Regeneration of natural sorbents contaminated with oil products in dielectric barrier discharge plasma

Abstract

The work is devoted to the study of the recovery processes of the sorption properties of diatomite contaminated with oil products (NP) when it is processed in a dielectric barrier discharge (DBD). Dependences of the sorption capacity on the initial concentration of petroleum products (PP) for the three types of sorbents (diatomite, schungite, zeolite) were determined and working ranges of PP concentrations for the investigated sorbents were established. It was shown that pretreatment of uncontaminated diatomite in DBP led to an increase in its sorption capacity, i.e. there was an "activation" of the sorbent, associated with a change in the properties of its surface, namely, with an increase in the surface of the active centers. The maximum number of cycles of regeneration of the sorbent in DBD, under which it does not lose its physical properties, is eight cycles. Optimum parameters of treatment of contaminated PP diatomite in DBD were established: processing time - 1 min, flow rate of plasma forming gas - 1 l / min, power input into discharge - 8.9 W/cm3. After treatment of the sorbent in the plasma-chemical reactor under optimal conditions, the sorption capacity of diatomite increases by 2.4 times. Thus, based on the results of the conducted studies, it was revealed that when treating contaminated sorbents, the dielectric barrier discharge has a synergistic effect: activates the surface of the sorption material and leads to the destruction of oil products presenting in the sorbent, i.e. this method can be effectively used for the purification of environmentally objects polluted with oil.