Research of environmentally safe method of wastewater disposal by electrolyzes

G.V. Kucherik, Yu.A. Omelchuk. E.V. Zablotskaya

Federal State Educational Institution of Higher Education «Sevastopol State University», RF, Sevastopol, Universitetskaya St., 33

Email: Galina_kucherik@mail.ru

DOI: 10.33075/2220-5861-2020-1-102-108

UDC 628.386

Abstract:

     All modern methods of processing waste regeneration solutions are reduced to the neutralization of the formed liquid waste, which creates certain problems because of formation of secondary waste. A cardinal solution to the problem of preventing the dumping of mineralized regeneration solutions of ionite installation is their processing for the purpose of subsequent disposal.

     The most optimal method for solving the problem of processing regeneration solutions can be their restoration using electrodialysis installations.

     During the studies, a four-chamber electrolyzer was used, in which the anode cell and the cathode region are separated by MK-40 cationic membranes. The space between the cationic membranes is separated by an MA-41 anionic membrane. The design of the electrolyzer is such that in the cathode space alkali is formed and accumulated. At the cathode the main process is the formation of hydrogen and hydroxide anions while at the anode oxygen and protons are mainly formed.

     Chamber II, in which the working solution was placed, is a desalination chamber, chamber III is the hydrochloric acid accumulation zone, chamber I is the cathode region where the alkali is accumulated, and chamber IV is the anode region.

     In order to determine a possible limit level of alkali concentrations in the cathode region and acid in the anode region obtained by electrolysis, a series of electrolysis processes were carried out with an increase in the initial concentrations of alkali in the cathode region and acid in chamber III. When a solution of sodium chloride electrolyzes it was quite easy to obtain a concentration of acid and alkali at the level of 5-8%. With a further increase in concentrations, the degree of water purification from sodium chloride decreases with time, as does the current output of hydrochloric acid.

Key words: hydrochloric acid, wastewater, chlorides, alkali, electrodialysis, electrolyzer.

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[IEEE] G. V. Kucherik, Y. A. Omelchuk, and E. V. Zablotskaya, “Research of environmentally safe method of wastewater disposal by electrolyzes,” Monitoring systems of environment, no. 1, pp. 102–108, Mar. 2020.

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