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Abstract
Since the 1960s, the use of oxygen for generating ozone in operational potable water plants has increased significantly. However, at present, treatment of industrial process liquids and effluents require high dosages of ozone and have focused interest in higher ozone concentrations in the process gas. As a consequence, the use of oxygen to generate ozone has increased. Different options are possible: purchase liquid oxygen, producing liquid oxygen on-site by cryogenic processes, generating on-site gases rich in oxygen by pressure swing or vacuum swing adsorption-desorption, etc. The purpose of this contribution is to highlight the fundamental determinants of choice of the feed gas in ozone generation by electrical discharge.