Inactivation and regrowth of multidrug resistant bacteria in urban wastewater after disinfection by solar-driven and chlorination processes

Fiorentino, Antonino; Ferro, Giovanna; Alférez, María Castro; Polo-López, M.I.; Fernández‐Ibáñez, Pilar; Rizzo, Luigi

doi:10.1016/j.jphotobiol.2015.03.029

Cited by 126 publications

(47 citation statements)

References 38 publications

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“…In particular, solar-based photocatalytic AOPs is one of the most promising, safe, low-cost and effective technologies for polluted water treatment, and has been applied to a wide range of environmental pollution situations [123]. Among AOPs, TiO2-based photocatalysis has recently emerged as an interesting water disinfection option for solar applications [122], due to its high oxidative efficiency, photochemical stability, nontoxicity and low cost. However, the high recombination ratio of photoinduced e − /h + pairs and the poor response to visible light have hindered the application of TiO2 in photocatalysis.…”

Section: Water Remediationmentioning

confidence: 99%

“…Alternative methods such as sedimentation, filtration, chemical and membrane technologies involve high operating costs and could generate toxic secondary pollutants in the ecosystem [121]. Conventional methods such as chlorination are widely used disinfection processes; however, chlorine can react with organic matter and other precursors to form regulated and emerging disinfection byproducts, which can be associated with cancer or another human pathologies [122]. These concerns have rapidly increased the interest of the scientific community in the field of "Advanced Oxidation Processes (AOPs)" as possible innovative alternatives to conventional disinfection processes.…”

Section: Water Remediationmentioning

confidence: 99%

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Visible-Light-Active TiO2-Based Hybrid Nanocatalysts for Environmental Applications

et al. 2017

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Photocatalytic nanomaterials such as TiO 2 are receiving a great deal of attention owing to their potential applications in environmental remediation. Nonetheless, the low efficiency of this class of materials in the visible range has, so far, hampered their large-scale application. The increasing demand for highly efficient, visible-light-active photocatalysts can be addressed by hybrid nanostructured materials in which two or more units, each characterised by peculiar physical properties, surface chemistry and morphology, are combined together into a single nano-object with unprecedented chemical-physical properties. The present review intends to focus on hybrid nanomaterials, based on TiO 2 nanoparticles able to perform visible-light-driven photocatalytic processes for environmental applications. We give a brief overview of the synthetic approaches recently proposed in the literature to synthesise hybrid nanocrystals and discuss the potential applications of such nanostructures in water remediation, abatement of atmospheric pollutants (including NO x and volatile organic compounds (VOCs)) and their use in self-cleaning surfaces.

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Section: Water Remediationmentioning

confidence: 99%

Section: Water Remediationmentioning

confidence: 99%

Visible-Light-Active TiO2-Based Hybrid Nanocatalysts for Environmental Applications

et al. 2017

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“…The carboxyl and carbonyl groups are critical for cleaving or perturbing DNA and are essential for reducing bacteria resistance. 72 Nevertheless, according to Dunlop et al 73 and Fiorentino et al 74 ARB can be sub-lethally injured and upon recovery could act as potential reservoirs for the spread of antibacterial resistance in the environment. When pathogens are exposed to a sufficient amount of UV-C irradiation, pathogens are inactivated, the inactivation relies primarily on the photochemical induction of lesions in the genomic DNA of the organisms but some mechanisms can favour bacterial re-growth by reversing the DNA damage.…”

Section: Ecotoxicity Assessmentmentioning

confidence: 99%

UV‐C‐driven oxidation of ciprofloxacin in conventionally treated urban wastewater: degradation kinetics, ecotoxicity and phytotoxicity assessment and inactivation of ciprofloxacin‐resistant Escherichia coli

