The study examines the specific features of using deep artesian groundwater contaminated with naturally occurring radionuclides for drinking water supply purposes. Existing methods for the removal of naturally occurring radionuclides from artesian water are reviewed, and the principal limitations of current technological approaches to integrated water treatment are discussed. The results of laboratory investigations of the composition of artesian groundwater sampled from deep wells in the Leningrad Region are presented. The findings of field-scale studies on the removal of naturally occurring radionuclides from artesian water using a pilot treatment unit operated under various conditions with different filtration media are reported. A novel practical approach is proposed for the design of rapidly deployable modular treatment systems intended for advanced integrated treatment of artesian groundwater from naturally occurring radionuclides and other dissolved contaminants through the use of shipping containers and filter cartridges.

Experimental and field studies of the carbonation of processed kimberlite from the Internationalnaya kimberlite pipe were carried out. The reasons for the absence of carbon dioxide uptake in the tailings storage facility, despite the high sequestration capacity of the material under laboratory conditions, were identified. A separate deposition strategy for ore-processing tailings and sand fractions within the tailings storage facility of the Mirny–Nyurba Mining and Processing Division was proposed and implemented. As a result of these measures, a CDR (Carbon Dioxide Removal)-type climate project with an atmospheric carbon dioxide removal capacity of up to 25,000 t CO₂/year was implemented in 2025–2026, representing the first project of this type in Russia.

It is shown that it is necessary to search for optimal methods for assessing landfill masses, as well as landfill biogas, in order to find effective technologies for the reclamation of landfills. A comparative analysis of existing methods for measuring methane fluxes has been performed. A set of express methods for analyzing man-made pollution of the geological environment at the waste disposal site is proposed, which allows obtaining reliable data on the state of the studied territory in the shortest possible time and allows for the qualitative development of measures for the reclamation of disturbed lands.

Studies on the biothermal treatment of waste containing components that inhibit microbial activity were presented. Waste materials were evaluated according to the concentrations of compounds suppressing the activity of compost microflora during the initial stage of the process, referred to as the lag phase. Process intensification of biothermal waste treatment was proposed through the use of inoculating additives and recycled compost, as well as the combination of pneumatic aeration and mechanical mixing using a composting machine operated in both continuous and batch modes. The developed technology was validated at a waste composting facility, constructed with the participation of the authors, for the treatment of waste recovered from a decommissioned long-term alcohol distillery stillage storage site. A structural layout and general view of selected process units of the facility were presented.

The possibilities of creating high-activity low-percentage ruthenium catalysts based on the (Ru+CeO₂ +ZrO₂)/C system for the neutralization of highly toxic organochlorine components of wastewater by the method of liquid-phase oxidation with atmospheric oxygen are considered. Shown that the use of Ru-CeO₂-ZrO₂ – carbon catalysts with a low content of Ru (up to 0.6 % wt.) and with a high dispersion of particles of both the active component and the promoter, makes it possible to achieve high degrees (up to 95 %) of water purification from dissolved organochlorine substances at relatively low temperatures (160–180 °C). The ability of catalysts to synthesize the active component in the studied reaction mixtures during testing.