The effect of UV/H2O2 treatment on biofilm formation potential

Metz, Deborah H.; Reynolds, Kelly A.; Meyer, Maria; Dionysiou, D.D.

doi:10.1016/j.watres.2010.09.007

Cited by 22 publications

(9 citation statements)

References 26 publications

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“…A hypothesis was considered that treatment with polychromatic UV enhances bacterial growth because of formation of assimilable organic carbon. 58 However a control study examining bacterial growth in treated vs untreated water with no antibiotics proved that no difference was obvious for the purpose of the assay performed in this study. It is therefore likely that other antibiotics experience interference from the constituents in the effluent matrix, similar to the effect described for doxycycline, but not to the same extent with most of the points still having the 1:1 line within their error bars.…”

Section: ■ Materials and Methodsmentioning

confidence: 70%

“…Some of the other compounds had points also falling below 1:1 line, especially in effluent undergoing treatment with polychromatic UV. A hypothesis was considered that treatment with polychromatic UV enhances bacterial growth because of formation of assimilable organic carbon . However a control study examining bacterial growth in treated vs untreated water with no antibiotics proved that no difference was obvious for the purpose of the assay performed in this study.…”

Section: Resultsmentioning

confidence: 87%

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Degradation of Antibiotic Activity during UV/H₂O₂ Advanced Oxidation and Photolysis in Wastewater Effluent

Keen

Linden

2013

Environ. Sci. Technol.

143

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Trace levels of antibiotics in treated wastewater effluents may present a human health risk due to the rise of antibacterial activity in the downstream environments. Advanced oxidation has a potential to become an effective treatment technology for transforming trace antibiotics in wastewater effluents, but residual or newly generated antibacterial properties of transformation products are a concern. This study demonstrates the effect of UV photolysis and UV/H2O2 advanced oxidation on transformation of 6 antibiotics, each a representative of a different structural class, in pure water and in two different effluents and reports new or confirmatory photolysis quantum yields and hydroxyl radical rate constants. The decay of the parent compound was monitored with HPLC/ITMS, and the corresponding changes in antibacterial activity were measured using bacterial inhibition assays. No antibacterially active products were observed following treatment for four of the six antibiotics (clindamycin, ciprofloxacin, penicillin-G, and trimethoprim). The remaining two antibiotics (erythromycin and doxycycline) showed some intermediates with antibacterial activity at low treatment doses. The antibacterially active products lost activity as the UV dose increased past 500 mJ/cm(2). Active products were observed only in wastewater effluents and not in pure water, suggesting that complex secondary reactions controlled by the composition of the matrix were responsible for their formation. This outcome emphasizes the importance of bench-scale experiments in realistic water matrices. Most importantly, the results indicate that photosensitized processes during high dose wastewater disinfection may be creating antibacterially active transformation products from some common antibiotics.

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Section: ■ Materials and Methodsmentioning

confidence: 70%

Section: Resultsmentioning

confidence: 87%

Degradation of Antibiotic Activity during UV/H₂O₂ Advanced Oxidation and Photolysis in Wastewater Effluent

Keen

Linden

2013

Environ. Sci. Technol.

143

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“…Previous research has indicated that the viability of biofilms can be enhanced when located downstream of a UV-based advanced oxidation process. 28 The biofiltration polishing step can also reduce the AOC before the treated water is released into the environment or distribution network in the case of wastewater reuse or drinking water treatment scenarios. In addition to chemical oxidation activity, UV/H 2 O 2 AOP at a wastewater treatment plant would provide very high levels of effluent disinfection, effectively eliminating the need for any additional disinfection step.…”

Section: Environmental Science and Technologymentioning

confidence: 99%

Enhanced Biodegradation of Carbamazepine after UV/H₂O₂ Advanced Oxidation

Keen

Baik

Linden

et al. 2012

Environ. Sci. Technol.

