51. Effect of penicillin on nitrite-oxidizing bacteria in activated sludge.
- Author
-
Zhang SH and de los Reyes FL 3rd
- Subjects
- Bioreactors microbiology, Nitrification drug effects, Oxidation-Reduction drug effects, Time Factors, Waste Disposal, Fluid, Nitrates metabolism, Nitrobacter drug effects, Nitrobacter metabolism, Penicillin G pharmacology, Sewage microbiology
- Abstract
The effects of penicillin G on the number and activity of nitrite-oxidizing bacteria were investigated in laboratory-scale reactors and batch tests. At a concentration of 100 mg L(-1), addition of penicillin G for short periods did not significantly affect nitrite oxidation, while addition for more than 2 months suppressed nitrite oxidation. Fluorescence in situ hybridization with 16S ribosomal RNA-targeted probes revealed a slight decrease in the abundance of Nitrospira, while Nitrobacter was not affected by addition of penicillin G for more than 39 days. The resistance of nitrite-oxidizing bacteria to penicillin appeared to be positively affected by intermittent aeration only when accompanied by denitrification; otherwise, the aeration mode (continuous or intermittent aeration) did not significantly affect the abundance of Nitrobacter and Nitrospira.
- Published
- 2012
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