Microbial parameters (can be varied in the input file for the model)

Initial biomass contentg Maximum possible biomass content8 Specific growth rate constant at T = Topt Optimum temperature for growth Yield of biomass from dry substrate


Topt YXS

Type Type of relation of growth with aws Other parameters s Effective bed porosity during mixingh pS Density of dry solid particlesh

Gas/wall heat transfer coefficient

0.001 kg-biomass kg-IDS-1e 0.25 kg- biomass kg-IDS-1e 0.236 h-1 38°C

0.5 kg-biomass kg-dry-substrate-1 Aspergillus-type (see Fig. 22.3(b))

Solids/wall heat transfer coefficient

Wall/surroundings heat transfer coefficient 30 W m-2 °C-1

aThe program converts all input variables and parameters to a consistent set of units. Note that where "biomass" appears within the units, this represents dry biomass. b The addition of water is triggered when the outlet gas relative humidity falls below this set point.

cUsed as initial temperature of the solids (Tso), the gas phase (Tgo), and the bioreactor wall

Used, in conjunction with Tgo, to calculate the initial gas phase air humidity, H (kg-H2O kg-dry-air"1).

eUsed, in conjunction with Tin, to calculate the inlet air humidity, Hin (kg-H2O kg-dry-air-1) fUsed, in conjunction with Tso, to calculate the zero time water content of the solid phase

(Wo, kg-H2O kg-dry-solids-1). gUsed to calculateXo andXm (kg). Note that IDS = initial dry solids. hThe initial mass of dry substrate So is calculated as (1-s)pSVbed This value is used withXo to determine the initial mass of dry solids in the solids phase (Mo).

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