Development of RuO2/TiO2 titanium anodes and a device for in situ active chlorine generation

Abstract

Chlorine is used worldwide for water disinfection purposes. However, due to its toxicity the EU has imposed a set of standards that must be applied when transporting and storing chlorine. In Serbia, numerous studies have been conducted attempting to develop the technology for the generation of active chlorine disinfectant, but with a non-toxic aqueous solution of sodium chloride as the raw material. This study provides an overview of the titanium anodes activated by thermally obtained solid solution of ruthenium and titanium oxide development. It also presents new findings on the effect of the temperature of thermal treatment, the composition, the thickness of an active coating on its microstructural properties, and consequently on the catalytic activity, ion selectivity, and corrosion stability during active chlorine generation through the electrolysis of dilute sodium chloride solutions at room temperature. The study also evaluates the effect of the kinetic and operational parameters of the electrochemical process of active chlorine generation on both current and energy efficiencies. The results obtained were used to determine optimal values of technological parameters of the production process. This comprehensive research resulted in the construction of different types of remote-controlled and fully automated active chlorine generating plants.

U radu je dat pregled razvoja aktivnih titanskih anoda za reakciju oksidacije hloridnih jona u istraživačkim laboratorijama u Srbiji. Prikazani su i novi rezultati istraživanja efekta temperature termičke obrade, sastava i debljine aktivne RuO2/TiO2 prevlake na titanu na njena mikrostrukturna svojstva i odraz ovih svojstava na katalitičku aktivnost, jonselektivnost i korozionu stabilnost u procesu dobijanja aktivnog hlora. Ustanovljen je i efekat kinetičkih i operativnih parametara procesa elektrolize razblaženih rastvora natrijum-hlorida na iskorišćenje struje i energije po aktivnom hloru. Na osnovu ovih ispitivanja konstruisana je ćelija za elektrolizu i utvrđene su optimalne vrednosti tehnoloških parametara procesa proizvodnje aktivnog hlora. Sveobuhvatna istraživanja rezultirala su konstrukcijom različitih tipova postrojenja za in situ proizvodnju aktivnog hlora.