Non‐famous Scum Bacteria: Biological Characterization and Troubleshooting

Lemmer, Hilde; Lind, George; Müller, Elisabeth; Schade, Margit

doi:10.1002/aheh.200400567

Cited by 13 publications

(5 citation statements)

References 16 publications

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“…The Eikelboom Type 0092 ("not famous" bacteria) as one of the dominant species is in agreement with other studies [9,29,33,34]. In particular, the proliferation of this filamentous bacterium was favored by the operating conditions imposed in the IA-MBR and by the lack of dissolved oxygen during the anoxic phases, especially in the Period III.…”

Section: Filamentous Bacteria In Ia-mbrsupporting

confidence: 90%

The role of EPS in the foaming and fouling for a MBR operated in intermittent aeration conditions

Campo

Capodici

Bella

et al. 2017

Biochemical Engineering Journal

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a b s t r a c tThis work investigates the causes of foaming and fouling in an Intermittent Aerated -Membrane BioReactor (IA-MBR) used for wastewater treatment. The experiment was divided into three periods with different aerated regimes expressed with different t aeration /t cycle ratio (Period I: 60 min/180 min, Period II: 80 min/180 min, Period III: 30 min/90 min).The advanced foaming tests used allow the study of the role of extracellular polymeric substances (EPSs) on foaming and fouling. In general, in the Periods I and II, good correlations between the EPSs and the Modified Scum Index without purification (MSI 0 ) and the Foam Power were observed. The results shown that the filamentous microorganisms, which mainly grew in the Period III, play also a key factor in the foaming and fouling. In particular, when a net proliferation of filamentous bacteria occurred (during period III with a higher number of cycles per day) both EPSs concentration and filamentous abundance influence the modified scum index obtained after two purification steps (MSI 2 ). Finally, the processing data show that the EPSs hampered also the membrane filtration but improve the pre-filtration action of cake layer. On the other hand, the co-presence of EPSs and filamentous bacteria reduced the effect o cake layer as pre-filter.

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Section: Filamentous Bacteria In Ia-mbrsupporting

confidence: 90%

The role of EPS in the foaming and fouling for a MBR operated in intermittent aeration conditions

Campo

Capodici

Bella

et al. 2017

Biochemical Engineering Journal

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“…The screening of the biocenoses (for details see [18]) from 40 different WWTPs (38 municipal and two industrial WWTPs) with scum formation revealed in 98 % of all cases "M. parvicella" to occur in activated sludge. However, only in 50 % of the examined plants "M. parvicella" was the dominant filament in both activated sludge and scum.…”

Section: Resultsmentioning

confidence: 99%

Population Structure and Chemical EPS Analyses of Activated Sludge and Scum

Müller

Lind²,

Lemmer³

et al. 2005

Acta hydrochim. hydrobiol.

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The objective of this study was to quantify scum bacteria by FISH- In actinomycetes/Acinetobacter-dominated WWTP1 both lipophilic substances in the EPS and hydrophobic cell surfaces stabilized the scum layer. In "M. parvicella"-dominated WWTP2 the hydrophobic cell surfaces of these organisms were responsible for the hydrophobic sludge properties and sludge floating. In both of the selected WWTPs the detected lipophilic substances in the EPS improved growth rate and development of hydrophobic cell surfaces and therefore promoted scum processes. Populationsstruktur und chemische EPS-Analytik von Belebtschlamm und Schaum

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“…As shown in Table 2, the E. type 0092 and E. type 1851 are the morphotypes that dominated the biocenosis of biological foam in the examined cases even though they are considered "non-famous" scum bacteria (Lemmer et al, 2005). On the other hand, the quantities of other well-known, foam-forming bacteria, e.g., M. parvicella, Nocardioform, and Nostocoida limicola III were negligible.…”

Section: Role Of Filamentous Bacteria In Foaming In An Mbrmentioning

confidence: 92%

Foaming in membrane bioreactors: Identification of the causes

Bella¹,

Torregrossa

2013

Journal of Environmental Management

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a b s t r a c tMembrane bioreactors (MBRs) represent by now a well established alternative for wastewater treatment. Their increasing development is undoubtedly related to the several advantages that such technology is able to guarantee. Nevertheless, this technology is not exempt from operational problems; among them the foaming still represents an "open challenge" of the MBR field, due to the high complexity of phenomenon. Unfortunately, very little work has been done on the foaming in MBRs and further studies are required. Actually, there is not a distinct difference between conventional activated system and MBR: the main difference is that the MBR plants can retain most Extracellular Polymeric Substances (EPSs) in the bioreactor. For these reason, unlike conventional activated sludge systems, MBRs have experienced foaming in the absence of foam-forming micro-organisms. Nevertheless, the actual mechanisms of EPS production and the role of bacteria in producing foam in activated sludge in MBRs are still unclear. In this paper, the authors investigated the roles of EPS and foam-forming filamentous bacteria by analyzing samples from different pilot plants using MBRs. In particular, in order to define the macroscopic features and the role of EPS and filamentous bacteria, a Modified Scum Index (MSI) test was applied and proposed. Based on the MSI and the foam power test, the causes of biological foaming were identified in terms of the potential for foaming, the quality and the quantity of the foam. The results indicated that the MBR foaming was influenced significantly by the concentration of bound EPSs in the sludge. In addition, the quantity and stability of MBR scum increased when both bound EPSs and foam-forming filamentous bacteria were present in the activated sludge.

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Non‐famous Scum Bacteria: Biological Characterization and Troubleshooting

Cited by 13 publications

References 16 publications

The role of EPS in the foaming and fouling for a MBR operated in intermittent aeration conditions

The role of EPS in the foaming and fouling for a MBR operated in intermittent aeration conditions

Population Structure and Chemical EPS Analyses of Activated Sludge and Scum

Foaming in membrane bioreactors: Identification of the causes

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