Search results for: Barth F. Smets

Items from 1 to 20 out of 85 results

article

Coupling pathway prediction and fluorescence spectroscopy to assess the impact of auxiliary substrates on micropollutant biodegradation

Anna‐Ricarda Schittich, Kathrin Fenner, Colin A. Stedmon, Jianxin Xu, more

Environmental Microbiology > 26 > 2 > n/a - n/a

Some bacteria can degrade organic micropollutants (OMPs) as primary carbon sources. Due to typically low OMP concentrations, these bacteria may benefit from supplemental assimilation of natural substrates present in the pool of dissolved organic matter (DOM). The biodegradability of such auxiliary substrates and the impacts on OMP removal are tightly linked to biotransformation pathways. Here, we...

article

IncHI1A plasmids potentially facilitate horizontal flow of antibiotic resistance genes to pathogens in microbial communities of urban residential sewage

Asmus K. Olesen, Rafael Pinilla‐Redondo, Mads F. Hansen, Jakob Russel, more

Molecular Ecology > 31 > 5 > 1595 - 1608

Horizontal gene transfer via plasmids is important for the dissemination of antibiotic resistance genes among medically relevant pathogens. Specifically, the transfer of IncHI1A plasmids is believed to facilitate the spread of antibiotic resistance genes, such as carbapenemases, within the clinically important family Enterobacteriaceae. The microbial community of urban wastewater treatment plants...

article

Guild Composition of Root-Associated Bacteria Changes with Increased Soil Contamination

Cairn S. Ely, Barth F. Smets

Microbial Ecology > 2019 > 78 > 2 > 416-427

The interaction of plants and root-associated bacteria encourage the removal of soil contaminants. Engineers and scientists have looked at this phenomenon as a possible means of soil treatment (rhizodegradation). In this study, root-associated bacteria were isolated and selected for growth on a model soil contaminant: polycyclic aromatic hydrocarbons. Isolates were compared genetically to see how...

article

Methanotrophic contribution to biodegradation of phenoxy acids in cultures enriched from a groundwater-fed rapid sand filter

Aikaterini Papadopoulou, Mathilde J. Hedegaard, Arnaud Dechesne, Hans-Jørgen Albrechtsen, more

Applied Microbiology and Biotechnology > 2019 > 103 > 2 > 1007-1019

Drinking water supply is in many parts of the world based on groundwater. Groundwater often contains methane, which can be oxidized by methanotrophs upon aeration. Sand from rapid sand filters fed with methane-rich groundwater can remove some pesticides (Hedegaard and Albrechtsen in Water Res 48:71–81, 2014). We enriched methanotrophs from filter sand and investigated whether they could drive the...

article

Nitrous oxide emissions from biofilm processes for wastewater treatment

Fabrizio Sabba, Akihiko Terada, George Wells, Barth F. Smets, more

Applied Microbiology and Biotechnology > 2018 > 102 > 22 > 9815-9829

This paper discusses the microbial basis and the latest research on nitrous oxide (N₂O) emissions from biofilms processes for wastewater treatment. Conditions that generally promote N₂O formation in biofilms include (1) low DO values, or spatial DO transitions from high to low within the biofilm; (2) DO fluctuations within biofilm due to varying bulk DO concentrations or varying substrate concentrations;...

article

Does universal 16S rRNA gene amplicon sequencing of environmental communities provide an accurate description of nitrifying guilds?

Vaibhav Diwan, Hans-Jørgen Albrechtsen, Barth F. Smets, Arnaud Dechesne

Journal of Microbiological Methods > 2018 > 151 > C > 28-34

Universal (i.e., targeting most bacteria/prokaryotes) 16S rRNA gene based amplicon sequencing is widely used for assessing microbial communities due to its low cost, time efficiency, and ability to provide a full overview of the community. However, it is currently unclear if it can yield reliable information on specific microbial guilds, as obtained by using primer sets targeting functional genes...

article

Reactor staging influences microbial community composition and diversity of denitrifying MBBRs- Implications on pharmaceutical removal

Elena Torresi, Arda Gülay, Fabio Polesel, Marlene M. Jensen, more

Water Research > 2018 > 138 > C > 333-345

The subdivision of biofilm reactor in two or more stages (i.e., reactor staging) represents an option for process optimisation of biological treatment. In our previous work, we showed that the gradient of influent organic substrate availability (induced by the staging) can influence the microbial activity (i.e., denitrification and pharmaceutical biotransformation kinetics) of a denitrifying three-stage...

article

The pH dependency of N‐converting enzymatic processes, pathways and microbes: effect on net N₂O production

Jan‐Michael Blum, Qingxian Su, Yunjie Ma, Borja Valverde‐Pérez, more

Environmental Microbiology > 20 > 5 > 1623 - 1640

Nitrous oxide (N₂O) is emitted during microbiological nitrogen (N) conversion processes, when N₂O production exceeds N₂O consumption. The magnitude of N₂O production vs. consumption varies with pH and controlling net N₂O production might be feasible by choice of system pH. This article reviews how pH affects enzymes, pathways and microorganisms that are involved in N‐conversions in water engineering...

