A: Nitrosomonas, nitrobacter, and nitrosococcus bacteria are commonly found in the soil and water can easily wash into a wastewater plants (WWTPs). However, for WWTPs that loose nitrification or struggle with nitrification issues (e.g., during drought conditions, or in areas with deep permafrost where the naturally-occurring availability of these organisms may be limited) AQUAFIX’s VitaStim Dynamic Duo provides the perfect blend of Nitrosomonas and Nitrobacter cultures.

They generally grow as single cells but may be held together by slime. They are extremely sensitive to changes in their environment and die off because acute toxicity is common.


Q: What Factors Affect Nitrification?


  • pH: 7.5 – 8.5 is preferred. Nitrifiers use ammonia best in this pH range as ammonia is not ionized. Nitrifiers have the ability to adapt to changes in pH, but sudden changes in pH are toxic to their presence.
  • Oxygen: Nitrification requires 8 pounds of oxygen for pound of ammonia. A dissolved oxygen of at least 1.0 ppm is recommended although an oxygen level down to 0.5 ppm may still work.
  • Heavy metals: Nitrifiers may be limited in industrial situations where frequent or accidental discharges of metals happen.
  • Age: Nitrifiers prefer a higher sludge age and increased contact time.
  • Plant design: Nitrication effectiveness is also a function of plant design, capacities, efficiency, and plant operation.

At AQUAFIX, we have the expertise to help our customers resolve even the toughest cases where WWTPs lose nitrification and need fast answers.



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