155

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Carbamazepine is one of the most persistent pharmaceutical compounds in wastewater effluents due to its resistance to biodegradation-based conventional treatment. Advanced oxidation can efficiently degrade carbamazepine, but the toxicity and persistence of the oxidation products may be more relevant than the parent. This study sets out to determine whether the products of advanced oxidation of carbamazepine can be biotransformed and ultimately mineralized by developing a novel methodology to assess these sequential treatment processes. The methodology traces the transformation products of the (14)C-labeled carbamazepine during UV/hydrogen peroxide advanced oxidation and subsequent biotransformation by mixed, undefined cultures using liquid scintillation counting and liquid chromatography with radioactivity, mass spectrometry, and UV detectors. The results show that the oxidation byproducts of carbamazepine containing a hydroxyl or carbonyl group can be fully mineralized by a mixed bacterial inoculum. A tertiary treatment approach that includes oxidation and biotransformation has the potential to synergistically mineralize persistent pharmaceutical compounds in wastewater treatment plant effluents. The methodology developed for this study can be applied to assess the mineralization potential of other persistent organic contaminants.

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“…All these organisms are found in varying proportions in the systems, usually fixed to the surface of materials in the form of microcolonies mixed with corrosion products and inorganic precipitates, this assembly forming the biofilm [7]. Among the microorganisms get into the distribution systems, heterotrophic bacteria can be easily adapted to oligotrophic conditions even in the presence of a residual disinfectant and can represent up to 91% of the total biomass [29].…”

Section: Discussionmentioning

confidence: 99%

Health risks of water wells in the Moorish baths: correlation between pathogenic bacteria and determination of gradients of contamination

Ouardi¹,

Ennaji²,

Habib³

et al. 2014

IOSRJESTFT

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The emergence of pathogens in water cold of baths Moors served by wells have been chlorinated or not, is a major concern in terms of the public health industry and the public authorities concerned. Among these pathogens, some are of fecal origin (Escherichia coli, intestinal enterococci, anaerobic sulphite-reducing or Clostridia), while others live in the natural environment (Staphylococcus aureus, and Pseudomonas aeruginosa). In order to establish a risk analysis related to the presence of these pathogens, it is important to increase our knowledge on the ecology of these microorganisms and to develop analytical tools to achieve better health monitoring. In total 568 samples sanitary cold water during the four seasons, to evaluate by PCA (Principal Component Analysis) the bacteriological quality of pathogens and to define spatiotemporal and seasonal gradients of contamination. Thus, could be determined three groups of bacteriological contamination (i) Gr1 well Moorish baths which is moving towards a contamination by fecal indicators (E. coli, intestinal enterococci, anaerobic sulphite-reducing); (ii) Gr 2 wells Moorish baths which is moving towards a contamination with P. aeruginosa; (iii) Gr 3 wells Moorish baths which is moving towards a contamination by S. aureus. Also, a seasonal gradient of correlation between these pathogens increases slightly in the winter, spring and summer to autumn.

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The effect of UV/H2O2 treatment on biofilm formation potential

Cited by 22 publications

References 26 publications

Degradation of Antibiotic Activity during UV/H₂O₂ Advanced Oxidation and Photolysis in Wastewater Effluent

Degradation of Antibiotic Activity during UV/H₂O₂ Advanced Oxidation and Photolysis in Wastewater Effluent

Enhanced Biodegradation of Carbamazepine after UV/H₂O₂ Advanced Oxidation

Health risks of water wells in the Moorish baths: correlation between pathogenic bacteria and determination of gradients of contamination

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The effect of UV/H2O2 treatment on biofilm formation potential

Cited by 22 publications

References 26 publications

Degradation of Antibiotic Activity during UV/H2O2 Advanced Oxidation and Photolysis in Wastewater Effluent

Degradation of Antibiotic Activity during UV/H2O2 Advanced Oxidation and Photolysis in Wastewater Effluent

Enhanced Biodegradation of Carbamazepine after UV/H2O2 Advanced Oxidation

Health risks of water wells in the Moorish baths: correlation between pathogenic bacteria and determination of gradients of contamination

Contact Info

Product

Resources

About

Degradation of Antibiotic Activity during UV/H₂O₂ Advanced Oxidation and Photolysis in Wastewater Effluent

Degradation of Antibiotic Activity during UV/H₂O₂ Advanced Oxidation and Photolysis in Wastewater Effluent

Enhanced Biodegradation of Carbamazepine after UV/H₂O₂ Advanced Oxidation