Boudriche

Michael-Kordatou

Michael

et al. 2016

J of Chemical Tech & Biotech

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BACKGROUND This study aims at evaluating the degradation of the antibiotic ciprofloxacin (CIP) in urban wastewater effluents using a UV‐C‐driven oxidation processes in the presence of hydrogen peroxide. Under the optimum experimental conditions, the phytotoxicity and ecotoxicity of the treated samples were investigated against one plant species (Sinapis alba) and a crustacean (Daphnia magna), respectively. The efficiency of the process to remove E. coli and ciprofloxacin‐resistant E. coli was also assessed. RESULTS Complete degradation of CIP was achieved within 15 min of treatment under the optimum concentration of the oxidant ([H2O2] = 10 mg L−1). The degradation rate of the antibiotic fitted pseudo‐first‐order kinetics. An increase in both shoot inhibition and root inhibition was observed, until 60 min of treatment, beyond which, the phytotoxic effect was eliminated. The results demonstrated the ability of the UV‐C process to reduce the toxicity towards D. magna by 40%, comparatively, to the untreated wastewater. The inactivation of E. coli and CIP‐resistant E. coli was achieved within 2 min of treatment. CONCLUSIONS The UV‐C/H2O2 process was successfully applied for the removal of CIP at low environmental concentration level. The treatment process was able to achieve a significant reduction of phyto‐ and eco‐toxic effects, as well as E. coli harbouring resistance to CIP. © 2016 Society of Chemical Industry

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“…Therefore, interest in controlling the spread of antibiotic-resistant bacteria through different chemical or physical disinfection methods is growing (Fontes et al 2012;Martro et al 2003;Norton et al 2013;Wisplinghoff et al 2007). Among such techniques, photocatalytic oxidation (PCO) by titanium dioxide (TiO 2 ) irradiated with ultraviolet (UV) or visible light has demonstrated good bactericidal effects on several antibiotic-resistant species, including Escherichia coli (Fiorentino et al 2015;Xiong and Hu 2013), Staphylococcus aureus (Chen et al 2008;Cho et al 2007;Tsai et al 2010), Streptococcus pyogenes (Chen et al 2008), Acinetobacter baumannii (Cheng et al 2009;Tsai et al 2010), and Enterococcus faecalis (Tsai et al 2010). These results have suggested that susceptibility to TiO 2 is highly species-dependent.…”

Section: Introductionmentioning

confidence: 99%

Altered susceptibility to the bactericidal effect of photocatalytic oxidation by TiO2 is related to colistin resistance development in Acinetobacter baumannii

Tseng

Tsai

et al. 2016

Appl Microbiol Biotechnol

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Multidrug-resistant Acinetobacter baumannii is a well-documented pathogen associated with hospital-acquired infections. In addition to multidrug resistance, A. baumannii can also become resistant to colistin, the antibiotic treatment of last resort, by the loss of the lipopolysaccharide from its outer membrane. Here, we demonstrate that the development of colistin resistance also increases the resistance of A. baumannii to titanium dioxide (TiO2) photocatalysis. Both colistin-sensitive A. baumannii (CSAB) and colistin-resistant A. baumannii (CRAB) were inactivated by TiO2 when irradiated by ultraviolet A (UV-A). The resistance of CRAB to TiO2 photocatalysis was 1.5 times higher than that of CSAB, as determined by either culture assay or quantification of leaked proteins after photocatalysis (p < 0.05). The results of two-dimensional gel electrophoresis led to the speculation that the high resistance of CRAB may be associated with a lack of sensitive targets and oxidative enzymes. This hypothesis was confirmed by antimicrobial assays with 25 mM hydrogen peroxide (H2O2) and 1.07 mM sodium hypochlorite (NaClO). CRAB was significantly more resistant to H2O2 and NaClO treatment than CSAB (p < 0.01), consistent with the results of the TiO2 inactivation experiment. Therefore, the antibiotic resistance profiles of bacterial strains should be considered before the use of strains as indicators to represent sanitary quality after TiO2 photocatalysis.

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Inactivation and regrowth of multidrug resistant bacteria in urban wastewater after disinfection by solar-driven and chlorination processes

Cited by 126 publications

References 38 publications

Visible-Light-Active TiO2-Based Hybrid Nanocatalysts for Environmental Applications

Visible-Light-Active TiO2-Based Hybrid Nanocatalysts for Environmental Applications

UV‐C‐driven oxidation of ciprofloxacin in conventionally treated urban wastewater: degradation kinetics, ecotoxicity and phytotoxicity assessment and inactivation of ciprofloxacin‐resistant Escherichia coli

Altered susceptibility to the bactericidal effect of photocatalytic oxidation by TiO2 is related to colistin resistance development in Acinetobacter baumannii

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