Changes in the Bacterial Community Structure of Denitrifying Sludge from a Recirculating Aquaculture System (RAS) After Geosmin and 2-Methylisoborneol Enrichment

Azaria, Snir; Post, Anton F.; Rijn, Jaap van

doi:10.1007/s00284-019-01844-z

Cited by 5 publications

(4 citation statements)

References 47 publications

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“…The relative content of geoA ‐containing microorganisms was estimated to account for approximately 0.9% of the community in the water. This is similar to previously reported numbers (Azaria et al, 2020; Lukassen et al, 2017). As it is difficult to estimate the total amount of biofilm in fixed‐bed biofilters, and from other surfaces in the RAS, we have not attempted to estimate the major source of geosmin‐producing bacteria in RAS.…”

Section: Discussionsupporting

confidence: 93%

Impact of water quality parameters on geosmin levels and geosmin producers in European recirculating aquaculture systems

Lukassen

Menanteau–Ledouble

Jonge

et al. 2022

Journal of Applied Microbiology

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Aims Geosmin is associated with off‐flavour problems in recirculating aquaculture systems (RAS) and represents an economic problem for the aquaculture industry. This study aims at investigating factors influencing the composition of the bacterial microbiota, in particular the presence of geosmin producers and the environmental and farming factors favouring geosmin accumulation. Methods and Results Several water quality parameters were correlated to the composition of the microbiota with special emphasis on the presence of geosmin producers within 26 different RAS from four European countries. Three novel groups of geosmin‐producing bacteria were quantified to identify potential correlations with geosmin concentration. Conclusions The microbiome differed significantly between systems. However, phosphate levels, calcium levels and redox potential correlated to geosmin concentration in the water and the presence of the Actinomycetales geosmin‐producers but not with the presence of other groups of geosmin‐producing bacteria. Oxygen levels and conductivity were found to negatively correlate with geosmin concentration. A large proportion of the detected geosmin producers represented novel taxonomic groups not previously linked with this activity. Significance and Impact of the Study These results improve our understanding of the diversity of microbiota in RAS and the water quality parameters favouring the populations of geosmin‐producing bacteria and the production of geosmin.

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Section: Discussionsupporting

confidence: 93%

Impact of water quality parameters on geosmin levels and geosmin producers in European recirculating aquaculture systems

Lukassen

Menanteau–Ledouble

Jonge

et al. 2022

Journal of Applied Microbiology

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“…A numerical model was developed to describe the combined adsorption/biodegradation of MIB in the sludge [26]. In a later study, the enrichment of the sludge derived from the same RAS above with geosmin and MIB resulted in a significantly increased abundance of 12 distinct bacterial species [27].…”

Section: Removal Of Taste and Odor Molecules From Water In Fish Pondsmentioning

confidence: 99%

Removal of Emerging Contaminants by Degradation during Filtration: A Review of Experimental Procedures and Modeling

Undabeytia,

Jiménez-Barrera,

Nir

2023

Water

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Here, we review the efficient removal of organic micropollutants from water by degradation during filtration using specialized bacteria and enzymes. In both approaches, the filter provides essential binding sites where efficient degradation can occur. A model is presented that enables the simulation and prediction of the kinetics of filtration for a given pollutant concentration, flow rate, and filter dimensions and can facilitate the design of experiments and capacity estimates; it predicts the establishment of a steady state, during which the emerging concentrations of the pollutants remain constant. One method to remove cyanotoxins produced by Microcystis cyanobacteria, which pose a threat at concentrations above 1.0 µg L−1, is to use an activated granular carbon filter with a biofilm; this method resulted in the complete removal of the filtered toxins (5 µg L−1) during a long experiment (225 d). This system was analyzed using a model which predicted complete toxin removal when applied at a 10-fold-higher concentration. Enzymes are also used in filtration processes for the degradation of trace organic contaminants, mostly through the use of membrane bioreactors, where the enzyme is continuously introduced or maintained in the bioreactor, or it is immobilized on the membrane.

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“…The effect of low or high nitrate levels on off-flavor production has previously been studied (Schrader et al 2013), but in that study, no correlation was found. With only a few exceptions (Azaria et al 2020), the effect of denitrification on off-flavor accumulation has only rarely been a subject of research. According to our knowledge, this was the first experiment to study the concentrations of off-flavors in systems with woodchip bioreactor-based denitrification.…”

Section: Anions and Off-favorsmentioning

confidence: 99%

“…Only Schrader et al (2013) studied the effect of low and high nitrate content on off-flavors in the RAS, but observed no significant effect. Later, Azaria et al (2020) observed that among Betaproteobacteria genera, Thauera utilized terpenes to fuel denitrification as well as Comamonas and could utilize GSM and MIB as a carbon and energy source. As we were using a woodchip denitrification step, the formation of off-flavors was of interest in this study.…”

Section: Introductionmentioning

confidence: 99%

Efficient water treatment achieved in recirculating aquaculture system using woodchip denitrification and slow sand filtration

Lindholm‐Lehto

Pulkkinen

Kiuru

et al. 2021

Environ Sci Pollut Res

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For a recirculating aquaculture system (RAS), a passive water treatment system was designed for efficient discharge nutrient removal and water reuse in RAS production. Denitrification in a woodchip bioreactor filled with birch wood (Betula pendula) followed by sand filtration was introduced into a side-loop of an experimental RAS rearing rainbow trout (Oncorhynchus mykiss). Denitrification efficiency remained high (96%) throughout the experiment and reached a nitrogen removal rate of 15 g NO3-N m−3 per day. Sand filtration was used to remove dissolved and particulate matter and improve water quality before being returned to water circulation. To ensure the absence of harmful substances in the system, heavy metals were quantified. Additionally, off-flavor-inducing compounds were quantified in the circulating water and in fish flesh. Significantly higher concentrations of geosmin (GSM) (p<0.05) were observed in the controls compared to side-looped systems, but a similar effect was not observed in the case of 2-methylisoborneol (MIB). Among heavy metals, concentrations of Co (30 μg L−1), Ni (40 μg L−1), and Pb (140 μg L−1) decreased to below 10 μg L−1 in the side-loop water after the start-up of the system. Only low concentrations of Cu (5–30 μg L−1) were found in the rearing tank water, in both the side-loop and controls. The results indicated that this type of process design is suitable for safely producing fish of high quality.

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Changes in the Bacterial Community Structure of Denitrifying Sludge from a Recirculating Aquaculture System (RAS) After Geosmin and 2-Methylisoborneol Enrichment

Cited by 5 publications

References 47 publications

Impact of water quality parameters on geosmin levels and geosmin producers in European recirculating aquaculture systems

Impact of water quality parameters on geosmin levels and geosmin producers in European recirculating aquaculture systems

Removal of Emerging Contaminants by Degradation during Filtration: A Review of Experimental Procedures and Modeling

Efficient water treatment achieved in recirculating aquaculture system using woodchip denitrification and slow sand filtration

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