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Initial biomass concentration Maximum possible biomass concentration Specific growth rate constant at T = Topt Optimum temperature for growth Type of relation of growth with aw Yield of metabolic heat from growth Maintenance coefficient for metabolic heat Yield of biomass from dry substrate Maintenance coefficient for substrate Yield of metabolic water from growth Maintenance coefficient for water Fold-increase in transfer coefficients

0.001 kg-biomass kg-IDS-1e 0.23 kg-biomass kg-IDS-1e 0.236 h-1 38°C

Aspergillus-type (see Fig. 22.3(b)) 8.366 x 106 J kg-biomass-1 0 J s-1 kg-biomass-1 0.5 kg-biomass kg-dry-substrate-1 0 kg-dry-substrate s-1 kg-biomass-1 0.3 kg-water kg-biomass-1

0 kg-water s-1 kg-biomass-1 10 or 1

a The program converts all input variables and parameters to a consistent set of units. Note that where "biomass" is mentioned within the units, this represents dry biomass. bUsed to calculate the inlet air flow rate (F, kg-dry-air min-1).

c Used, in conjunction with Tin, to calculate the inlet air humidity, Hin (kg-water kg-dry-

air-1). This calculated value of Hin is used as the zero time value, Hino. dUsed in Eq. (19.9) to calculate the initial water content of the bed (Wo, kg-H2O kg-dry-solids-1).

eUsed to calculateXo andXm (kg). IDS = initial dry solids.

Table 23.2. Values used for the base case simulation of those parameters and variables that cannot be changed in the accompanying model of a well-mixed rotating-drum bioreactor

Symbol Significance

Base case value and unitsa

Parameters related to the effect of temperature on growth

A i Constant in the equation describing /u=f(T)

A2 Constant in the equation describing /u=f(T)

A3 Constant in the equation describing /u=f(T)

A4 Constant in the equation describing /u=f(T)

Other parameters and constants

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