Investigating the use of cooling surfaces in solid‐state fermentation tray bioreactors: modelling and experimentation

Khanahmadi, Morteza; Roostaazad, Reza; Safekordi, Ali Akbar; Bozorgmehri, Ramin; Mitchell, David A.

doi:10.1002/jctb.1117

Cited by 25 publications

(17 citation statements)

References 22 publications

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“…Therefore, in SSF, most studies on solid state bioreactor designs are focused on maximising heat removal [74,75]. The problem becomes crucial in large-scale systems where heat evolution leads to huge moisture losses and, under these circumstances, disturbing fungal growth [76,77]. Another problem is that heat creates condensation such that a large amount of water is returned back to the fermented solid.…”

Section: Temperaturementioning

confidence: 99%

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Design Aspects of Solid State Fermentation as Applied to Microbial Bioprocessing

Webb¹

2017

JABB

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Solid state fermentation (SSF) refers to the microbial fermentation, which takes place in the absence or near absence of free water, thus being close to the natural environment to which the selected micro organisms, especially fungi, are naturally adapted. SSF has been used in the world for a long time. This technology is commonly known in the East, for traditional manufacture of fermented foods, and in the west, for mould-ripened cheese. It can be defined as a system, in which the growth of selected microorganism(s) occurs on solid materials with low moisture contents and has been identified as a potentially important methodology and technique in biotechnology. Nowadays, SSF is an economically viable, practically acceptable technology for large-scale bioconversion and biodegradation processes. Development of sustainable SSF and bioprocess technology is an emerging, multidisciplinary field with possible application to the production of enzymes, chemicals, bioethanol and pharmaceuticals. SSF offers many advantages over conventional submerged fermentation (SMF) such as, simple and inexpensive substrates, elimination of the need for solubilisation of nutrient from within solid substrates, elimination of the need for rigorous control of many parameters during fermentation, product yields are mostly higher, lower energy requirements, produce less waste water, no foam generation and relatively easy recovery of end products. SSF provides flexibility in terms of the raw materials to be used and their capability to produce various value-added products. Keywords:

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Section: Temperaturementioning

confidence: 99%

“…Due to this, the rate of diffusion of oxygen, nutrients and enzymes may vary. Diffusivity processes limit the growth rate, especially within the solid substrate particles [76,77].…”

Section: Bioreactor Type Features/problemsmentioning

confidence: 99%

Design Aspects of Solid State Fermentation as Applied to Microbial Bioprocessing

Webb¹

2017

JABB

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“…The heat generated by biological activity is represented by the third term on the right-hand side of equation (1); such an approach for modelling biological activity has been used in a number of models for solid state fermentation processes [10].…”

Section: C39mentioning

confidence: 99%

A two dimensional, reaction-diffusion model of compost piles

Luangwilai

Sidhu

Nelson

2012

ANZIAMJ

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We consider the self heating process in a two dimensional spatially dependent model of a compost pile which incorporates terms that account for self heating due to both biological and oxidation mechanisms. As moisture is a crucial factor in both the degradation process and spontaneous ignition within a compost pile, this model consists of four mass-balance equations, namely, energy, oxygen, vapour and liquid water concentrations. Analyses are undertaken for different initial water contents within the compost pile. We show that when the water content is too low, the reaction is almost negligible; whereas when it is too high, the reaction commences only when the water content evaporates and the water ratio drops to within an appropriate range. However, for an intermediate water content range, the biological reaction is at its optimum and there is a possibility of spontaneous ignition within the compost pile.

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“…However, the rate of inter-particle transfer of solutes is assumed to be negligible. This assumption is consistent with the steep moisture and glucoamylase activity gradients that occur in an unmixed bed of fermenting wheat bran (Khanahmadi et al, 2004). More direct evidence was provided by a study of mixing patterns within rotating-drum bioreactor: there was no transfer of rhodamine from dyed wheat bran particles to non-dyed ones (Marsh et al, 2000).…”

Section: Basic Modelmentioning

confidence: 56%