Lecane tenuiseta (Rotifera, Monogononta) as the best biological tool candidate selected for preventing activated sludge bulking in a cold season

Fiałkowska, Edyta; Pajdak‐Stós, Agnieszka; Fyda, Janusz; Kocerba‐Soroka, Wioleta; Sobczyk, Mateusz

doi:10.1080/19443994.2016.1192565

Cited by 8 publications

(7 citation statements)

References 21 publications

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“…The morphology of L. tenuiseta is very similar to that of L. inermis , which is a known consumer of most of the filaments in activated sludge, but L. tenuiseta is more adapted to lower temperatures (Fiałkowska et al 2016). To date, the maximal growth rate reported for L. tenuiseta at 8 °C ( r = 0.16 individuals per day) is much higher than that for L. inermis ( r = 0.03 day −1 ), but L. inermis reaches a higher growth rate at 20 °C.…”

Section: Discussionmentioning

confidence: 99%

“…The first experiment showed that L. tenuiseta can effectively reduce the abundance of filamentous bacteria, such as M. parvicella and Type 0092, and these results are very promising from the perspective of using this species to prevent activated sludge bulking and as an alternative to L. inermis . The morphology of L. tenuiseta is very similar to that of L. inermis , which is a known consumer of most of the filaments in activated sludge, but L. tenuiseta is more adapted to lower temperatures (Fiałkowska et al 2016 ). To date, the maximal growth rate reported for L. tenuiseta at 8 °C ( r = 0.16 individuals per day) is much higher than that for L. inermis ( r = 0.03 day −1 ), but L. inermis reaches a higher growth rate at 20 °C.…”

Section: Discussionmentioning

confidence: 99%

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Foam-forming bacteria in activated sludge effectively reduced by rotifers in laboratory- and real-scale wastewater treatment plant experiments

Pajdak‐Stós

Kocerba‐Soroka

Fyda

et al. 2017

Environ Sci Pollut Res

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Lecane inermis rotifers were shown to diminish sludge bulking due to their ability to ingest the filamentous bacteria in activated sludge. To determine if rotifers are also able to control branched actinomycetes, we investigated three other Lecane species (Monogononta). In a week-long experiment, only Lecane tenuiseta significantly reduced the density of Microthrix parvicella and Type 0092 filaments, but in a 2-week experiment, actinomycetes were significantly reduced by most of the tested monogonont rotifers: L. inermis, Lecane decipiens and Lecane pyriformis. Rotifers L. inermis originating from the mass culture were artificially introduced into real-scale wastewater treatment plant (WWTP) in two series. The WWTP was monitored for 1 year. Rotifer inoculation resulted in diminishing of M. parvicella and actinomycete abundance. The experiments showed that different species of rotifers vary in their effectiveness at limiting various types of filamentous organisms. This is the first report demonstrating that one of the most troublesome bacteria, branched actinomycetes, which cause heavy foaming in bioreactors, can be controlled by rotifers. Knowledge of the consumers of filamentous bacteria that inhabit activated sludge could help WWTP operators overcome bulking and foaming through environmentally friendly methods.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Foam-forming bacteria in activated sludge effectively reduced by rotifers in laboratory- and real-scale wastewater treatment plant experiments

Pajdak‐Stós

Kocerba‐Soroka

Fyda

et al. 2017

Environ Sci Pollut Res

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“…This result shows that the fungus can grow at temperatures as low as 8 °C. Because some rotifers can live and even proliferate at such a low temperature [ 25 ], the fungus can be expected to survive in adverse conditions during the winter season.…”

Section: Discussionmentioning

confidence: 99%

“…Nevertheless, certain clones of L. inermis have a positive growth rate, even at such a low temperature [ 24 ]. Other experiments aiming to select rotifers that have better adapted to low temperatures and are capable of limiting the growth of filamentous bacteria have led to the selection of L. tenuiseta clones, which can proliferate at temperatures as low as 8 °C [ 25 ]. The abovementioned experiments were performed at a temperature range similar to that in WWTPs operating in temperate climate zones.…”

Section: Introductionmentioning

confidence: 99%

Temperature-Dependence of Predator-Prey Dynamics in Interactions Between the Predatory Fungus Lecophagus sp. and Its Prey L. inermis Rotifers

Fiałkowska

Pajdak‐Stós

2017

Microb Ecol

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Temperature is considered an important factor that influences the bottom-up and top-down control in water habitats. We examined the influence of temperature on specific predatory-prey dynamics in the following two-level trophic system: the predatory fungus Lecophagus sp. and its prey Lecane inermis rotifers, both of which originated from activated sludge obtained from a wastewater treatment plant (WWTP). The experiments investigating the ability of conidia to trap rotifers and the growth of fungal mycelium were performed in a temperature range that is similar to that in WWTPs in temperate climate. At 20 °C, 80% of the conidia trapped the prey during the first 24 h, whereas at 8 °C, no conidium was successful. The mycelium growth rate was the highest at 20 °C (r = 1.44) during the first 48 h but decreased during the following 24 h (r = 0.98), suggesting the quickest use of resources. At a medium temperature of 15 °C, the tendency was opposite, and the r value was lower during the first 48 h. At 8 °C, the growth rate was very low and remained at the same level even though numerous active rotifers were potentially available for the fungus. The temperature also influences the production of new conidia; on the 7th day, new conidia were observed in 96% of the wells at 20 °C, but no new conidia were observed at 8°C. These results show that the prey (rotifers)-predator (Lecophagus) dynamics in WWTPs is temperature-dependent, and a temperature of 8 °C is a strongly limiting factor for the fungus. Moderate temperatures ensure the most stable coexistence of the fungus and its prey, whereas the highest temperature can promote the prevalence of the predator.Electronic supplementary materialThe online version of this article (10.1007/s00248-017-1060-5) contains supplementary material, which is available to authorized users.

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“…Currently, a search is ongoing for unconventional methods by which the sedimentation of activated sludge might be improved and bulking of sludge reduced [16,17].…”

Section: Introductionmentioning

confidence: 99%

The possibility of using Portland cement to improve the sedimentation properties of activated sludge

Masłoń¹,

Opaliński²

2019

Desalination and Water Treatment

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Sludge bulking and foam on the surface of activated sludge tanks, as mainly resulting from the overgrowth of filamentous bacteria, is a problem encountered frequently in WWTPs. Activated sludge sedimentation can be improved through the use of chemical reagents and powdered materials. In that context, the work detailed here, demonstrated the impact of two types of Portland cement on such sedimentation properties, i.e. Portland cement (PC) and Portland-fly ash cement (PFAC). Settling tests showed differing efficiencies where the settlement capacity of activated sludge was concerned, in relation to both the type and amount of cement used. At 1.0 mL/L of cement milk, the decrease in settleability is almost unnoticeable. During tests with the highest dose of cement (10.0 mL/L), the reduction in activated sludge settleability was 16.8% for Portland-fly ash cement. Portland cement may thus represent an effective new reagent in activated sludge technology.

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Lecane tenuiseta (Rotifera, Monogononta) as the best biological tool candidate selected for preventing activated sludge bulking in a cold season

Cited by 8 publications

References 21 publications

Foam-forming bacteria in activated sludge effectively reduced by rotifers in laboratory- and real-scale wastewater treatment plant experiments

Foam-forming bacteria in activated sludge effectively reduced by rotifers in laboratory- and real-scale wastewater treatment plant experiments

Temperature-Dependence of Predator-Prey Dynamics in Interactions Between the Predatory Fungus Lecophagus sp. and Its Prey L. inermis Rotifers

The possibility of using Portland cement to improve the sedimentation properties of activated sludge

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