Approach to modeling protozoa grazing on the basis of the current state of knowledge

Janiak, Kamil; Zięba, Bartosz; Szetela, R.; Muszyński-Huhajło, Mateusz; Miodoński, Stanisław; Jurga, Anna; Trusz-Zdybek, Agnieszka

doi:10.1016/j.ecolmodel.2021.109503

Cited by 2 publications

(1 citation statement)

References 39 publications

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“…It is well known that the quality of wastewater treatment depends on the presence of protozoa (ciliates, flagellates, amoebae) in activated sludge 26 . Ciliates are widely known for feeding on free floating bacteria, initiating floc formation and grazing effect 27 . The higher number of protozoa, the lower percentage of floc groups less than 10 μm in activated sludge 28 .…”

Section: Introductionmentioning

confidence: 99%

Seasonal prevalence of bacteria in the outflow of two full-scale municipal wastewater treatment plants

Domańska

Kuśnierz

Mackiewicz

2023

Sci Rep

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Despite many modern wastewater treatment solutions, the most common is still the use of activated sludge (AS). Studies indicate that the microbial composition of AS is most often influenced by the raw sewage composition (especially influent ammonia), biological oxygen demand, the level of dissolved oxygen, technological solutions, as well as the temperature of wastewater related to seasonality. The available literature mainly refers to the relationship between AS parameters or the technology used and the composition of microorganisms in AS. However, there is a lack of data on the groups of microorganisms leaching into water bodies whose presence is a signal for possible changes in treatment technology. Moreover, sludge flocs in the outflow contain less extracellular substance (EPS) which interferes microbial identification. The novelty of this article concerns the identification and quantification of microorganisms in the AS and in the outflow by fluorescence in situ hybridization (FISH) method from two full-scale wastewater treatment plants (WWTPs) in terms of 4 key groups of microorganisms involved in the wastewater treatment process in the context of their potential technological usefulness. The results of the study showed that Nitrospirae, Chloroflexi and Ca. Accumulibacter phosphatis in treated wastewater reflect the trend in abundance of these bacteria in activated sludge. Increased abundance of betaproteobacterial ammonia-oxidizing bacteria and Nitrospirae in the outflow were observed in winter. Principal component analysis (PCA) showed that loadings obtained from abundance of bacteria in the outflow made larger contributions to the variance in the PC1 factorial axis, than loadings obtained from abundance of bacteria from activated sludge. PCA confirmed the reasonableness of conducting studies not only in the activated sludge, but also in the outflow to find correlations between technological problems and qualitative and quantitative changes in the outflow microorganisms.

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Section: Introductionmentioning

confidence: 99%

Seasonal prevalence of bacteria in the outflow of two full-scale municipal wastewater treatment plants

Domańska

Kuśnierz

Mackiewicz

2023

Sci Rep

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Microbial Granule Technology—Prospects for Wastewater Treatment and Energy Production

2022

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Recent years have brought significant evolution and changes in wastewater treatment systems. New solutions are sought to improve treatment efficiency, reduce investment/operational costs, and comply with the principles of circular economy and zero waste. Microbial granules can serve as an alternative to conventional technologies. Indeed, there has been fast-growing interest in methods harnessing aerobic (AGS) and anaerobic (AnGS) granular sludge as well as microbial-bacterial granules (MBGS), as evidenced by the number of studies on the subject and commercial installations developed. The present paper identifies the strengths and weaknesses of wastewater treatment systems based on granular sludge (GS) and their potential for energy production, with a particular focus on establishing the R&D activities required for further advance of these technologies. In particular, the impact of granules on bioenergy conversion, including bio-oil recovery efficiency and biomethane/biohydrogen yields, and bioelectrochemical systems must be assessed and optimized.

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Approach to modeling protozoa grazing on the basis of the current state of knowledge

Cited by 2 publications

References 39 publications

Seasonal prevalence of bacteria in the outflow of two full-scale municipal wastewater treatment plants

Seasonal prevalence of bacteria in the outflow of two full-scale municipal wastewater treatment plants

Microbial Granule Technology—Prospects for Wastewater Treatment and Energy Production

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