The development of drilling waste recycling technologies is a crucial task, primarily due to their negative impact on the environment, the increasing need for state control over compliance with environmental legislation by oil production companies, and the absence of universal technological solutions for their recycling and neutralization. This article provides a brief overview of various methods to recycle drilling waste for the production of different materials. Using drilling waste located in the Tyumen region as an example, the study demonstrates the potential of incorporating them as additives in fine-grained concrete.

This study investigates the impact of a binary filler on the physicomechanical and tribological properties, as well as structure, of polymeric composite materials based on ultra-high-molecular-weight polyethylene. The organic modifier—2-mercaptobenzothiazole and wollastonite particles synthesized from two different systems (modeled and derived from waste) were used as the binary filler. The synthesis of wollastonite was carried out in the complex model system (CaSO4·2H2O–SiO2·nH2O–KOH–H2O) and from technogenic waste (borogypsum). It was demonstrated that the introduction of the binary filler made it possible to obtain an optimal combination of mechanical and tribological properties. It was found that during the wear of polymeric composite materials loaded with organic fillers, the fillers migrate to the friction surface, providing a shield against abrasive wear of the steel counterface. Due to the modification of ultra-high-molecular-weight polyethylene by 2-mercaptobenzothiazole, the interdiffusion of polymeric matrix macromolecules and interphase coupling with wollastonite particles improve. The 2-mercaptobenzothiazole organic compound used as the filler facilitates the relaxation processes within the composite under external loads.

Data on the sorption characteristics of synthetic X-ray amorphous calcium silicate obtained in the CaCl 2 –Na 2 SiO 3 –H 2 O model multicomponent system are presented. The isotherms of sorption of Sr 2+ ions from aqueous solutions without supporting salt at Sr 2+ concentrations of 0.016 to 1.22 mmol/L at temperatures of 20, 40 and 60°C and the solid to liquid phase ratio S : L = 1 : 400 are presented. The maximum sorption capacities of synthetic X-ray amorphous calcium silicate and the recoveries of Sr 2+ ions were determined for various S : L ratios and for solutions containing no supporting salt and solutions mimicking the specific composition of fresh water. The Sr 2+ sorption kinetics at various temperatures was studied for the first time; and the activation energy of sorption was determined. The results can be used to develop practical recommendations for the production of this material and application in the processes of strontium sorption and immobilization.

In the present work, the results of study of the composition, microstructure, and strength properties of composite coatings based on titanium and titanium carbide obtained using two different surface treatment methods-electric arc method in an electrolyte and laser method-are presented. It is shown that the coating parameters affecting the strength properties of samples, such as the morphology and size of carbide grains in the coating composition along with the coating thickness, are significantly easier to adjust using the laser cladding method.

This article presents data on the contents of Fe, Mn, Cu, Zn, Ni, Pb, and Cd in the tissues of the tunic, muscular sac, stomach, digestive gland, and gonads of the ascidian Halocynthia aurantium Pallas, 1787 from Peter the Great Bay and Kievka Bay (Sea of Japan). The physiologically important elements Fe, Mn, and Zn prevailed in almost all organs of ascidians in terms of their concentration levels. Patterns of metal distribution in the organs and tissues of H. aurantium were determined depending on their age. The levels of content of Zn, Mn, and Cu were similar in the organs of 2- and 3-year-old individuals. The element concentrations were highest in the digestive gland (Zn), stomach (Zn, Cu), tunic (Mn), and gonads (Cu). The content of Mn in the tunic of H. aurantium from different biotopes was higher compared to other organs. The content of Pb in the tissues of H. aurantium from Kievka Bay was higher than that of the tissues of ascidians from the other studied localities.

This work reports the main findings of the studies related to the problem of liquid radioactive waste utilization conducted at the Institute of Chemistry, Far Eastern Branch, Russian Academy of Sciences, in 2013–2018. It has been shown that, during the electrochemical treatment of model aqueous solutions containing Co-EDTA, the complex is destroyed and cobalt precipitates in the form of oxides, hydroxides, and spinel of variable compositions.

The activity of microorganisms is a decisive factor in the transformation of the essential and, at the same time, toxic selenium (Se) in marine waters. This review provides an analysis of the literature data on the microbiological regulation of the state of Se in marine waters: the role of microorganisms in eliminating toxic Se from marine waters through precipitation of reduced Se forms and in the reverse process, transformation of Se into a form available to be taken up by organisms and involvement of this element in the biogeochemical cycle. The processes of transformation of the oxidized and reduced Se forms with the participation of microorganisms in marine waters are considered. It has been shown that in anaerobic conditions bacteria use the oxidized Se forms as electron acceptors (reduction). Bioavailable selenite and selenate ions are formed in the case of aerobic oxidation. Biotransformation of dissolved Se is a key mechanism for the formation of methylated gaseous Se forms in marine waters as one of the ways to remove this element from the aquatic environment.