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Transfer of oxygen and scale-up in submerged aerobic fermentation

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Part of the book series: Advances in Biochemical Engineering ((ABE,volume 4))

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Abbreviations

a:

gas/liquid interfacial area per unit liquid volume, m2/m3

am :

liquid/cell interfacial area per unit liquid volume, m2/m3

ap :

liquid/pellet interfacial area per unit liquid volume, m2/m3

B:

width of baffle, m

C:

concentration of dissolved oxygen or penetrating component, kg-moles/m3

(C L) cr :

critical oxygen concentration in liquid, kg-moles/m3

(C Li) cr :

critical oxygen concentration at liquid/cell or liquid/pellet interface, kg-moles/m3

CL :

concentration of dissolved oxygen in bulk of liquid, kg-moles/m3

(C L) i :

initial concentration of dissolved oxygen in bulk of liquid, kg-moles/m3

CLi :

concentration of dissolved oxygen at liquid/cell or liquid/pellet interface, kg-moles/m3

C*L :

oxygen concentration in equilibrium with air, kg-moles/m3

C 0 :

concentration of dissolved oxygen at center of cell or pellet kg-moles/m3

Cm :

dry cell weight per unit liquid volume, kg/m3

D:

agitator diameter, m

De :

effective diffusion coefficient of dissolved oxygen in mycelial pellet, m2/hr

DL :

molecular diffusion coefficient of dissolved oxygen or transfer material in liquid m2/hr

Dp :

molecular diffusion coefficient of dissolved oxygen in mycelial pellet, m2/hr

dBM :

average diameter of bubble, m

dp :

diameter of particle, m

g:

acceleration due to gravity, m/hr2

gc :

gravitational conversion factor, kg · m/Kg · hr2, where Kg indicates gravitational unit, while kg indicates mass unit

H:

depth of medium in tank, m

HG :

holdup of gas in tank

HL :

holdup of liquid in tank

h:

clearance from tank bottom to agitator, m

kc :

specific respiration coefficient defined by Eq. (15)

KL :

overall mass-transfer coefficient based on liquid film around gas bubbles, m/hr

kL :

mass-transfer coefficient for liquid film around gas bubbles, m/hr

Km :

apparent Michaelis constant for mycelia, kg-moles/m3

K m :

apparent Michaelis constant for pellet, kg-moles/m3

km :

mass-transfer coefficient for liquid film around cells or pellets defined by Eq. (2), m/hr

kp :

oxygen-transfer coefficient for pellet defined by Eq. (27), m/hr

kr :

specific oxygen-uptake rate per unit dry mycelial weight, kg-moles of oxygen/[(hr)(kg of dry cell)]

(k r)max :

maximum specific oxygen-uptake rate per unit dry mycelial weight, kg-moles of oxygen/[(hr)(kg of dry cell)]

l:

length of agitator blade, m

N:

agitation speed, R.P.H. or R.P.M.

NFr :

Froud number defined by DN 2/g

Np :

Power number defined by P 0 g cLN3 D 5

NPe :

Peclet number defined by d PU/DL

NRe :

Reynolds number defined by D 2LL

(N Re) p :

Reynolds number for pellet defined by d PDNρLL

Pg :

power consumption accompanied by aeration, Kg · m/hr

P 0 :

power consumption without aeration, Kg · m/hr

P max :

maximum power consumption without aeration, Kg · m/hr, where Kg indicates gravitational unit

q:

volumetric flow rate of gas, m3/hr

R:

radius of mycelial pellet, m

r:

radial distance from center of cell or mycelial pellet, m

rL :

radial distance from cell center to liquid bulk, m

r 0 :

radius of cell, m

T:

diameter of tank, m

t 1/2 :

half-life time of oxygen concentration in liquid, min

U:

relative velocity of particle and fluid, m/hr

Ut :

terminal velocity of particle in free fall, m/hr

V:

liquid volume in tank, m3

Vr :

rapid oxygen-uptake rate per unit mycelial pellet, given by Eq. (21), kg-moles of oxygen/[(hr)(one pellet)]

V r :

oxygen-uptake rate per unit mycelial pellet, kg-moles of oxygen/[(hr)(one pellet)]

Vs :

superficial gas velocity based on cross section of tank, m/hr

Vt :

terminal gas velocity in free rise, m/hr

W:

agitator blade width, m

x:

distance for penetration direction from interface, m

∈:

void fraction

η:

effectiveness factor for oxygen consumption rate per unit mycelial pellet

θ:

time, hr

μL :

liquid viscosity, kg/m · hr

ρ:

mycelial density in pellet, kg/m3

ρL :

liquid density, kg/m3

Δρ:

difference in density between dispersed and continuous phases, kg/m3

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© 1976 Springer-Verlag

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Miura, Y. (1976). Transfer of oxygen and scale-up in submerged aerobic fermentation. In: Advances in Biochemical Engineering, Volume 4. Advances in Biochemical Engineering, vol 4. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-07747-2_5

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  • DOI: https://doi.org/10.1007/3-540-07747-2_5

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  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-540-07747-3

  • Online ISBN: 978-3-540-38240-9

  • eBook Packages: Springer Book Archive

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