Heat transfer in packed-beds of agricultural waste with low rates of air flow applicable to solid-state fermentation

Casciatori, Fernanda Perpétua; Thoméo, João Cláudio

doi:10.1016/j.ces.2018.05.024

Cited by 24 publications

(18 citation statements)

References 43 publications

(47 reference statements)

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“…Temporal temperature profiles in a bed of a SCB/WB mixture, with water sprinkling at 65 o C and 2.5 L min -1 and drum rotation at 1 rpm (T in = 45 ºC; RH = 91,53%; Q = 5 L min -1 ; T b,0 = 25 ºC; U b,0 = 50%; T w = 45 ºC). effective thermal properties of agricultural wastes are very low (Casciatori et al, 2013;Casciatori and Thoméo, 2018). The only operational alternatives in packed beds are the increase of the air flow rate and the reduction of the bed wall temperature, alternatives that would cause serious concerns to the cultivation process.…”

Section: Heat Transfer Resultsmentioning

confidence: 99%

Water Holding Capacity and Heat Transfer Aspects of a Mixture of Sugar Cane Bagasse and Wheat Bran in a Partially Filled Rotating Drum

Tada

Agudelo

Thoméo

2019

Braz. J. Chem. Eng.

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Maximum water holding capacity of a mixture of sugarcane bagasse and wheat bran was determined in static conditions and in a drum rotated at 1 rpm. The variables filling degree, water flow rate, volume of added water and number of sprinklers were tested to control the moisture content of the solid and the number of rotations to achieve homogeneous moisture content. None of the selected variables was significant, giving the apparatus high flexibility to control moisture content. For the heat transfer experiments, the tested variables were introduction of air through an inner tube amidst the particles, water sprinkling over the bed and drum rotation. The selected variables represented limited mechanisms of heat removal, although efficient when coupled with the drum rotation. The results are of value to control the temperature and the moisture content in solid-state cultivation bioreactors.

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Section: Heat Transfer Resultsmentioning

confidence: 99%

Water Holding Capacity and Heat Transfer Aspects of a Mixture of Sugar Cane Bagasse and Wheat Bran in a Partially Filled Rotating Drum

Tada

Agudelo

Thoméo

2019

Braz. J. Chem. Eng.

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“…The multipoint online temperature measurement of solid‐state bioreactors has garnered research interest for a long time . However, because previous reports had not constructed matrices of temperature sensors, an accurate and dense 4D inner bed profile including radius, height, temperature and cultivation time was not provided by real measurement.…”

Section: Resultsmentioning

confidence: 99%

“…5(a) The multipoint online temperature measurement of solid-state bioreactors has garnered research interest for a long time. [22][23][24][25]27 However, because previous reports had not constructed matrices of temperature sensors, an accurate and dense 4D inner bed profile including radius, height, temperature and cultivation time was not provided by real measurement. In the present work, benefitting from the capacity of 16P-TMS, each batch had more than 170 000 data, enough to provide the 4D profile describing the temperature evolution process at all the temperature measuring points during the whole cultivation batch.…”

Section: The Temperature Gradients Of the Vrsbr In The 22-cm-thick Cumentioning

confidence: 99%

Development and temperature gradient online monitoring of a vehicular rotary solid‐state bioreactor: a novel device for large‐scale preparation of Aspergillus niger spore inoculum

Zhang

Jiang

2019

J of Chemical Tech & Biotech

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BACKGROUND Mechanical cultivation of Aspergillus niger spores at industrial scales as the fermentationinoculum in citric acid plants is difficult to achieve: in solid‐state cultivation, intense mechanical agitation or continuous mixing to reduce damage to the filamentous microbes is not feasible, but inadequate mixing or static cultivation would cause serious inner‐bed temperature gradients. It is therefore necessary to develop novel bioreactors coordinating the conflict between microbe protection and heat transfer, by globally investigating the inner‐bed temperature profile, an investigation that has not been reported upon previously. RESULTS A novel vehicular rotary solid‐state bioreactor was developed combining the characteristics of both a vertical packed bed and a horizontal rotating drum. Moderate and intermittent rotary mixing based on the characteristic posture‐shifting function ensured high spore yields of 3.1 × 1012 per batch (22‐cm‐thick bed, using a rich medium) and 1.3 × 1012 per batch (15‐cm‐thick bed, using a poor medium and two‐stage temperature control strategy). The two‐stage temperature control strategy effectively depressed the upper limit of bed temperature under 37.0 °C. A 16‐point temperature measuring system provided online 4D data of the culture bed including time, temperature, radius and height, globally displaying the inner‐bed temperature gradients. A cylindrical air distributor benefits inner bed radial air flow distribution, but did not affect the spore yield and average moisture content of the solid culture. CONCLUSIONS The novel devices and methods realized large‐scale production of A. niger spores by coordinating moderate mixing and inner bed temperature field monitoring and control; they also possessed application value for other filamentous microbes. © 2019 Society of Chemical Industry

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“…An airflow through the system [46] was often applied to dissipate metabolic heat from the solid medium and also to supply the oxygen requirements for cultures. But there was a risk of drying out the substrate [47], and ventilation removed a fraction of moisture and fermentation heat during culture while providing oxygen content.…”

Section: Influence Of Medium Water Content In Enzymatic Production Anmentioning

confidence: 99%

Application and Analysis of Rhizopus oryzae Mycelia Extending Characteristic in Solid-state Fermentation for Producing Glucoamylase

Tang¹,

Luo²,

Xue³

et al. 2018

Journal of Microbiology and Biotechnology

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Enhanced application of solid-state fermentation (SSF) in industrial production and the influence of SSF of Rhizopus K1 on glucoamylase productivity were analyzed using the flat band method. A growth model was implemented through SSF of Rhizopus K1 in this experiment, and spectrophotometric method was used to determine glucoamylase activity. Results showed that in bran and potato culture medium with 70% moisture in a loose state, µ of mycelium reached to 0.15 h − 1 after 45 h of culture in a thermostatic water bath incubator at 30°C. Under a low-magnification microscope, mycelial cells appeared uniform, bulky with numerous branches, and were not easily ruptured. The generated glucoamylase activity reached to 55 U/g (dry basis). This study has good utilization value for glucoamylase production by Rhizopus in SSF.

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Heat transfer in packed-beds of agricultural waste with low rates of air flow applicable to solid-state fermentation

Cited by 24 publications

References 43 publications

Water Holding Capacity and Heat Transfer Aspects of a Mixture of Sugar Cane Bagasse and Wheat Bran in a Partially Filled Rotating Drum

Water Holding Capacity and Heat Transfer Aspects of a Mixture of Sugar Cane Bagasse and Wheat Bran in a Partially Filled Rotating Drum

Development and temperature gradient online monitoring of a vehicular rotary solid‐state bioreactor: a novel device for large‐scale preparation of Aspergillus niger spore inoculum

Application and Analysis of Rhizopus oryzae Mycelia Extending Characteristic in Solid-state Fermentation for Producing Glucoamylase

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