DEVELOPMENT RESEARCH AND APPLICATION OF ELECTROCHEMICAL ACTIVATION TECHNOLOGY IN VIETNAM
Abstract
Solutions which possess the highest biocidal activity among all known liquid chemical germicides at low toxicity for warm-blooded organisms are those electrochemically activated (ECA) solutions to which bacteria can not adapt. Invented in Russia by engineer V. M. Bakhir since 1975 the electrochemical activation processeswere registered as a new scientific trend in applied electrochemistry by the former USSR Academyof Science in 1984. Electrochemical activation is a combination of electrochemical and electrophysical actions on water solution with a low mineralization in the area of spatial charge near the electrode surface during nonequilibribrium transfer of charge by electrons through the border "electrode - electrolyte", and, as a result, water becomes metastable for dozens hours, demonstrating an increased reactivity in various physical and chemical processes.
The ECA devices are produced essentially under the name STEL, which differ from the other types of ECA solution generators by using a part of the catholyte for producing the anolyte Nghiên cứu phát triển và ứng dụng công nghệhoạt hóa điện hóa ởViệt Nam 941 product. The STEL type ECA devices such as STEL-ANKand STEL-ANK “M” have been manufactured in Vietnam on the basis of using imported flow-through electrolytical modules FEM-3 and MB-11, while STEL-ANK-PRO using electrolyticalchamber MB-26 was imported completely from Russia. The metastability level andbactericidal activity of the neutral anolyte solutions obtained from these devices have been studied in comparison with hypoclorite solution produced in a non-diaphragm electrolytical chamber.The experimental data obtained showed that all the anolyte ANK solutions demonstrate a high bactericidal activity with a prolongated
metastability that after 4 weeks preservation theirORP decreased only 2-5 %. Among the investigated neutral anolyte solutions anolyte ANK-PRO exhibits highest disinfection activity and metastability due to its low mineralization as well as its hydraulical specificness of the STEL-ANK-PRO device that allows to remove more completely heavy metal ions hydroxides from the solution.
In cooperation with Institute of Electrochemical Systems and Technologie of RAMS Institute of Environmental technology of VAST usingelectrolytical modules imported from Russia have manufactred STEL type ECA devices and successfully applied them for disinfection purposes