Open Ponds vs. Closed Systems
Closed, tubular glass PBRs, with long lifetimes and easy cleanability, are very well suited for the highly reproducible cultivation of algae resulting in highest possible growth rates and qualities. As such, tubular glass PBRs are also best suited for providing high quality inoculum for open pond systems.
Closed systems have a very low risk of contamination compared to open ponds, where other microorganisms or insects can have easy access. Birds and sand storms are additional hazards.
No limitation regarding the algae species that can be grown, due to effective blocking against competing organisms
Significantly higher productivity in terms of mass per volume and day
Very efficient use of land
Algae contrentration at harvest
Significantly higher concentration in terms of mass per liter
More efficient harvesting procedure
No evaporation within closed system compared in open ponds, which can lose significant water amounts, resulting in salt precipitation hazard
Water loss is limited to external factors, such as cooling processes, use of green houses, tube diameter, target temperature etc.
Biomass quality is highly reproducible due to excellent process control of tubular PBR systems
High value products or high quality inoculum can be produced with optimum reliability
Easy cleanability allows defined initial status any time, thus switching algae species is possible and secure
Use of GMO* for improved production process
GMO* is possible in closed reactor design whereas open ponds are very limited
*GMO=Genetically Modified Organism