03. Shabarin A. A., Vodyakov V. N., Kotin A. V., Kuvshinova O. A., Matushkina Y. I. Purification of Drinking Water from Fluorides by Reverse Osmosis

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UDC 644.618.6:54.058

DOI: 10.15507/0236-2910.028.201801.036-047

Purification of Drinking Water from Fluorides by Reverse Osmosis

Aleksander A. Shabarin
Associate Professor, General and Inorganic Chemistry Chair, Institute of Physics and Chemistry, National Research Mordovia State University (68 Bolshevistskaya St., Saransk 430005, Russia), Ph.D. (Chemistry), ResearcherID: W-1047-2017, ORCID: http://orcid.org/0000-0001-6804-8471, This email address is being protected from spambots. You need JavaScript enabled to view it.

Vladimir N. Vodyakov
Professor, Chair of Mechanization of Processing of Agricultural Products, Institute of Mechanics and Power Engineering, National Research Mordovia State University (68 Bolshevistskaya St., Saransk 430005, Russia), D.Sc. (Engineering), ResearcherID: G-6800-2017, ORCID: http://orcid.org/0000-0002-4687-1798, This email address is being protected from spambots. You need JavaScript enabled to view it.

Aleksander V. Kotin
Head of Chair of Mechanization of Processing of Agricultural Products, Institute of Mechanics and Power Engineering, National Research Mordovia State University (68 Bolshevistskaya St., Saransk 430005, Russia), D.Sc. (Engineering), Professor, ResearcherID: W-1087-2017, ORCID: http://orcid.org/0000-0001-8235-0052, This email address is being protected from spambots. You need JavaScript enabled to view it.

Olga A. Kuvshinova
Associate Professor, Chair of Mechanization of Processing of Agricultural Products, Institute of Mechanics and Power Engineering, National Research Mordovia State University (68 Bolshevistskaya St., Saransk 430005, Russia), Ph.D. (Engineering), ResearcherID: S-8884-2017, ORCID: http://orcid.org/0000-0001-6457-5565, This email address is being protected from spambots. You need JavaScript enabled to view it.

Yulia I. Matushkina
Associate Professor, General and Inorganic Chemistry Chair, Institute of Physics and Chemistry, National Research Mordovia State University (68 Bolshevistskaya St., Saransk 430005, Russia), Ph.D. (Chemistry), ResearcherID: W-1052-2017, ORCID: http://orcid.org/0000-0001-9840-7244, This email address is being protected from spambots. You need JavaScript enabled to view it.

Introduction: An important task in the sphere of sanitary and epidemiological welfare of the population of the Russian Federation is provision of drinking water. Tap water must not contain pathogenic bacteria and dangerous chemicals. Purification systems regulate the concentration of fluoride ions in drinking water. The aim of this paper is to study the possibility of purifying tap water from fluoride ions by reverse osmosis.
Materials and Methods: We used the Alfa Laval PilotUnit 2.5 "RO/NF with a set of spiral-type membrane elements RO99-2517/48 to remove fluoride ions. We measured the concentration of fluoride ions by the potentiometric method using the Hanna HI 2211 (pH/mV/T). Fluoride-selective electrode ELIS 131 F was used as an indicator electrode and the standard chloride-silver electrode EVL-1M3 was used as a reference electrode. Both the calibration and buffer solutions were prepared from chemically pure reagents and A. R. purity for analysis reagents according to GOST 4386-89.
Results: A single passage of water through the reverse osmosis membrane reduced the concentration of fluoride ions from 2.29 ± 0.02 to 0.240 ± 0.015 mg/l. Double passage of water reduced the concentration by a factor of two. As the concentration of fluoride ions increased in the retentate, the concentration in the filtrate slightly increased too. Purification of water reduced the concentration of fluoride ions from 20 mg/l, to 0.5 mg/l.
Discussion and Conclusions: Thus, using the Alfa Laval PilotUnit 2.5" RO/NF with a set of spiral-type membrane elements RO99-2517/48 filters tap water of ions of fluoride to the maximum allowable concentration. This study opens the perspective of using reverse osmosis to purify tap water with high concentration of fluoride ions.

Keywords: tap water, fluoride ions, fluorides, reverse osmosis, potentiometric analysis

For citation: Shabarin A. A., Vodyakov V. N., Kotin A. V., Kuvshinova O. A., Matushkina Y. I. Purification of Drinking Water from Fluorides by Reverse Osmosis. Vestnik Mordovskogo universiteta = Mordovia University Bulletin. 2018; 28(1):36–47. DOI: 10.15507/0236-2910.028.201801.036-047

This work is licensed under a Creative Commons Attribution 4.0 License.