PHYSICAL AND CHEMICAL PROPERTIES OF SORBENTS USED FOR WASTEWATER PURIFICATION FROM OIL PRODUCTS

Abstract

The work is devoted to the study of the physico-chemical and adsorption properties of synthetic and natural sorbents contaminated with oil products. The parameters such as sorption capacity for petroleum products, water adsorption and moisture content, bulk density, as well as parameters characterizing the sorption equilibrium in the surface layers (distribution coefficients, maximum adsorption values, Henry constants, Gibbs energy changes, adsorption coefficients and filling degrees) were determined. Adsorption isotherms for all sorbents are almost identical in character with a pronounced linear region in the region of low concentrations of oil products and correspond to isotherms of monomolecular adsorption. The sorption capacity of the sorbents under study varies from 10 to 50 mg of oil products per 1 g of sorbent. The maximum sorption capacity among the sorbents studied the Ol-Ex Hard possesses. This sorbent belongs to sorbents of the silicate group and Ol-Ex 82, based on polyurethane. The lowest moisture content is also characteristic for silicate sorbents and does not exceed 0.5 % of their mass. The maximum moisture adsorption is typical for sorbents of SONET Sorb and MGS Sorb. It was revealed that the surface of Ol-Ex Hard is almost completely filled with oil (q → 1), while for shungite the surface will be filled only by 13%. The most effective for trapping oil products should be considered the sorbent Ol-Ex Hard, for which the highest values of adsorption parameters are characteristic.Forcitation:Gusev G.I., Gushchin A.A., Filippov D.V., Grinevich V.I., Izvekova T.V. Physical and chemical properties of sorbents used for wastewater purification from oil products. Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2018. V. 61. N 7. P. 136-142