The paper discusses the impact of the C/N ratio of inorganic carbon (KHCO₃) and its interaction with carbon dioxide liberated by the oxygenation of a carbon electrode and with gaseous hydrogen produced by water electrolysis, on the concentration of oxygenated forms of nitrogen, during the process of autotrophic denitrification in a multi-catode reactor with immobilized biofilm. The experiment was set under anaerobic conditions, at the electric current density of 79 mA/m² and the C/N ratios of 0.5, 0.75 and 1.0. The results showed that a higher dose of inorganic carbon (KHCO₃) significantly decreased the concentration of nitrate. The concentration of this form of nitrogen was even lower in a reactor additionally loaded with CO₂ and H₂, in which the physicochemical parameters of sewage sludge (the redox potential and electrolytic conductivity) were therefore better for the denitrification process. Nitrate was not completely consumed by dissimilation reduction in either of the reactors. Some small amount of this compound was converted to the ammonium form on the assimilation pathway. In addition, the carbon electrode served as an acceptor of electrones, in the process of external oxygenation of organic compounds.
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