||Disinfection Resistance of 'Legionella pneumophila' and 'Escherichia coli' Grown in Continuous and Batch Culture.
Hoff, J. C. ;
Roberts, P. V. ;
Matin, A. ;
Berg, J. D. ;
||Stanford Univ., CA. ;Rio Linda Chemical Co., CA.;Environmental Protection Agency, Cincinnati, OH. Water Engineering Research Lab.
Chlorine dioxide ;
Legionella pneumophila ;
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
Legionella pneumophila and Escherichia coli were grown in continuous culture to simulate nutrient-limited, sub-optimal growth conditions that are often experienced in aquatic environments. Washed cultures were treated with chlorine dioxide (C10(2)) or chlorine at a dose equal to 0.75 mg/l. Results showed that the chemostat grown populations of both species were more resistant to inactivation than were their batch-culture grown counterparts. C10(2) was shown to be superior to chlorine on a mass-dose basis in inactivating L. pneumophila. The adequacy of E. coli, a major constituent of the coliform group, as an indicator of Legionella inactivation depended on the antecedent growth conditions: the inactivation behavior of the two organisms grown in continuous culture was similar, whereas L. pneumophila was more resistant than E. coli when both were grown in batch culture.