Biofilm and Siderophore Effects on Secondary Waste Water Disinfection

Saidi, Nurdin; Kouki, Saoussen; Mehri, Inès; Rejeb, A. Ben; Belila, Abdelaziz; Hassen, A.; Ouzari, Hadda

doi:10.1007/s00284-011-9983-4

Cited by 7 publications

(3 citation statements)

References 20 publications

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“…The batch laboratory UV‐device was built in cooperation with Guy Daric (Aubervilliers, France) and previously described by Saidi et al . Calculation of germicidal doses was estimated as the product of radiation intensity and time according to the formula proposed by Hassen et al .…”

Section: Methodsmentioning

confidence: 99%

Influence of Biological Treatment and Ultraviolet Disinfection System on Pseudomonas spp. Diversity in Wastewater as Assessed by Denaturing Gradient Gel Electrophoresis

Mehri

Turki

Chérif

et al. 2013

CLEAN Soil Air Water

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Biological treatment methods use natural processes of ubiquitous living organisms to improve or upgrade the quality of a wastewater. To investigate the dominance of Pseudomonas spp. community in untreated and treated wastewater from full-scale biodiscs treatment plant, PCR-denaturing gradient gel electrophoresis coupled with sequence analysis of 16S rRNA gene fragments from dominant bands, were performed. The Pseudomonas species distribution over the total treatment process and over seasons (summer and winter) was obtained by comparing the denaturing gradient gel electrophoresis (DGGE) patterns to a normalized mix of nine reference Pseudomonas strains. Results indicated that Pseudomonas putida and Pseudomonas fluorescens strains showed dominance in wastewater, remarkable stability in the biofilm and resistance to UV irradiation. A reduction of Pseudomonas aeruginosa in treated wastewater was also observed. In addition, climatic and operational conditions results in selection of microbial community. The high temperature and intense solar radiation contribute to the total absence of the Pseudomonas syringae strain. In this work, the effect of increasing UV 254 germicidal dose on the Pseudomonas community in secondary treated wastewater effluent was also tested. At a dose of 1200 mWs/cm 2 , total disappearance of the band corresponding to P. aeruginosa, was noted. The DGGE approach can be used as an effective method to assess directly the Pseudomonas community shifts in studied wastewater treatment plant.

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Section: Methodsmentioning

confidence: 99%

Influence of Biological Treatment and Ultraviolet Disinfection System on Pseudomonas spp. Diversity in Wastewater as Assessed by Denaturing Gradient Gel Electrophoresis

Mehri

Turki

Chérif

et al. 2013

CLEAN Soil Air Water

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Section: Discussionmentioning

confidence: 99%

“…This could be explained by the ability of both Pa_15442 and Pa_9027 to produce hydrophobic siderophores (e.g., pyochelin and pyoverdine) with high affinity for the bacterial outer membrane. [55][56][57][58] Other possible explanations could include the production of hydrophobic EVs, which in Pa_9027 has been shown to occur efficiently under stressful conditions. [39] We show that modifying the physicochemical/electrostatic properties of PDMS (micro-Cu, SHB nano-HfO 2 , and SHB nano-Cu) resulted in both species-and strain-dependent variations on adhesion efficiency on the fabricated composites.…”

Section: Discussionmentioning

confidence: 99%

Superhydrophobic Copper‐Composite Surfaces Exert Antibacterial Effects against Gram‐Negative and ‐Positive Bacteria

Mirmohammadi

Savijoki

Hoshian

et al. 2023

Adv Materials Inter

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Copper shows a high promise in developing biomedical materials with antibacterial effect. The antibacterial effect can be enhanced by nanostructured surfaces with superhydrophobic properties, which reduce the solid contact area available for bacterial adhesion and adherent growth. Here, three structured surfaces are fabricated to test the combined effect of copper and superhydrophobicity for antibacterial effects. One of the samples is superhydrophobic but does not contain copper, one contains copper but is not superhydrophobic, and the third is both superhydrophobic and contained copper. The antibiofilm and bactericidal effects of these samples are tested against medically important Gram‐positive and ‐negative bacteria including Staphylococcus aureus (S. aureus), Staphylococcus epidermidis (S. epidermidis), and Pseudomonas aeruginosa (P. aeruginosa). The findings indicate that copper alone without superhydrophobicity, while decreasing the cell viability in most of the tested species, supports remarkably more biomass compared to the reference sample. The superhydrophobic and copper bearing samples, while allowing adherent growth to take place, provide the greatest bactericidal effect against two P. aeruginosa strains, and both the antibiofilm and/or bactericidal effects against S. aureus and S. epidermidis. Thus, this study reports that nanostructured materials, combining superhydrophobicity with copper, can be the method of choice to neutralize pathogens with different cell‐wall structures and surface components mediating adherent growth.

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Biofilms in bioremediation and wastewater treatment: characterization of bacterial community structure and diversity during seasons in municipal wastewater treatment process

Turki

Mehri

Lajnef

et al. 2016

Environ Sci Pollut Res

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The bacterial community structure and diversity were assessed at the scale of rotating biodisk procedure (RB) in a semi-industrial pilot plant. As well, the Salmonella community was particularly monitored, and the effects of ultraviolet (UV-C) on the bacterial community were studied. The identification of dominant bacteria revealed the presence of beneficial and useful species that could play an important role in the process of wastewater purification. Several species as Enterobacter agglomerans, Cronobacter sakazakii, and Pantoea agglomerans known for their bioremediation activities were revealed in the majority of biofilm samples. Common detection of Salmonella community provides evidence that the RB system did not seriously affect Salmonella. Furthermore, the investigation on the (UV)-C inactivation of the whole bacterial community, in secondary treated wastewater, showed variable UV resistance results. No Salmonella detection was registered at a dose of around 1440 mW s cm since a total disappearance of Salmonella was recorded.

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Biofilm and Siderophore Effects on Secondary Waste Water Disinfection

Cited by 7 publications

References 20 publications

Influence of Biological Treatment and Ultraviolet Disinfection System on Pseudomonas spp. Diversity in Wastewater as Assessed by Denaturing Gradient Gel Electrophoresis

Influence of Biological Treatment and Ultraviolet Disinfection System on Pseudomonas spp. Diversity in Wastewater as Assessed by Denaturing Gradient Gel Electrophoresis

Superhydrophobic Copper‐Composite Surfaces Exert Antibacterial Effects against Gram‐Negative and ‐Positive Bacteria

Biofilms in bioremediation and wastewater treatment: characterization of bacterial community structure and diversity during seasons in municipal wastewater treatment process

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