Neutralization of Industrial Water by Electrodialysis

Membranes

Nunu Nakashidze¹  Irina Bejanidze²  Tina Kharebava²  Volodymyr Pohrebennyk³  Anton Petrov⁴  Oleksandr Petrov⁵  Natalia Iwaszczuk⁵ 

[1] Department of Agroecology and Forestry, Batumi Shota Rustaveli State University, Batumi, GE 6010, Georgia;Department of Chemistry, Batumi Shota Rustaveli State University, Batumi, GE 6010, Georgia;Department of Ecological Safety and Nature Protection Activity, Lviv Polytechnic National University, 79013 Lviv, Ukraine;Department of Information Systems, Kuban State Agrarian University Named after I.T. Trubilin, 350044 Krasnodar, Russia;Faculty of Management, AGH University of Science and Technology, 30-059 Kraków, Poland;

关键词: electrodialysis;    bipolar membrane;    solution pH correction;    water dissociation;   

DOI  :  10.3390/membranes11020101

来源: DOAJ

【 摘 要 】

The process of non-reagent adjustment of the pH of a NaCl solution (0.5 g/L) of different acidity was investigated by the method of bipolar electrodialysis on a device operating according to the K-system (concentration). The experiments were carried out in the range pH = 2.0–12.0 with monopolar cation-exchange MK-40 (for alkaline solutions) or anion-exchange MA-40 (for acidic solutions) and bipolar MB-2 membranes. The regularities of the change in the pH of the solution on the current density, process productivity and energy consumption for the neutralization process have been investigated. Revealed: with different productivity of the apparatus (Q = 0.5–1.5 m^3/h), in the range of pH 3.0–11.0, with an increase in the current density, a neutral pH value is achieved. It has been shown that at pH above 11.0 and below 3.0, even at high current densities (i > 20 A/m²), its value cannot be changed. This is due to the neutralization of the H⁺ or OH⁻ ions generated by the bipolar membrane by water ions, which are formed as a result of the dissociation of water molecules at the border of the monopolar membrane and the solution under conditions when the value of current exceeds the limiting value.

【 授权许可】

Unknown