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40 years of the Department of Industrial Ecology
ArticleName Comparative analysis of reverse osmosis and ion exchange methods in the preparation of make-up water for recycling water supply of metallurgical industries
DOI 10.17580/chm.2023.08.11
ArticleAuthor A. V. Desyatov, T. A. Pavlishcheva, D. V. Panfilova

Mendeleev University of Chemical Technology of Russia, Moscow, Russia:

A. V. Desyatov, Dr. Eng., Prof., Dept. of Industrial Ecology, e-mail:
T. A. Pavlishcheva, Postgraduate Student


25 State Research Institute of Chemmotology of the Ministry of Defense of the Russian Federation, Moscow, Russia:
D. V. Panfilova, Cand. Chem., Researcher, Laboratory 132 of the 1st Department


Industrial water supply systems at many facilities use water from natural sources, and often it must be of high quality. One of the main consumers of water at present is metallurgical production. Most often, the water used by metallurgical enterprises is added to the circulating water supply system to replace water lost as a result of purging, evaporation, wind transfer, leaks, steam or intake from these systems. The make-up water directed to compensate for losses must undergo thorough preparation in order to avoid the formation of deposits, corrosion and other problems in the circulating water supply system. The scheme and technology of the water treatment process for metallurgical production depends on the parameters of the source water and the quality requirements of the prepared make-up water, ensuring the desired quality of the recycled water. The main requirement for the quality of make-up water is the low hardness content obtained during water treatment. One of the promising methods of water treatment in our time are membrane technologies. The steady reduction in production costs per 1 m3 of water by reverse osmosis allows it to be used as a method of reducing the hardness (softening) of water, instead of the widely used ion exchange. This article shows the fundamental possibility of using the reverse osmosis process for the preparation of make-up water, which allows to reduce the amount of used reagents significantly and to reduce capital and operating costs. The results of the calculation of three variants of reverse osmosis plant schemes are presented: with one stage for concentrate, with two stages for concentrate and with the return of part of the concentrate to the cycle. The presented schemes have energy consumption from 0.18 to 0.65 kWh/m3, salinity and residual hardness of no more than 31 mg/dm3 and 0.07 mg-eq/dm3. These schemes also differ in the volume and concentration of the discharged concentrate, which makes it possible to optimize the anthropogenic load on the environment, the possibility of reducing resource consumption is shown.
The researches were carried out using D. Mendeleev Center for collective use of scientific equipment, within the framework of the project No. 075-15-2021-688.

keywords Water treatment, make-up water, ion exchange, reverse osmosis, recycling, concentrate

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