اثرمترونيدازول بر دنيتريفيکاسيون بيولوژيک سودوموناس استوتزری در فاضلاب
Author(s): hossein Masoumbeigi1, abbas Rezaee * , hatam Godini 3
Masoumbeigi H, Rezaee A, Godini H.
Yafteh. 2012; 14 (4) :79-94
Article abstract:Background :
Pseudomonus stutzeri bactrerium is one of the most important and
effective denitrifier bacteria in wastewater. With regard to the
importance of effects of nitrate on water resources and human health and
role of metronidazole inhibition, this study was done with the aim of
survey of effect of metronidazole different concentrations on biological
denitrification of Pesudomonas stutzeri in wastwater. Materials and
Methods: This research was an experimental study. After sampling from
raw wastewater, identification and isolation of pseudomonus stutzeri
bactrerium were done. Bacteria suspension in specific culture medium and
metronidazole different concentrations in deionized water and nitrate
different concentrations for experimentals of nitrate removal under
anoxic conditions was prepared and metronidazole inhibition experiments
on activity of denitrification by pseudomonus stutzeri in synthetic and
real wastewater were conducted.
Results: Metronidazole at concentrations of 100, 200, 300 and 400mg/l, in synthetic wastewater containing nitrate concentrations to 500mg/l, had no inhibitory effect on activity of denitrification by pseudomonus stutzeri. Metronidazole at concentrations of higher than 800mg/l in synthetic wastewater and higher than 500mg/l in domestic wastewater had inhibitory effect. In 800mg/l metronidazole concentrations, with increasing the concentration of substrate(nitrate), significant reduction in the rate of nitrate removal by pseudomonus stutzeri was observed. This bacterium was added to three samples of domestic sewage, but had no effect on the rate of nitrate removal.
Conclusion: With ergard to strong ability of Pseudomonus stutzeri to remove nitrate high concentrations and high resistance of this bacterium against metrinidazole, biological denitrification process can have a high potential to be used for removal of nitrates high concentrations from industrial wastewater, particularly pharmaceutical industries wastewater.
Results: Metronidazole at concentrations of 100, 200, 300 and 400mg/l, in synthetic wastewater containing nitrate concentrations to 500mg/l, had no inhibitory effect on activity of denitrification by pseudomonus stutzeri. Metronidazole at concentrations of higher than 800mg/l in synthetic wastewater and higher than 500mg/l in domestic wastewater had inhibitory effect. In 800mg/l metronidazole concentrations, with increasing the concentration of substrate(nitrate), significant reduction in the rate of nitrate removal by pseudomonus stutzeri was observed. This bacterium was added to three samples of domestic sewage, but had no effect on the rate of nitrate removal.
Conclusion: With ergard to strong ability of Pseudomonus stutzeri to remove nitrate high concentrations and high resistance of this bacterium against metrinidazole, biological denitrification process can have a high potential to be used for removal of nitrates high concentrations from industrial wastewater, particularly pharmaceutical industries wastewater.
Keywords: Metronidazole, Biological denitrification, Pseudomonas stutzeri, Nitrate, Industrial wastewater treatment, Cytochrome P450 enzyme system
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