FEATURES OF CHANGES IN CHEMICAL COMPOSITION OF DRINKING WATER AS A RESULT OF WATER TREATMENT (LOVOZERO, KOLA PENINSULA)

Abstract

Link for citation: Mazukhina S.I., Drogobuzhskaya S.V., Sandimirov S.S., Masloboev V.A. Features of changes in chemical composition of drinking water as a result of water treatment (Lovozero, Kola Peninsula). Bulletin of the Tomsk Polytechnic University. Geo Аssets Engineering, 2023, vol. 334, no. 10, рр. 243-253. In Rus. The relevance. Waste water and drinking water treatment is an important and relevant environmental problem faced by the industry. The analysis of scientific literature makes it possible to conclude that it is necessary to apply the methods of water purification and disposal or to develop a scheme for each specific water body, taking into account its physico-chemical characteristics and ionic composition. It is believed that the reagents introduced during water treatment do not change its chemical composition. However, lack of an extended chemical analysis casts doubt on water chemical composition immutability. The main aim of this work is to assess changes in the chemical composition of drinking water supply in Lovozero village (Murmansk region) as a result of water treatment using physico-chemical modeling (PC «Selector»). Objects of the research are samples of the waters of the Virma river and drinking waters of the central water supply (canteen, column) of Lovozero village, selected in November 2021. Methods: inductively coupled plasma mass spectrometry (ELAN 9000 DRC-e, Perkin Elmer, USA), potentiometry (Expert-001, Russia) and titrimetry. Thermodynamic calculations were performed using the method of physico-chemical (thermodynamic) modeling implemented in the software package (PC «Selector»). Results. With the help of monitoring and physico-chemical modeling (PC «Selector») of natural waters of the Virma river and the waters of the central water supply (Lovozero village, Murmansk region), the influence of reagents used as a result of water treatment on water chemistry is assessed. The paper shows the change in pH, Eh values, water chemical composition, newly formed phases composition, depending on the amount of reagents (coagulant, liquid chlorine, soda and sodium hypochlorite (NaOCl). The formation of cations and anions of rare-earth elements at different concentrations of liquid chlorine indicates the possibility of creating a selective method of water purification from rare-earth elements on sorbents of different types or using these properties in ore enrichment. The replacement of reagents with NaOCl solid salt simplifies water treatment, but does not bring water chemical composition closer to that of bottled water and does not make it more useful for macro components.

Keywords

• Thermodynamic modeling
• natural and drinking water
• reagents
• water treatment
• REE
• uranium