- Ammonia Oxidizing Bacteria (AOB) convert Ammonia --> Nitrite
- Ammonia Oxidizing Archaea (AOA) convert Ammonia --> Nitrite
- Nitrite Oxidizing Bacteria (NOB) convert Nitrite --> Nitrate
- Anammox - Nitrite + Ammonia --> Nitrogen Gas
- Heterotrophic (Denitrification & Nitrification)
BOD5 + Nitrate/Nitrite --> Nitrogen gas (oxidized nitrogen as alternative electron acceptor)
Ammonia/Nitrite --> Proteins, oxidized nitrogen (not primary energy source for microbes)
Organisms & ecological niches of organisms responsible for ammonia oxidation & nitrogen removal
As ammonia has a high oxygen demand and potential toxicity to animals in receiving streams, ammonia has long been permitted in wastewater treatment plants Additional concerns about nitrite and nitrate creating algae blooms has created a need for completing the nitrogen cycle by reducing nitrate/nitrite concentrations via denitrification (producing nitrogen gas. Research over the past few decades has increased our understanding of the various bacteria and archaea associated with the nitrogen cycle. For reference, I will break out the organisms into their kingdom and ecological niche:
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Erik Rumbaugh has been involved in biological waste treatment for over 20 years. He has worked with industrial and municipal wastewater facilities to ensure optimal performance of their treatment systems. He is a founder of Aster Bio (www.asterbio.com) specializing in biological waste treatment.
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