TABLE 1.

Important physiological parameters for anaerobic and aerobic ammonium oxidation

Parameter	Anammox result	Nitrificationa result	Unit
Maximum specific aerobic NH4+ consumption rate	0	2–5	g of NH4+-N · g of protein−1 day−1
Maximum specific anaerobic NH4+ consumption rate	1.1	<0.05b	g of NH4+-N · g of protein−1 day−1
Biomass yield	0.07	0.1	g of protein · g of NH4+-N−1
Activation energy	70	70	kJ · mol−1
Affinity for ammonium	≤10−4	≥10−4	g of NH4+-N · liter−1
Affinity for nitrite	≤10−4	NAc	g of NO2−-N · liter−1
Nitrite inhibition of ammonium consumption	Ki = 0.8, α = 0.8	Usually	g of NO2−-N · liter−1
Nitrite inhibition of nitrite consumption	Ki = 1, α = 0.7	NA	g of NO2−-N · liter−1
Temp range	20–43	≤42°C	°C
pH range	6.7–8.3	Variable
Protein content of biomass	0.6	Variable	g of protein · g total dry weight−1
Protein density	50	Variable	g of protein · liter biomass−1

^aData were obtained as described in reference 7, except where noted. 

^bAs described in reference 8 

^cNA, not applicable.