Premium
Influence of heavy metals on microbial growth kinetics including lag time: Mathematical modeling and experimental verification
Author(s) -
Şengör S. Sevinç,
Barua Sutapa,
Gikas Petros,
Ginn Timothy R.,
Peyton Brent,
Sani Rajesh K.,
Spycher Nicolas F.
Publication year - 2009
Publication title -
environmental toxicology and chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.1
H-Index - 171
eISSN - 1552-8618
pISSN - 0730-7268
DOI - 10.1897/08-273.1
Subject(s) - lag , environmental chemistry , bacterial growth , substrate (aquarium) , lag time , aeration , chemistry , zinc , kinetics , environmental science , metabolic activity , ecology , biological system , biology , bacteria , computer network , physics , organic chemistry , quantum mechanics , computer science , genetics
Heavy metals can significantly affect the kinetics of substrate biodegradation and microbial growth, including lag times and specific growth rates. A model to describe microbial metabolic lag as a function of the history of substrate concentration has been previously described by Wood et al. ( Water Resour Res 31:553–563) and Ginn ( Water Resour Res 35:1395–1408). In the present study, this model is extended by including the effect of heavy metals on metabolic lag by developing an inhibitor‐dependent functional to account for the metabolic state of the microorganisms. The concentration of the inhibiting metal is explicitly incorporated into the functional. The validity of the model is tested against experimental data on the effects of zinc on Pseudomonas species isolated from Lake Coeur d'Alene sediments, Idaho, USA, as well as the effects of nickel or cobalt on a mixed microbial culture collected from the aeration tank of a wastewater treatment plant in Athens, Greece. The simulations demonstrate the ability to incorporate the effect of metals on metabolism through lag, yield coefficient, and specific growth rates. The model includes growth limitation due to insufficient transfer of oxygen into the growth medium.