Simultaneous nitrification and denitrification in fixed film applications

In Wastewater treatment denitrification describes the final step of the conversion from ammonium NH4+ to Nitrogen gas N2. After ammonium is oxidized by microorganisms in a 2-step process ammonium is at first converted to Nitrate NO3-. Nitrate NO3- is still in the wastewater and although is less harmful than ammonia it can still cause diseases.

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