article

Comammox Nitrospira are abundant ammonia oxidizers in diverse groundwater‐fed rapid sand filter communities

Susan Jane Fowler, Alejandro Palomo, Arnaud Dechesne, Paul D. Mines, more

Environmental Microbiology > 20 > 3 > 1002 - 1015

The recent discovery of completely nitrifying Nitrospira demands a re‐examination of nitrifying environments to evaluate their contribution to nitrogen cycling. To approach this challenge, tools are needed to detect and quantify comammox Nitrospira. We present primers for the simultaneous quantification and diversity assessement of both comammox Nitrospira clades. The primers cover a wide range of...

article

Nitrous oxide production in intermittently aerated Partial Nitritation-Anammox reactor: oxic N2O production dominates and relates with ammonia removal rate

Jan-Michael Blum, Marlene Mark Jensen, Barth F. Smets

Chemical Engineering Journal > 2018 > 335 > C > 458-466

Emissions of the greenhouse gas nitrous oxide from the Partial Nitritation-Anammox process are of concern and can determine the carbon footprint of the process. In order to reduce nitrous oxide emissions intermittent aeration regimes have been shown to be a promising mode of operation, possibly due to an effective control of accumulation of nitrogen intermediates. However, due to frequent changes...

article

Evidence of co-metabolic bentazone transformation by methanotrophic enrichment from a groundwater-fed rapid sand filter

Mathilde J. Hedegaard, Hélène Deliniere, Carsten Prasse, Arnaud Dechesne, more

Water Research > 2018 > 129 > C > 105-114

The herbicide bentazone is recalcitrant in aquifers and is therefore frequently detected in wells used for drinking water production. However, bentazone degradation has been observed in filter sand from a rapid sand filter at a waterworks with methane-rich groundwater. Here, the association between methane oxidation and removal of bentazone was investigated with a methanotrophic enrichment culture...

article

Density and distribution of nitrifying guilds in rapid sand filters for drinking water production: Dominance of Nitrospira spp.

Karolina Tatari, Sanin Musovic, Arda Gülay, Arnaud Dechesne, more

Water Research > 2017 > 127 > C > 239-248

We investigated the density and distribution of total bacteria, canonical Ammonia Oxidizing Bacteria (AOB) (Nitrosomonas plus Nitrosospira), Ammonia Oxidizing Archaea (AOA), as well as Nitrobacter and Nitrospira in rapid sand filters used for groundwater treatment. To investigate the spatial distribution of these guilds, filter material was sampled at four drinking water treatment plants (DWTPs) in...

article

Calibration of the comprehensive NDHA-N2O dynamics model for nitrifier-enriched biomass using targeted respirometric assays

Carlos Domingo-Félez, Maria Calderó-Pascual, Gürkan Sin, Benedek G. Plósz, more

Water Research > 2017 > 126 > C > 29-39

The NDHA model comprehensively describes nitrous oxide (N₂O) producing pathways by both autotrophic ammonium oxidizing and heterotrophic bacteria. The model was calibrated via a set of targeted extant respirometric assays using enriched nitrifying biomass from a lab-scale reactor. Biomass response to ammonium, hydroxylamine, nitrite and N₂O additions under aerobic and anaerobic conditions were tracked...

article

Counter-diffusion biofilms have lower N2O emissions than co-diffusion biofilms during simultaneous nitrification and denitrification: Insights from depth-profile analysis

Co Thi Kinh, Toshikazu Suenaga, Tomoyuki Hori, Shohei Riya, more

Water Research > 2017 > 124 > C > 363-371

The goal of this study was to investigate the effectiveness of a membrane-aerated biofilm reactor (MABR), a representative of counter-current substrate diffusion geometry, in mitigating nitrous oxide (N₂O) emission. Two laboratory-scale reactors with the same dimensions but distinct biofilm geometries, i.e., a MABR and a conventional biofilm reactor (CBR) employing co-current substrate diffusion geometry,...

article

Diffusion and sorption of organic micropollutants in biofilms with varying thicknesses

Elena Torresi, Fabio Polesel, Kai Bester, Magnus Christensson, more

Water Research > 2017 > 123 > C > 388-400

Solid-liquid partitioning is one of the main fate processes determining the removal of micropollutants in wastewater. Little is known on the sorption of micropollutants in biofilms, where molecular diffusion may significantly influence partitioning kinetics. In this study, the diffusion and the sorption of 23 micropollutants were investigated in novel moving bed biofilm reactor (MBBR) carriers with...

article

Low nitrous oxide production through nitrifier-denitrification in intermittent-feed high-rate nitritation reactors

Qingxian Su, Chun Ma, Carlos Domingo-Félez, Anne Sofie Kiil, more

Water Research > 2017 > 123 > C > 429-438

Nitrous oxide (N₂O) production from autotrophic nitrogen conversion processes, especially nitritation systems, can be significant, requires understanding and calls for mitigation. In this study, the rates and pathways of N₂O production were quantified in two lab-scale sequencing batch reactors operated with intermittent feeding and demonstrating long-term and high-rate nitritation. The resulting reactor...

