Establishing a dependence of the efficiency of low-pressure reverse osmotic membranes on the level of water mineralization

Authors

DOI:

https://doi.org/10.15587/1729-4061.2022.263367

Keywords:

water demineralization, reverse osmosis, low-pressure membranes, permeate, concentrate

Abstract

This paper has established the dependence of the effectiveness of the reverse-osmotic low-pressure membranes Filmtec TW30-1812-50 on the initial concentrations of sulfate and sodium chloride in the range of 20–1000 mg/dm3 at the degrees of permeate selection of 1–90 % with the use of pressure of 3.6–10.0 atm. The dynamics of increasing the content of sulfates and chlorides in concentrates with an increase in the degree of permeate selection, selectivity, productivity, and filtration coefficient of the membrane have been determined. The conditions for calculating the membrane performance depending on the working pressure for sodium sulfate and sodium chloride have been defined.

It is shown that the concentrations of sulfates and chlorides in permeates depend on their initial concentration in solutions and increase both with an increase in the initial concentration and with an increase in the degree of permeate selection. The latter factor is quite significant at the initial concentrations of chlorides and sulfates at a concentration of 1000 mg/dm3. The productivity of the membrane increases with a decrease in the salt content in water and decreases as the degree of permeate selection increases, which leads to an increase in the concentration of salts in the premembrane space.

The selectivity of the membrane increases with increasing concentration of sodium sulfate and sodium chloride solutions in solutions, despite a certain increase in salt concentrations in permeates. For solutions of Na2SO4 and NaCl (20–1000 mg/dm3) at their reverse-osmotic desalting on the membrane, the filtration coefficients have constant values. For these initial concentrations, the filtration coefficient for Na2SO4 is 3.4–3.8 dm3/(m2∙atm), and for NaCl – 2.6–3.2 dm3/(m2∙atm). The data reported here allow us to conclude about the permissible level of mineralization, at which it is advisable to use reverse-osmotic low-pressure membranes. It is shown that an increase in the concentration of salts in concentrates leads to an increase in osmotic and working pressures

Author Biographies

Mykola Gomelya, National Technical University of Ukraine «Kyiv Polytechnic Institute named Igor Sikorsky»

Doctor of Technical Sciences, Professor, Head of Department

Department of Ecology and Technology of Plant Polymers

Anna Vakulenko, National Technical University of Ukraine «Kyiv Polytechnic Institute named Igor Sikorsky»

Postgraduate Student

Department of Ecology and Technology of Plant Polymers

Iryna Makarenko, National Technical University of Ukraine «Kyiv Polytechnic Institute named Igor Sikorsky»

PhD, Senior Researcher

Department of Ecology and Technology of Plant Polymers

Tetyana Shabliy, National Technical University of Ukraine «Kyiv Polytechnic Institute named Igor Sikorsky»

Doctor of Technical Sciences, Professor

Department of Ecology and Technology of Plant Polymers

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Published

2022-08-30

How to Cite

Gomelya, M., Vakulenko, A., Makarenko, I., & Shabliy, T. (2022). Establishing a dependence of the efficiency of low-pressure reverse osmotic membranes on the level of water mineralization . Eastern-European Journal of Enterprise Technologies, 4(10 (118), 14–23. https://doi.org/10.15587/1729-4061.2022.263367

Issue

Vol. 4 No. 10 (118) (2022): Ecology

Section

Ecology

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Copyright (c) 2022 Mykola Gomelya, Anna Vakulenko, Iryna Makarenko, Tetyana Shabliy

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