Inverted hollow spinning cone as a device for controlling foam and hold-up in pilot scale gassed agitated fermentation vessels

Stocks, Stuart M.; Cooke, Mike; Heggs, Peter J.

doi:10.1016/j.ces.2004.11.016

Cited by 8 publications

(3 citation statements)

References 13 publications

(46 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Bubbles created during the digestion process rise through the water column and emerge from the liquid surface into a foam matrix. The collapse of digester foam occurs under influences of gravity, surface tension, and capillary forces (Stocks, 2005). Under normal operating conditions, a dynamic foam condition exists such that the rates of foam formation and collapse are at equilibrium.…”

Section: Gas Holdupmentioning

confidence: 99%

Digester Gas Hold-up and Rapid Rise Foam Formation

Chapman¹,

Strehler²,

Truong³

et al. 2014

proc water environ fed

View full text Add to dashboard Cite

For decades, plant operators from certain wastewater treatment plants have been plagued with anaerobic digester foaming. Foaming within an anaerobic digester can present significant problems for a utility, including: off-site odors, foam/sludge spillage from overflows, loss of digester cover buoyancy on floating cover digesters, fouling of gas lines, and over pressurization of the digester through clogged pressure relief valves (PRVs)

show abstract

Section: Gas Holdupmentioning

confidence: 99%

Digester Gas Hold-up and Rapid Rise Foam Formation

Chapman¹,

Strehler²,

Truong³

et al. 2014

proc water environ fed

View full text Add to dashboard Cite

show abstract

“…Mechanical, acoustic and ultrasonic methods to manage foam within fermenters have also been variously employed, as summarised by Stocks et al (2005) and Winterburn and Martin (2008). The most common practice is the use of additional impellers on the agitator shaft to disrupt modest rates of foam generation with little additional equipment complexity.…”

Section: Foam Generation and Controlmentioning

confidence: 99%

Foam mitigation and exploitation in biosurfactant production

Winterburn

Martin

2011

Biotechnol Lett

View full text Add to dashboard Cite

Biosurfactants could potentially outperform traditional surfactants in many applications whilst being more sustainable to source, manufacture, use and dispose of. However, currently available fermentation production methods are too inefficient to manufacture biosurfactants for these high volume markets. Foaming in an inherent issue with biosurfactant production and adds significantly to the cost of production using traditional unit operations. This review illustrates how the application of process engineering has enabled nuisance foaming to be transformed into a cost saving feature of the production system. The scope of biosurfactants and their application is discussed and the fundamentals of foam generation and control are reviewed. The range of specific phenomena associated with the interaction of foams with bioproducts is assessed. Finally, recent work which has aimed at taking advantage of some of these phenomena in order to intensify the biosurfactant production process is discussed in detail.

show abstract

“…Numerous mechanical foam-control devices have been proposed [2,3]. Mechanical foam-control devices with rotating installations are the most common among these: impellers [13,14], conical dishes [2], centrifugal basket [10], and inverted hollow spinning cones [11,12]. Various kinds of impellers have been reported as foam-breaking impellers: a six-blade turbine [13,14], a six-blade vaned disk [14], a two-blade paddle [13,14], a two-blade paddle with three slits [13], and a two-blade paddle with 168 needles [13].…”

Section: Introductionmentioning

confidence: 99%

Improvement of foam breaking and oxygen-transfer performance in a stirred-tank fermenter

Takesono

Onodera

Toko

et al. 2005

Bioprocess Biosyst Eng

View full text Add to dashboard Cite

This study examined a stirred-tank fermenter (STF) containing low-viscosity foaming liquids with an agitation impeller and foam-breaking impeller mounted on the same shaft. Results showed that the performance of the foam-breaking impeller can be improved by changing a conventional six-blade turbine impeller into a rod impeller as the agitation impeller. The volumetric oxygen-transfer coefficient, kLa, in the mechanical foam-control method (MFM) using a six-blade vaned disk as the foam-breaking impeller in the STF with the rod impeller was approximately five times greater than that of the chemical foam-control method (CFM) adding an anti-foaming agent in the STF with the six-blade turbine impeller. Application of the present method to the cultivation of Saccharomyces cerevisiae K-7 demonstrated that the cultivation time up to the maximum cell concentration was remarkably shorter than that achieved using a conventional CFM.

show abstract

Inverted hollow spinning cone as a device for controlling foam and hold-up in pilot scale gassed agitated fermentation vessels

Cited by 8 publications

References 13 publications

Digester Gas Hold-up and Rapid Rise Foam Formation

Digester Gas Hold-up and Rapid Rise Foam Formation

Foam mitigation and exploitation in biosurfactant production

Improvement of foam breaking and oxygen-transfer performance in a stirred-tank fermenter

Contact Info

Product

Resources

About