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Nitrite Oxidizing Bacteria (NOB)

Nitrobacter winogradskyi

Nitrospina Nitrococcus Nitrospira

  • Convert nitrite to nitrate

  • Substrate is Free Nitrous Acid, HONO

  • Product is Free Nitric Acid, HONO2

  • Some NOB grow mixotrophically

Dissolved Oxygen Growth Rate vs. Temp.

Yield FA Inhibition FNA Inhibition Salt Inhibition Chemical Inhibition

AOB vs. NOB

KOA 0.6 vs. 1.2 mg O2/L AOB higher > 25˚C NOB higher < 20˚C AOB higher NOB more sensitive NOB more sensitive NOB more sensitive AOB more sensitive

Denitrification

N i t r a t e N i t r i t e N O N 2 O N 2 Heterotrophs using anoxic respiration in four processes

Carbonaceous material as electron donor

Nitrate, Nitrite, NO and N2O as the electron acceptors

Cellular yield lower than aerobic respiration

Assimilative nitrate reduction to ammonia (ANRA)

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