The paper describes the issues associated with waste generated during steel production and processing, in particular the dust from electric arc furnaces (EAF). An effective solution for the disposal of such waste is its involvement in processing to obtain valuable products. This paper studies the physical and chemical properties of EAF dust produced during the smelting of metallized pellets and captured by the dust and gas cleaning system of the steel-smelting shop at the Oskol Electrometallurgical Combine, Belgorod Region. The results obtained in the study of the chemical and disperse compositions of dust, the microstructure of the surface made it possible to propose the use of dust as a raw material for coagulant production. The conditions of acid-thermal treatment of dust are determined, contributing to the partial dissolution of iron (II), (III), and aluminium compounds, which ensure the coagulation processes during wastewater treatment. Model solutions show high efficiency (> 95 %) of water treatment from heavy metal ions by modified EAF dust.
A review of the literature data on the use of biomass components of apricot trees (Prunusarmeniaca) as a sorption material for the extraction of various pollutants from waste and natural waters is carried out. The parameters of the sorption interaction at which the highest degree of removal of pollutants is achieved are given. It has been shown that it is possible to increase the sorption capacity of apricot biomass components by modifying it with various chemical reagents. It has been determined that the most studied sorption material is the shell of apricot kernels. It is determined that the largest number of publications is devoted to the use of the latter as raw materials for the production of activated carbons. It was revealed that the surface area and the total pore volume of activated carbons from the kernels of apricot fruits depend on the modes of carbonization and activation of raw materials. It is shown that activated carbons are effective sorbents for removing various pollutants (metal ions, dyes, oil and oil products) from aqueous media. It was found that the adsorption isotherms of pollutants are most adequately described in most cases by the Langmuir and Freundlich models, and the kinetics of the process is most often described by the pseudo-second order model.
The paper deals with a study of Zn2+ ions adsorption by native and modified fine-cut pea (Pisumsativum) pod shells. The sorption material under study was treated using 1%, 2% and 3% NaOH or H2SO4 solutions. Isotherms of Zn2+ ions adsorption by native and treated pea pod shells were plotted and calculated using the Langmuir, Freundlich, Tyomkin, and Dubinin-Radushkevich models. It was determined that the isotherm of zinc ions adsorption by native shells of pea pods is most accurately described by the Langmuir model, by modified shells – by the Freundlich model. According to the values of the adsorption energy and the Gibbs energy, the adsorption is a physical process. The paper provides data on the degree of crystallinity, elemental analysis, and IR spectra of native and treated pea pods.
The literature data on the use of biomass and waste from the processing of melons (pumpkin, watermelon, melon, cucumber) as sorption materials for various pollutants removing from aquatic environments are summarized. It was determined that dried shells of melons and gourds are effective sorption materials for the extraction of heavy metal ions and dyes. The seeds of large fruits of melons (pumpkin, watermelon, melon), as well as their shells, also showed good sorption performance for heavy metal ions and dyes. It was revealed that most of the isotherms of the adsorption of pollutants on the processing of melons and gourds waste are most accurately described by the Langmuir model, less often by the Freundlich model, singularly by the Temkin or Dubinin-Radushkevich models. It is determined that the process kinetics in all cases follows the pseudo-second order model. To increase the adsorption characteristics of the components of melons and gourds for various pollutants, the materials were modified with various chemical reagents.
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