article

Nitrotoga is selected over Nitrospira in newly assembled biofilm communities from a tap water source community at increased nitrite loading

Marta Kinnunen, Arda Gülay, Hans‐Jørgen Albrechtsen, Arnaud Dechesne, more

Environmental Microbiology > 19 > 7 > 2785 - 2793

Community assembly is a central topic in microbial ecology: how do assembly processes interact and what is the relative contribution of stochasticity and determinism? Here, we exposed replicate flow‐through biofilm systems, fed with nitrite‐supplemented tap water, to continuous immigration from a source community, present in the tap water, to determine the extent of selection and neutral processes...

article

Evaluating robustness of a diesel-degrading bacterial consortium isolated from contaminated soil

Mateusz Sydow, Mikołaj Owsianiak, Zuzanna Szczepaniak, Grzegorz Framski, more

New Biotechnology > 2016 > 33 > 6 > 852-859

It is not known whether diesel-degrading bacterial communities are structurally and functionally robust when exposed to different hydrocarbon types. Here, we exposed a diesel-degrading consortium to model either alkanes, cycloalkanes or aromatic hydrocarbons as carbon sources to study its structural resistance. The structural resistance was low, with changes in relative abundances of up to four orders...

article

Harvesting microalgae using activated sludge can decrease polymer dosing and enhance methane production via co-digestion in a bacterial-microalgal process

Dorottya S. Wágner, Maria Radovici, Barth F. Smets, Irini Angelidaki, more

Algal Research > 2016 > 20 > C > 197-204

Third generation biofuels, e.g. biofuels production from algal biomass, have gained attention due to increased interest on global renewable energy. However, crop-based biofuels compete with food production and should be avoided. Microalgal cultivation for biofuel production offers an alternative to crops and can become economically viable when combined with the use of used water resources. Besides...

article

Heterotrophs are key contributors to nitrous oxide production in activated sludge under low C‐to‐N ratios during nitrification—Batch experiments and modeling

Carlos Domingo‐Félez, Carles Pellicer‐Nàcher, Morten S. Petersen, Marlene M. Jensen, more

Biotechnology and Bioengineering > 114 > 1 > 132 - 140

Nitrous oxide (N₂O), a by‐product of biological nitrogen removal during wastewater treatment, is produced by ammonia‐oxidizing bacteria (AOB) and heterotrophic denitrifying bacteria (HB). Mathematical models are used to predict N₂O emissions, often including AOB as the main N₂O producer. Several model structures have been proposed without consensus calibration procedures. Here, we present a new experimental...

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Search results for: Barth F. Smets

Coupling pathway prediction and fluorescence spectroscopy to assess the impact of auxiliary substrates on micropollutant biodegradation

IncHI1A plasmids potentially facilitate horizontal flow of antibiotic resistance genes to pathogens in microbial communities of urban residential sewage

Guild Composition of Root-Associated Bacteria Changes with Increased Soil Contamination

Methanotrophic contribution to biodegradation of phenoxy acids in cultures enriched from a groundwater-fed rapid sand filter

Nitrous oxide emissions from biofilm processes for wastewater treatment

Does universal 16S rRNA gene amplicon sequencing of environmental communities provide an accurate description of nitrifying guilds?

Reactor staging influences microbial community composition and diversity of denitrifying MBBRs- Implications on pharmaceutical removal

The pH dependency of N‐converting enzymatic processes, pathways and microbes: effect on net N₂O production

Comammox Nitrospira are abundant ammonia oxidizers in diverse groundwater‐fed rapid sand filter communities

Nitrous oxide production in intermittently aerated Partial Nitritation-Anammox reactor: oxic N2O production dominates and relates with ammonia removal rate

Evidence of co-metabolic bentazone transformation by methanotrophic enrichment from a groundwater-fed rapid sand filter

Density and distribution of nitrifying guilds in rapid sand filters for drinking water production: Dominance of Nitrospira spp.

Calibration of the comprehensive NDHA-N2O dynamics model for nitrifier-enriched biomass using targeted respirometric assays

Counter-diffusion biofilms have lower N2O emissions than co-diffusion biofilms during simultaneous nitrification and denitrification: Insights from depth-profile analysis

Diffusion and sorption of organic micropollutants in biofilms with varying thicknesses

Low nitrous oxide production through nitrifier-denitrification in intermittent-feed high-rate nitritation reactors

Nitrotoga is selected over Nitrospira in newly assembled biofilm communities from a tap water source community at increased nitrite loading

Evaluating robustness of a diesel-degrading bacterial consortium isolated from contaminated soil

Harvesting microalgae using activated sludge can decrease polymer dosing and enhance methane production via co-digestion in a bacterial-microalgal process

Heterotrophs are key contributors to nitrous oxide production in activated sludge under low C‐to‐N ratios during nitrification—Batch experiments and modeling

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