Scum in Activated Sludge Plants: Impact of Non-filamentous and Filamentous Bacteria

Lemmer, Hilde; Lind, George; Müller, Elisabeth; Schade, Margit; Ziegelmayer, B.

doi:10.1002/(sici)1521-401x(200001)28:1<34::aid-aheh34>3.0.co;2-4

Cited by 20 publications

(1 citation statement)

References 31 publications

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“…Furthermore, the exact mechanism of how the foaming process is initiated, and further stabilized, still remains unknown. Hence, there is a clear need to further understand, predict, and assess foaming events in full-scale WWTPs (Kocianova et al 1992;Lemmer et al 2000;Hladikova et al 2002;Nakajima and Mishima 2005;Heard et al 2008).…”

Section: Introductionmentioning

confidence: 99%

Microbial-based evaluation of foaming events in full-scale wastewater treatment plants by microscopy survey and quantitative image analysis

Leal

Amaral

Costa

2016

Environ Sci Pollut Res

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Activated sludge systems are prone to be affected by foaming occurrences causing the sludge to rise in the reactor and affecting the wastewater treatment plant (WWTP) performance. Nonetheless, there is currently a knowledge gap hindering the development of foaming events prediction tools that may be fulfilled by the quantitative monitoring of AS systems biota and sludge characteristics. As such, the present study focuses on the assessment of foaming events in full-scale WWTPs, by quantitative protozoa, metazoa, filamentous bacteria, and sludge characteristics analysis, further used to enlighten the inner relationships between these parameters. In the current study, a conventional activated sludge system (CAS) and an oxidation ditch (OD) were surveyed throughout a period of 2 and 3 months, respectively, regarding their biota and sludge characteristics. The biota community was monitored by microscopic observation, and a new filamentous bacteria index was developed to quantify their occurrence. Sludge characteristics (aggregated and filamentous biomass contents and aggregate size) were determined by quantitative image analysis (QIA). The obtained data was then processed by principal components analysis (PCA), cross-correlation analysis, and decision trees to assess the foaming occurrences, and enlighten the inner relationships. It was found that such events were best assessed by the combined use of the relative abundance of testate amoeba and nocardioform filamentous index, presenting a 92.9 % success rate for overall foaming events, and 87.5 and 100 %, respectively, for persistent and mild events.

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Section: Introductionmentioning

confidence: 99%

Microbial-based evaluation of foaming events in full-scale wastewater treatment plants by microscopy survey and quantitative image analysis

Leal

Amaral

Costa

2016

Environ Sci Pollut Res

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Activated Sludge‐Foaming

Soddell

2003

Encyclopedia of Environmental Microbiology

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What is Foaming? Which Microbes Cause Foaming? Use of Molecular Probes in Foam Monitoring Foam Hydrophobicity and Foam Foam Control Foaming in Anaerobic Digesters

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Microbial Foaming and Bulking in Activated Sludge Plants

Stainsby¹,

Philp²,

Dunbar³

et al. 2004

Water Encyclopedia

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Microbial foaming and bulking are among the most frequent and widespread problems in activated sludge (AS) wastewater treatment plants (WWTPs). Bulking has plagued AS plants almost since their inception nearly a century ago, whereas microbial foaming was not documented until around 30 years ago. Both problems are associated with the excessive growth of various filamentous bacteria, although the mechanisms by which they form are not fully understood. Initial attempts to identify these bacteria shifted attention from engineering aspects to the microbiological activities fundamental to the activated sludge process. Subsequently, filament identification keys and abundance scales became routine tools for monitoring filamentous populations in activated sludge. More recently, molecular biological techniques have enabled more detailed and precise study of the diversity and ecology of bacterial communities associated with foaming and bulking.

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Scum in Activated Sludge Plants: Impact of Non-filamentous and Filamentous Bacteria

Cited by 20 publications

References 31 publications

Microbial-based evaluation of foaming events in full-scale wastewater treatment plants by microscopy survey and quantitative image analysis

Microbial-based evaluation of foaming events in full-scale wastewater treatment plants by microscopy survey and quantitative image analysis

Activated Sludge‐Foaming

Microbial Foaming and Bulking in Activated Sludge Plants

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