 The denitrifying property of "Paracoccus denitrificans" has been used in creating a bioreactor, in this case, a tubular gel containing two bacteria, for the removal of nitrogen from wastewater.Paracoccus denitrificans reduces nitrite to nitrogen gas while "Nitrosomonas europaea" oxidizes ammonia to nitrite, thus fueling the former metabolism.This system simplifies the process of removing nitrogen from wastewater.