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The presence of antibiotic resistant bacteria in municipal wastewater treatment plants represents a real risk to human health. For the first time, this paper shows that the inactivation rate of cefotaxime resistant bacteria is the same as total bacteria when secondary effluents are treated by the solar photo-Fenton process. To obtain this result, an exhaustive and comparative kinetic study on the inactivation of both total and cefotaxime resistant bacteria (Total coliform, Escherichia coli and Enterococcus sp) was carried out, taking into account the effects of the main operation conditions, such as solar irradiance and iron concentration, and operation mode (batch and continuous). In all the operation conditions studied, no significant differences were found between the first order inactivation rate constants, k, of total and cefotaxime resistant bacteria. Additionally, k increased with solar irradiance and iron concentration. As for the effect of the operation mode, the main finding of this work is much quicker inactivation in continuous flow mode than in batch mode, pointing out its potential application at large scale. The best continuous operation condition to inactivate the bacteria to the detection limit (1 CFU mL), was at 22.4 min of hydraulic residence time with 5 mg Fe L and 30 mg HO·L. This treatment time is approximately a third of that reported in batch mode. The efficiency, in terms of figure of merits, of the continuous flow operation was 2.7 m of solar collector area to reduce one log of E. coli concentration per m of treated water and per hour, in comparison with 2137 m calculated for batch operation under the same solar UVA irradiance, 30 W m. This paper encourages research into continuous solar disinfection processes due to its enhanced efficiency with regard to the commonly used batch wise operation and shows that efficient removal of total bacteria ensures the removal of antibiotic resistant bacteria.
This article was published in the following journal.
Name: Water research
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Strains of the genus Enterococcus that are resistant to the antibiotic VANCOMYCIN. The enterococci become resistant by acquiring plasmids carrying genes for VANCOMYCIN RESISTANCE.
An antibiotic similar to FLUCLOXACILLIN used in resistant staphylococci infections.
A semisynthetic cephamycin antibiotic resistant to beta-lactamase.
Bacteria resistant to high temperatures, as in PASTEURIZATION.
A beta-lactamase inhibitor with very weak antibacterial action. The compound prevents antibiotic destruction of beta-lactam antibiotics by inhibiting beta-lactamases, thus extending their spectrum activity. Combinations of sulbactam with beta-lactam antibiotics have been used successfully for the therapy of infections caused by organisms resistant to the antibiotic alone.