism on PMS, an experimental determination of kinetic dependencies was carried out. The adsorption of sodium dodecyl sulfate (SDS) by PMS is realized by 80–90 % in the first 40–50 minutes. The activation energy of adsorption is 7.64 kJ/mol. The obtained research results can be used to develop the adsorption wastewater treatment technology in industrial enterprises. The environmentally safe proposed technology involves energy waste as secondary material resources and reduces the anthropogenic load on the environment.

Keywords: wastewater treatment, adsorption, industrial waste, anionic surfactants, thermodynamic characteristics

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Article published in number 2 for 2026
DOI: 10.25750/1995-4301-2026-2-145-155

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