Conversion of radiant light energy in photobioreactors

Journal Article · Wed Jun 01 00:00:00 EDT 1994 · AIChE Journal (American Institute of Chemical Engineers); (United States)

DOI:https://doi.org/10.1002/aic.690400616· OSTI ID:7258071

Cornet, J F; Dussap, C G; Gros, J B ^[1]

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1. Univ. Blase Pascal, Aubiere (France). Lab. de Genie Chimique Biologique

The conversion of radiant light energy into chemical affinity by microorganisms in photobioreactors is examined. The kinetics of entropy production in the system is theoretically established from entropy and energy balances for the material and photonic phases in the reactor. A negative chemical affinity term compensated for by a radiant energy term at a higher level of energy characterizes photosynthetic organisms. The local volumetric rate of radiant light energy absorbed, which appears in the dissipation function as an irreversible term, is calculated for monodimensional approximations providing analytical solutions and for general tridimensional equations requiring the solution of a new numerical algorithm. Solutions for the blue-green alga Spirulina platensis cultivated in photoreactors with different geometries and light energy inputs are compared. Thermodynamic efficiency of the photosynthesis is calculated. The highest value of 15% found for low radiant energy absorption rates corresponds to a maximum quantum yield in the reactor.

• OSTI ID: 7258071
• Journal Information: AIChE Journal (American Institute of Chemical Engineers); (United States), Vol. 40:6; ISSN 0001-1541
• Country of Publication: United States
• Language: English

Related Subjects

14 SOLAR ENERGY
CYANOBACTERIA
BIOCHEMICAL REACTION KINETICS
PHOTOSYNTHESIS
BIOREACTORS
ENERGY EFFICIENCY
SOLAR ENERGY CONVERSION
THERMODYNAMICS
CHEMICAL REACTIONS
CONVERSION
EFFICIENCY
ENERGY CONVERSION
KINETICS
MICROORGANISMS
PHOTOCHEMICAL REACTIONS
REACTION KINETICS
SYNTHESIS
140505* - Solar Energy Conversion- Photochemical
Photobiological
& Thermochemical Conversion- (1980-)