اثر نانو ذره نقره در حذف باکتری کلبسیلا پنومونیه جدا شده از پسابهای صنعتی صنایع همدان

Introduction: Progress in nano-science and nanotechnology in the past decade has provided many opportunities to study the biological effects of nanoparticles, in particular their anti-bacterial effects. The aim of this study was to evaluate the antimicrobial properties of silver nanoparticles for the removal of Klebsiella pneumoniae isolated from industrial effluents. Methods: In this experimental study, after sampling polluted industries, coliform and total coliform measurements of fecal industrial wastewater microbiology were performed by standard methods. The antimicrobial activity of silver nanoparticles on the bacteria (Klebsiella pneumoniae isolates and standard) was evaluated with the agar dilution method and broth dilution. One milliliter suspension containing bacteria at 1.5 × 108 CFU/mL was added to each sample followed by incubation at 37°C for 24 hours. After the mentioned period, the optical density at a wavelength of 600 nm was used to measure the concentration of bacteria. Next, 100 mL of each dilution was transferred to solid medium followed by incubation. The results were analyzed with SPSS 22 software. Results: Fecal and total coliform bacteria pollution of textile wastewater was approved, and Klebsiella pneumoniae (textile industry pollution index) were isolated. With increasing concentration, the antibacterial activity of silver nanoparticles increased while the number of colonies decreased. Although none of the concentrations were able to eliminate the bacteria, a non-significant decrease in the number of bacteria was observed. Conclusion: The results of the study showed that the type of bacteria and concentrations of silver nanoparticles antimicrobial properties of silver nanoparticles are risk factors. Although the concentrations used were effective against bacteria yet they did not lead to complete elimination of bacteria Therefore potential impact of nanoparticles for use requires further research and economic factors and other factors should be considered in their application.