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Aerobic denitrification, or co-respiration, the simultaneous use of both oxygen (O 2) and nitrate (NO − 3) as oxidizing agents, performed by various genera of microorganisms. [1] This process differs from anaerobic denitrification not only in its insensitivity to the presence of oxygen, but also in its higher potential to form nitrous oxide ...
Aerobic denitrifiers are mainly Gram-negative bacteria in the phylum Proteobacteria. Enzymes NapAB, NirS, NirK and NosZ are located in the periplasm, a wide space bordered by the cytoplasmic and the outer membrane in Gram-negative bacteria. [16] A variety of environmental factors can influence the rate of denitrification on an ecosystem-wide scale.
Denitrifying bacteria have been identified in over 50 genera with over 125 different species and are estimated to represent 10-15% of bacteria population in water, soil and sediment. [3] Denitrifying include for example several species of Pseudomonas, Alcaligenes, Bacillus and others. Pseudomonas stutzeri, a species of denitrifying bacteria
Paracoccus denitrificans, is a gram-negative, coccus, non-motile, denitrifying (nitrate-reducing) bacterium. It is typically a rod-shaped bacterium but assumes spherical shapes during the stationary phase. [1] Like all gram-negative bacteria, it has a double membrane with a cell wall.
The most common bacteria responsible for the two step conversion are the autotrophic organisms, Nitrosomonas and Nitrobacter, and many different heterotrophs. The former obtain energy from the oxidation of ammonia, obtain carbon from CO 2, and use oxygen as the electron acceptor. They are termed autotrophic because of their carbon source and ...
Pseudomonas denitrificans is a Gram-negative aerobic bacterium that performs denitrification.It was first isolated from garden soil in Vienna, Austria.It overproduces cobalamin (vitamin B 12), which it uses for methionine synthesis [1] and it has been used for manufacture of the vitamin. [2]
Acinetobacter Haemolyticus or ZYL is a new aerobic denitrifying bacterium. The strain could use nitrate, nitrite and ammonium as the sole N-source for growth with a final product of N2, demonstrating its good abilities for aerobic denitrification and heterotrophic nitrification.
Conventional nitrogen removal from ammonium-rich wastewater is accomplished in two separate steps: nitrification, which is mediated by aerobic ammonia- and nitrite-oxidizing bacteria and denitrification carried out by denitrifiers, which reduce nitrate to N 2 with the input of suitable electron donors.