Аннотация:This paper reports about the successful laboratory testing of a new nitrogen removal process called DEAMOX (DEnitrifying AMmonium OXidation) for treatment of such a strong nitrogenous wastewater as baker’s yeast effluent. The concept of this process combines the recently discovered ANAMMOX (ANaerobic AMMonium OXidation) reaction with autotrophic denitrifying conditions using sulphide as an electron donor for the production of nitrite within an anaerobic biofilm. The achieved results with nitrogen loading rate of higher than 1000 mg/l/d and nitrogen removal of around 90% look very promising because they exceed (in 9-18 times!) the corresponding nitrogen removal rates of conventional activated sludge systems. The paper describes also some characteristics of DEAMOX sludge as well as the preliminary results of its microbiological characterisation.