Low F/M bulking and scumming: Towards a better understanding by modelling

1995 ◽  
Vol 31 (2) ◽  
pp. 225-234 ◽  
Author(s):  
Jürg Kappeler ◽  
René Brodmann
Keyword(s):  
Nitric Oxide ◽  
Activated Sludge ◽  
Simulation Model ◽  
Mathematical Simulation

Low F/M bulking and scumming in activated sludge plants is a phenomenon which is not completely understood. Casey et al. hypothesised that low F/M bulking and scumming is caused by the denitrification intermediate nitric oxide. Based on this hypothesis, a mathematical simulation model is formulated which predicts the most important observations related to low F/M bulking and scumming: surfactants and hydrophobic substrates may lead to the proliferation of low F/M filaments, and low F/M bulking and scumming is normally not suppressed by aerobic or small anoxic selectors. Beside these well established facts, the model predicts that incomplete nitrification can cause serious low F/M bulking and scumming problems, that large anoxic selectors with complete denitrification prevent low F/M bulking and scumming and extended sludge blankets in the secondary clarifiers influence the proliferation of low F/M filaments: in completely aerobic systems in a negative way, in systems with predenitrification zones in a positive way.

Scumming Due to Actinomycetes: An Uncalibrated Simulation Model

1994 ◽  
Vol 29 (7) ◽  
pp. 285-288
Author(s):  
Jürg Kappeler ◽  
Willi Gujer
Keyword(s):  
Activated Sludge ◽  
Simulation Model ◽  
Mathematical Simulation ◽  
Hydrophobic Substrate

Applications of a mathematical simulation model, which is based on a condensed summary of hypotheses related to “Scumming due to Actinomycetes”, are presented. The most important observations from practice may be simulated with the model: Substantial concentrations of hydrophobic substrate and especially non biodegradable or only slowly biodegradable surfactants may provoke a dramatic increase in the Actinomycetes population of the activated sludge.

scholarly journals A Kinetic Simulation Model That Describes Catalysis and Regulation in Nitric-oxide Synthase

2000 ◽  
Vol 276 (2) ◽  
pp. 1233-1243 ◽  
Author(s):  
Jérôme Santolini ◽  
Subrata Adak ◽  
Christine M. L. Curran ◽  
Dennis J. Stuehr
Keyword(s):  
Nitric Oxide ◽  
Nitric Oxide Synthase ◽  
Simulation Model ◽  
Kinetic Simulation ◽  
Oxide Synthase

scholarly journals Development of a 3-D Sinter Process Mathematical Simulation Model

2005 ◽  
Vol 45 (4) ◽  
pp. 522-531 ◽  
Author(s):  
Hideyuki YAMAOKA ◽  
Takazo KAWAGUCHI
Keyword(s):  
Simulation Model ◽  
Mathematical Simulation ◽  
Sinter Process

scholarly journals Influence of temperature on the transmission performance of track circuit in high-speed railway

2019 ◽  
Vol 272 ◽  
pp. 01025
Author(s):  
Yixuan Yang ◽  
Zhichao Qiao ◽  
Huiyuan Yin ◽  
Jilong Li
Keyword(s):  
Simulation Model ◽  
Mathematical Simulation ◽  
High Speed ◽  
Transmission Performance ◽  
High Speed Railway ◽  
Influence Of Temperature ◽  
Influence Mechanism ◽  
Influence Of Temperature On ◽  
Track Circuit

In order to explore the influence of temperature on track circuit, a mathematical simulation model of track circuit is established. Then, the influence mechanism of temperature on the key equipment of track circuit is analysed. Finally, the influence on the receiver voltage and the locomotive signal current are computed based on the simulation model.

Development of Simulation Model for a Combined Activated-Sludge and Biofilm Process to Remove Nitrogen and Phosphorus

1999 ◽  
Vol 71 (4) ◽  
pp. 388-397 ◽  
Author(s):  
Yutaka Suzuki ◽  
Masahiro Takahashi ◽  
Markus Haesslein ◽  
Carl F. Seyfried
Keyword(s):  
Activated Sludge ◽  
Simulation Model ◽  
Nitrogen And Phosphorus ◽  
Biofilm Process

scholarly journals The thyroid cancer policy model: A mathematical simulation model of papillary thyroid carcinoma in The U.S. population

PLoS ONE ◽  
2017 ◽  
Vol 12 (5) ◽  
pp. e0177068 ◽  
Author(s):  
Carrie Lubitz ◽  
Ayman Ali ◽  
Tiannan Zhan ◽  
Curtis Heberle ◽  
Craig White ◽  
...  
Keyword(s):  
Thyroid Cancer ◽  
Papillary Thyroid Carcinoma ◽  
Thyroid Carcinoma ◽  
Simulation Model ◽  
Mathematical Simulation ◽  
Papillary Thyroid ◽  
Policy Model ◽  
The U.S

scholarly journals Draft genome sequence of a Candidatus Brocadia bacterium enriched from tropical-climate activated sludge

2017 ◽  
Author(s):  
Xianghui Liu ◽  
Krithika Arumugam ◽  
Gayathri Natarajan ◽  
Thomas W. Seviour ◽  
Daniela I. Drautz-Moses ◽  
...  
Keyword(s):  
Nitric Oxide ◽  
Activated Sludge ◽  
Genome Sequence ◽  
Nitrite Reductase ◽  
Draft Genome ◽  
Draft Genome Sequence ◽  
Anammox Bacterium ◽  
Ribosomal Rnas ◽  
Coding Regions ◽  
Gene Coding

AbstractWe present the draft genome of an anaerobic ammonium-oxidizing (anammox) bacterium, cluster III Candidatus Brocadia, which was enriched in an anammox reactor. A 3.2 Mb genome sequence comprising 168 contigs was assembled, in which 2,765 gene-coding regions, 47 tRNAs, and 5S, 16S and 23S ribosomal RNAs were annotated. No evidence for the presence of a nitric oxide-forming nitrite reductase was found.

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