Influence of hydraulic regimes and Cl<sub>2</sub>/NH<sub>3</sub>-N mass ratios on the bacterial structure and composition in an experimental flow cell chloraminated drinking water system

Shi, Yi; Babatunde, Akintunde; Bockelmann-Evans, Bettina Nicole; Webster, Gordon

doi:10.1039/c9ew00015a

Cited by 8 publications

(6 citation statements)

References 72 publications

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“…Diversity and richness did not influenced by hydraulic parameters of the drippers. This is not consistent with Shi et al (2019) who studied the effect of hydraulic regime on biofilm evolved in pipes from drinking water distribution systems. However, these authors used a wider range of flow rates (120 to 600 l.h -1 ).…”

Section: Discussioncontrasting

confidence: 85%

Hydrodynamic effect on biofouling of milli-labyrinth channel and bacterial communities in drip irrigation systems fed with reclaimed wastewater

Lequette

Ait-Mouheb

Wéry

2020

Science of The Total Environment

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Section: Discussioncontrasting

confidence: 85%

Hydrodynamic effect on biofouling of milli-labyrinth channel and bacterial communities in drip irrigation systems fed with reclaimed wastewater

Lequette

Ait-Mouheb

Wéry

2020

Science of The Total Environment

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“…Results indicate that the dominant bacterial phyla within biofilms incubated with drinking water were Alphaproteobacteria, Betaproteobacteria and Gammaproteobacteria. Members of the Proteobacteria have been reported previously as the dominant constituents within DWDS biofilms [12,30,33]. The bacterial phylum Cyanobactera was also found to be present, although only on the S-HDPE coupon at high flow conditions.…”

Section: Biofilm Bacterial Community Structurementioning

confidence: 53%

Impact of flow hydrodynamics and pipe material properties on biofilm development within drinking water systems

Cowle

Webster²,

Babatunde

et al. 2019

Environmental Technology

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The aim of this study was to investigate the combined impact of flow hydrodynamics and pipe material on biofilm development in drinking water distribution systems (DWDS). Biofilms were formed on four commonly used pipe materials (namely polyvinyl chloride, polypropylene, structured wall high-density polyethylene and solid wall high-density polyethylene) within a series of purpose built flow cell reactors at two different flow regimes. Results indicate that varying amounts of microbial material with different morphologies were present depending on the pipe material and conditioning. The amount of microbial biomass was typically greater for the biofilms conditioned at lower flows. Whereas, biofilm development was inhibited at higher flows indicating shear forces imposed by flow conditions were above the critical levels for biofilm attachment. Alphaproteobacteria was the predominant bacterial group within the biofilms incubated at low flow and represented 48% of evaluated phylotypes; whilst at higher flows, Betaproteobacteria (45%) and Gammaproteobacteria (33%) were the dominant groups. The opportunistic pathogens, Sphingomonas and Pseudomonas were found to be particularly abundant in biofilms incubated at lower flows, and only found within biofilms incubated at higher flows on the rougher materials assessed. This suggests that these bacteria have limited ability to propagate within biofilms under high shear conditions without sufficient protection (roughness). These findings expand on knowledge relating to the impact of surface roughness and flow hydrodynamics on biofilm development within DWDS.

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“…Diversity and richness did not influenced by hydraulic parameters of the drippers. This 504 is not consistent with Shi et al (2019) who studied the effect of hydraulic regime on biofilm 505 evolved in pipes from drinking water distribution systems. However, these authors used a wider 506 range of flow rates (120 to 600 l.h -1 ).…”

Section: Discussion 435mentioning

confidence: 79%

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

Lequette

Ait-Mouheb

Wéry

2020

Preprint

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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.

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Influence of hydraulic regimes and Cl₂/NH₃-N mass ratios on the bacterial structure and composition in an experimental flow cell chloraminated drinking water system

Abstract: A novel microbial analysis regarding impacts of hydraulic regimes and Cl2/NH3-N mass ratios is provided for an experimental chloraminated DWDS experiencing nitrification.

Cited by 8 publications

References 72 publications

Hydrodynamic effect on biofouling of milli-labyrinth channel and bacterial communities in drip irrigation systems fed with reclaimed wastewater

Hydrodynamic effect on biofouling of milli-labyrinth channel and bacterial communities in drip irrigation systems fed with reclaimed wastewater

Impact of flow hydrodynamics and pipe material properties on biofilm development within drinking water systems

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

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Influence of hydraulic regimes and Cl2/NH3-N mass ratios on the bacterial structure and composition in an experimental flow cell chloraminated drinking water system

Abstract: A novel microbial analysis regarding impacts of hydraulic regimes and Cl2/NH3-N mass ratios is provided for an experimental chloraminated DWDS experiencing nitrification.

Cited by 8 publications

References 72 publications

Hydrodynamic effect on biofouling of milli-labyrinth channel and bacterial communities in drip irrigation systems fed with reclaimed wastewater

Hydrodynamic effect on biofouling of milli-labyrinth channel and bacterial communities in drip irrigation systems fed with reclaimed wastewater

Impact of flow hydrodynamics and pipe material properties on biofilm development within drinking water systems

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

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Influence of hydraulic regimes and Cl₂/NH₃-N mass ratios on the bacterial structure and composition in an experimental flow cell chloraminated drinking water system