In the oral communication, the main results obtained by the personal reporter, as well as with the scientific researchers from the Mineral Resources and Water Chemistry Laboratory as well as from the Ecological Chemistry Laboratory of the Institute of Chemistry during 50 years of activity, are presented. The results of studies of the interaction processes of textile dye ions in aqueous solutions are presented. It has been demonstrated that the value of the association factor of dye ions is dependent on the possibility of forming intra- and extramolecular hydrogen bonds. The sorption processes and mechanisms of organic pollutants (dyes, detergents, amines, humic substances, etc.) on different activated carbons were studied. It has been demonstrated that the degree of utilization of carbon sorbent pores is a function of the ratio between the size of the adsorbent pores and the adsorbate ions or their associations. The research results of textile dye adsorption processes in dynamic conditions on a column with a length of 10.5 meters are also presented. The research results showed that the length of the adsorption layer under dynamic conditions must be at least 3.2 meters. The results of scientific research were the basis for the design and implementation of the waste water treatment plant at the Steaua Rosie factory from Chisinau. The scientific results related to the study of processes and mechanisms of carbonization and activation of secondary products from the processing of fruits and vines (peach pits, plums, apricots, grape seeds) are highlighted. The optimal parameters of the production technology of activated carbons from vegetable raw material have been established. The developed and patented technology was implemented at the activated carbon factory from Stefan Voda. Carbosan-E and Carbosan H enterosorbents were developed and patented on the basis of activated charcoal obtained from fruit pits and were used for detoxification of the human body. The results of the studies of the oxidation processes and mechanisms of activated carbons are also presented. The quality and quantity of the functional groups on the modified carbon adsorbents were determined. The immobilization processes and mechanisms of heavy metals on oxidized activated carbons were studied. The structural and catalytic properties of the carbon catalysts were obtained and studied. The processes and mechanisms of heterogeneous catalytic oxidation of S2-, NO2-, NH4+, Fe2+, Mn2+ ions in model solutions and in real groundwater containing these pollutants were studied. The research results were used for the development of groundwater potable technologies. The developed technology was patented and tested in Bulboaca commune, Anenii Noi district and town Hancesti and implemented in Sculeni commune, Ungheni district. In the oral communication, the results of studies of processes and mechanisms of depolymerization and oxidation of tannins obtained from grape seeds are highlighted. As a result of these processes, a new product was obtained which was patented under the name Enoxil. The antioxidant, antibacterial, antifungal, regenerative, toxic properties of the Enoxil preparation were investigated. The obtained results demonstrated that the preparation exhibits enhanced pharmaceutical properties and is not toxic. Based on the biologically active substance Enoxil, pharmaceutical preparations have been developed in the form of lotions and ointments. Preclinical in vitro and in vivo tests of the mentioned pharmaceutical preparations were carried out. Based on the results obtained, pharmaceutical monographs and technological regulations for the production of the biologically active substance Enoxil and pharmaceutical products based on this active substance were elaborated. It is mentioned that the pharmaceutical compounds obtained based on the biologically active substance Enoxil were tested in 4 republican clinics. The results obtained are very good. Currently, the technical-normative documentation for the industrial production of the pharmaceutical preparations based on the biologically active substance Enoxil is being developed. The chemical, physico-chemical and microbiological properties of tannins obtained from sawdust from oak wood, walnut and oak leaves were obtained, chemically modified and investigated. The results of research related to the obtaining of the new construction materials based on local raw materials, which were patented and implemented at SRL "Monolit", are also presented. A new process of depolymerization of tannins, through their halogenation, is described. The mechanism of the process was studied and the physico-chemical and microbiological properties of the new products obtained were investigated. The aim of these researches was to obtain biologically active substances with antifungal and antibacterial properties, which can be used as biodegradable pesticides for plant protection. I bring thanks to my colleagues: dr. hab. Mihail Ciobanu, dr. Victor Botan, dr. Nina Timbaliuc, dr. Raisa Nastas, dr. Oleg Petuhov, dr. Lucian Lupascu, dr. Irina Ginsari, dr. Maria Sandu, dr. Tatiana Goreacioc, sci. res. Tatiana Mitina et all.