Foaming: Consequences, prevention and destruction

Vardar‐Sukan, Fazilet

doi:10.1016/s0734-9750(98)00010-x

Cited by 101 publications

(91 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…From other biotechnological fields, it is known that foam production in submerse cultures is dependent on the hydrodynamic conditions which are in turn affected by gas production, medium composition, the presence of growing cells, and the production of metabolites and surface-active compounds [17]. The produced foam and the stabilizing compounds can be released by both cell metabolism as extracellular products (e.g., exoenzymes) and by enzymatic decomposition after cell autolysis.…”

Section: What Is Foam?mentioning

confidence: 99%

“…Moreover, the cell surface itself can have hydrophobic properties -some microorganisms produce extracellular polymeric substances which enable the cells to hold onto each other or to stick to surfaces (e.g., biofilm formation). Through the effect of physical processes, such as stirring, the cell walls are exposed to shear stress, which leads to the release of substances with surface-active properties [12,17]. Substances supporting foam formation and stabilizing the foam also enter the biogas reactor during its feeding procedure.…”

Section: What Is Foam?mentioning

confidence: 99%

“…Due to the complexity of biosystems, it is difficult to relate their foaming characteristics to single medium components [17]. Nevertheless, some correlations between foaming and feeding of certain substrates and other incidences in biogas reactors can be observed.…”

Section: Causes Of Foam In Biogas Plantsmentioning

confidence: 99%

“…The most commonly used anti-foaming agent is plant oil. The advantages of plant oils as a defoamer are their biodegradability, good availability, and low price [17]. However, only those oils where mucilage, such as phosphoglycerides, has been removed should be used [3].…”

Section: Foam Suppressionmentioning

confidence: 99%

“…Before applying an anti-foaming agent, economic aspects, such as the amounts required and the efficiency of foam removal, should be evaluated. The choice of an appropriate concentration is very important as too low or too high concentrations can contribute to a stabilization of the existing foam [17]. Moreover, excessive amounts can have a negative impact on the biogas microbiology (L Moeller, unpublished results).…”

Section: Foam Suppressionmentioning

confidence: 99%

See 4 more Smart Citations

Comparative review of foam formation in biogas plants and ruminant bloat

et al. 2012

View full text Add to dashboard Cite

This review gives an overview of the current knowledge concerning the problem of foam formation in the process of anaerobic digestion in biogas plants that utilize renewable resources or biogenic waste material for biogas production. Process upsets in biogas production induced by foam formation can have a negative impact on the efficiency of biogas plants. The foam can block gas pipes and cause severe damage to the bioreactor equipment, ranging from a failure of the feeders to a damage of the roof of the biogas plant. The most common foam removal methods -stirring in the foam, adding anti-foaming agents, diminishing substrate feeding, and altering the biogas reactor management -are not always successful. However, the reasons for the excessive foam formation during the biogas production process have not yet been elucidated in detail. In contrast, foam building in the rumen of ruminants as a cause for bloat has been studied thoroughly. In general, the interaction between proteins, polysaccharides (mucilage), and small plant particles is assumed to be the crucial factor. As the fermentation process in the rumen has many similarities with the biogas production process, the current research results on bloat in ruminants are summarized and compared with the process of foaming in biogas plants.

show abstract

Section: What Is Foam?mentioning

confidence: 99%

Section: What Is Foam?mentioning

confidence: 99%

Section: Causes Of Foam In Biogas Plantsmentioning

confidence: 99%

Section: Foam Suppressionmentioning

confidence: 99%

Section: Foam Suppressionmentioning

confidence: 99%

See 3 more Smart Citations

Comparative review of foam formation in biogas plants and ruminant bloat

et al. 2012

View full text Add to dashboard Cite

show abstract

Fermentation

Junker

2004

Kirk-Othmer Encyclopedia of Chemical Technology

View full text Add to dashboard Cite

Fermentation processes, products, and economic aspects are summarized according to the product classes of primary metabolites, secondary metabolites, biomass, enzymes (and whole cell biocatalysts), and biologicals. Although the information is focused on aerobic stirred tank processes, anaerobic, bubble column, and/or immobilized production techniques are referenced where applicable. Advantages of biochemical production over strictly synthetic processes are discussed. The history of fermentation is described at time periods of pre‐1700s, 1700s–1900, 1900–1945, 1945–1960, 1960–1970, 1970–1995, and 1995 to the present. This progression is followed by an overview of microbiological and fermentation principles, equipment requirements, inoculum development and scale‐up techniques, utilities, and regulatory considerations. Throughout this article specific product and process examples are included.

show abstract

Fermentation and Bioprocess Development

Zeng

2021

Kirk-Othmer Encyclopedia of Chemical Technology

View full text Add to dashboard Cite

Fermentation is the process of microbial and biochemical conversion of organic substances and other raw materials (eg, CO and CO 2 ), with broad applications in food, pharmaceutical, and chemical industries and for environmental and climate protection. It can be considered as the vehicle to transfer innovations in fundamental biology into bio‐based products and thus plays a key role in bioeconomy. This article first gives an overview of the fermentation industry and its important products in industrial and pharmaceutical biotechnologies, ranging from primary and secondary metabolites to cells (biomass), enzymes, and biologics. Microbial principles and characteristics of fermentation processes are then illustrated and compared with chemical synthesis. The driving forces, scientific discoveries, and technological innovations leading to the development of different fermentation processes and products are reviewed from a historical perspective, and future trends are highlighted. The development of components and techniques of fermentations with different cell types and key issues of their industrial applications are finally described from practical viewpoints with process examples, including strains and host cells, medium design and feeding strategies, fermenter and related equipment, sterilization, process control, product isolation, scale‐up, utilities, and regulatory aspects.

show abstract

Foaming: Consequences, prevention and destruction

Cited by 101 publications

References 41 publications

Comparative review of foam formation in biogas plants and ruminant bloat

Comparative review of foam formation in biogas plants and ruminant bloat

Fermentation

Fermentation and Bioprocess Development

Contact Info

Product

Resources

About