Sequential Nitrification—Autotrophic Denitrification Using Sulfur as an Electron Donor and Chilean Zeolite as Microbial Support

Sequential nitrification–autotrophic denitrification (SNaD) was carried out for ammonium removal in synthetic wastewater (SWW) using sulfur as an electron donor denitrification. Four reactors were operated batch mode, two with zeolite (1 mm size) used microbial support and without support, to assess the effect of addition SNaD. Aeration, anoxic, anaerobic cycles established, where 96% NH4+-N (oxidized nitrite or nitrate) achieved nitrification, along 93% NO3−-N SNaD zeolite. It observed that use assists buffering reactor load changes. Inhibition caused by accumulation stage minimized increasing nitrogen concentration SWW. The results obtained this study are basis development simultaneous a single reactor.