In addition, several factors
(e.g., light or salts comprising sulfate or multivalent metal
cations) may have a negative influence on biomass formation
(Hyman and Arp 1992; Yan et al. 2010; Park and Ely 2008).
Nevertheless, chemolithoautotrophic nitrifying bacteria are
essential components of activated sludge used in domestic or
industrial wastewater treatment systems (Terada et al. 2013).
Their ammonia monooxygenase is also capable of oxidizing
many non-physiological substrates, like halogenated