Biodenitrification The controlled use of microbes, usually bacteria, to reduce level of nitrates (NO3 ) and thereby reclaim contaminated water or wastewater. The process consists of several stages to decompose the nitrates first into nitrites and then into nitrogen gas, N2. Upon entering the treatment process, sodium sulfite (Na2SO3) is added as a reducing agent to the wastewater to remove the oxygen from the water. To break down the nitrates, the bacteria must have a carbon food source and typically ethanol is added for the bacteria to feed on. In order to survive, however, the bacteria need oxygen which they obtain by breaking down the nitrate ions, first to nitrite and then to harmless nitrogen gas. Also referred to as Endogenous Respiration.
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