Electrochemical Methods for Cleansing of H_2S and SO_2 in Industrial and Natural Contaminated Waters Elcox Method

摘要

Hydrogen sulfide and sulfur dioxide are hazardous to the environment pollutants. They are contained in industrial and utility waste gases and waters as well as in some natural lakes and Seas. The present paper is a review of our studies on the electrochemical oxidation-reduction processes for SO_2 and H_2S cleansing by their oxidation with oxygen contained in the air. An innovative Carbon-Teflon structure of the electrodes (membranes) allows for the simultaneous electro-catalytic reactions of SO_2, H_2S and oxygen, proceeding on dispersed micro-galvanic elements, based on their chemical affinity without external power application. The physical model of electrochemical reactions in Carbon-Teflon electrodes is presented. The electrochemical nature of the processes is revealed using the additive principle. The results are used for development of processes for purification of SO_2 and H_2S from industrial gasses and waters. The major relations describing the processes, namely the impacts of sulfur dioxide and sulfuric acid concentrations have been studied. The revealed simplified expressions facilitate the performance estimation of an innovative process for SO_2 cleansing in waste gases, labeled ELCOX.