Optimization of a raceway pond system for wastewater treatment: a review
Résumé
Microalgae are photosynthetic microorganisms with potential for biofuel production, CO2 mitigation
and wastewater treatment; indeed they have the capacity to assimilate pollutants in wastewaters.
Light supply and distribution among the microalgae culture is one of the major
challenges of photo-bioreactor design, with many studies focusing on microalgae culture systems
such as raceway ponds (RWP), widely used and cost-effective systems for algal biomass production.
This review focuses on possible improvements of the RWP design in order to achieve optimal
microalgal growth conditions and high biomass productivities, to minimize energy
consumption and to lower the capital costs of the pond. The improvement strategy is based on
three aspects: (1) hydrodynamic characteristics of the raceway pond, (2) evaluation of hydrodynamic
and mass transfer capacities of the pond and (3) design of the RWP. Finally, a possible
optimal design for the RWP is discussed in the context of wastewater treatment.
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