Аннотация:This paper reports about successful laboratory testing of new nitrogen removal process called DEAMOX (DEnitrifying AMmonium OXidation) for treatment of such a strong nitrogenous wastewater as baker’s yeast effluent. The idea of this process is based on recently discovered ANAMMOX (ANAerobic AMmonium Oxidation) reaction, which is realised under autotrophic denitrifying conditions using sulphide as an electron donor for production of nitrite within anaerobic biofilm. To generate sulphide and ammonia, the UASB reactor was used as a pre-treatment step. The anaerobic effluents thus produced were partially fed to nitrifying activated sludge reactor (to generate nitrate) and the rest directly to the DEAMOX reactor where they were mixed with the nitrified effluent. The results achieved with the nitrogen loading rates above 1000 mg/l/d and the total 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 and are comparable (somewhat higher) with those for the combination of SHARON-ANAMMOX processes. The paper describes also some characteristics of the DEAMOX sludge as well as the preliminary results of its microbiological characterisation.