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The water pollution caused by nutrients has become a problem, especially in agricultural areas. Nitrogen (N) and phosphorus (P) can cause the eutrophication of surface waters, and problems with their use as drinking water sources. One of the possible solutions is to employ denitrifying bioreactors, which are used for the reduction of high nitrate concentrations in shallow groundwaters. Our research was focused on the enhancement of these bioreactors with steel byproducts. These materials release Fe, which causes t...