Nathalie Wéry

Laboratoire de Biotechnologie de l'Environnement

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Nassim Aït-Mouheb

Université de Montpellier

Dominique Patureau

Laboratoire de Biotechnologie de l'Environnement

Jean‐Jacques Godon

Laboratoire de Biotechnologie de l'Environnement

Valérie Bru‐Adan

Laboratoire de Biotechnologie de l'Environnement

Anne‐Marie Pourcher

Institut Agro Rennes-Angers

Jean‐Philippe Steyer

Medical University of Graz

Amandine Galès

Laboratoire de Biotechnologie de l'Environnement

Jérôme Hamelin

Laboratoire de Biotechnologie de l'Environnement

Marc Héran

Université de Montpellier

Kévin Lequette

Gestion de l'Eau, Acteurs, Usages

Cooperative Institutions

Institut National de Recherche pour l'Agriculture, l'Alimentation et l'Environnement

108

Centre National de la Recherche Scientifique

Laboratoire de Biotechnologie de l'Environnement

Université de Montpellier

Institut National de la Recherche Agronomique

Institut de Recherche pour le Développement

Institut National de la Recherche Agronomique du Niger

Institut Agro Montpellier

Ifremer

Gestion de l'Eau, Acteurs, Usages

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Drip Irrigation Innovation: Efficiency and Biofilm Dynamics in a Micro-Irrigation System with Reclaimed Wastewater in the Field

Vincent Moulia Marc Héran Geoffroy Lesage Jérôme Hamelin Jérôme Pinta

The aim of this study was to evaluate the efficiency and biofouling of drip irrigation systems at the field scale during irrigation with treated wastewater. Six 100-m lines of commercial pipes with two dripper types (flow rate, Q, of 0.65 L.h-1 and 1.5 L.h-1, respectively) were monitored for four months. Different zones along the pipes were selected to evaluate the influence of hydrodynamical conditions (Reynolds number = 5400 to 0) on biofouling. Destructive methods involving the biofilm extraction by mechanical means, showed little biofilm development without significant differences in dry and organic matter content in function of the sampling location along the pipe or dripper flow rate (Q0.65 and Q1.5). These results were confirmed by non-destructive methods, such as optical coherence tomography, that nevertheless showed that biofouling concerned 15-20% of the total dripper labyrinth volume. Total organic carbon monitoring and its composition (by three-dimensional excitation and emission matrix fluorescence microscopy) showed that the biofilm did not significantly influence the organic matter nature. Our results indicated that the biological activity and biofilm development in irrigation systems were more affected by the environmental conditions, particularly water temperature, rather than flow conditions. This confirmed that treated wastewater with low organic content can be used in micro-irrigation systems without significant loss of efficiency, even in conditions requiring intensive irrigation, such as the Mediterranean climate.

Reclaimed water

10.2139/ssrn.4809858

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Estimating the bacterial source strength and the downwind influence of outdoor composting platforms

Yves Brunet Amandine Galès Jean‐Jacques Godon Nathalie Wéry

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Increasing flow rate reduces biofouling and colonization by filamentous bacteria in drippers fed with reclaimed wastewater

bioRxiv (Cold Spring Harbor Laboratory) (2020)

Kévin Lequette Nassim Aït-Mouheb Nathalie Wéry

Abstract The clogging of drippers due to the development of biofilms reduces the benefits and is an obstacle to the implementation of drip irrigation technology. The geometry of the dripper channel has an impact on the flow behaviours and head loss. The objective of this study was to analyse the influence of hydrodynamic parameters of three types of drippers (flow rates of 1, 2 and 4 l.h -1 ) fed by reclaimed wastewater on biofilm development kinetics and on the bacterial community. Using optical coherence tomography, we demonstrated that the inlet of the drippers (mainly the first baffle) and vortex zones are the most sensitive area for biofouling. Drippers with the lowest flow rate (1 l.h -1 ) and the smallest channel section were the favourable areas to biofouling. The low inlet velocity (0.34 m.s -1 ) in this type of dripper compared to 2 l.h -1 (0.61 m.s -1 ) and 4 l.h -1 (0.78 m.s -1 ) drippers can favour the deposition and development of biofilms. In addition, the water velocity influenced the structure of the bacterial communities in the biofilm. Low velocity (0.34 m.s -1 ) favoured the presence of Hydrogenophaga and Pseudoxanthomonas genera at the early stage of biofilm formation and filamentous bacteria belonging to Chloroflexi phylum at the end. So, maintaining a high flow rate and using drippers with a large flow cross-section is an effective way to control the development of biofilms by limiting the presence of filamentous bacteria.

Biofouling

Plug flow

Clogging

Reclaimed water

10.1101/2020.06.02.130013

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Dispersal of bioaerosols on composting facilities assessed using molecular techniques

HAL (Le Centre pour la Communication Scientifique Directe) (2014)

Nathalie Wéry Amandine Galès Karine Delabre H. Bacheley Jean‐Philippe Steyer

Indoor bioaerosol

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Evolution of antibiotic resistance along the treated wastewater-soil-plant continuum over two seasons of crop irrigation

Oriane Della‐Negra Marília Camotti Bastos Valérie Bru‐Adan Nassim Aït-Mouheb Dominique Patureau

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Pathogen decay or growth in anaerobic digesters: a question with no possible answer? Elements of understanding for non-microbiologists

HAL (Le Centre pour la Communication Scientifique Directe) (2017)

Jean‐Jacques Godon Nathalie Wéry Nicolas Bernet

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Thermococcus atlanticus sp. nov., a hyperthermophilic Archaeon isolated from a deep-sea hydrothermal vent in the Mid-Atlantic Ridge

Extremophiles (2003)

Marie‐Anne Cambon‐Bonavita F. Lesongeur Patricia Pignet Nathalie Wéry Christophe Lambert

Thermococcus

Mid-Atlantic Ridge

10.1007/s00792-003-0343-6

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Citations (12)

Microbial characteristics of biogas

Water Science & Technology (2008)

Marina Moletta Nathalie Wéry Jean‐Philippe Delgenès Jean‐Jacques Godon

The microbial diversity of biogas was analyzed in order to examine the aerosolization behavior of microorganisms. Six biogas samples were analyzed: five from mesophilic and thermophilic anaerobic digestors treating different wastes, and one from landfill. Epifluorescent microscopic counts revealed 10(6) prokarya m(-3). To assess the difference occuring in aerosolization, 498 biogas-borne 16S ribosomal DNA were analyzed and compared to published anaerobic digestor microbial diversity. Results show a large microbial diversity and strong discrepancy with digestor microbial diversity. Three different aerosolisation behaviour patterns can be identified: (i) that of non-aerosolized microorganisms, Deltaproteobacteria, Spirochaetes, Thermotogae, Chloroflexi phyla and sulfate-reducing groups, (ii) that of passively aerosolized microorganisms, including Actinobacteria, Firmicutes and Bacteroidetes phyla and (iii) that of preferentially aerosolized microorganisms, including Alphaproteobacteria, Betaproteobacteria, Gammaproteobacteria, as well as strictly aerobic and occasionally pathogenic species, presented high levels of aerosolization.

Aerosolization

Betaproteobacteria

Alphaproteobacteria

Biogas

10.2166/wst.2008.107

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Citations (5)

Survival of Listeria monocytogenes and Enterococcus faecium in sludge evaluated by real-time PCR and culture methods

Nathalie Wéry Anne‐Marie Pourcher V. Stan J.P. Delgenès F. Picard-Bonnaud

Enterococcus faecium

10.1111/j.1472-765x.2006.01946.x

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