The frequency of harvesting depends on the daily growth rate, which is dependent upon light and temperature conditions. For example, the production facility at Earthrise harvests close to 3 metric tons of Spirulina a day during the peak season. As described above, the culture is transferred with a pump through PVC pipes into a dedicated processing building, where it is passed over a series of stainless-steel screens to rinse and concentrate the biomass. The filtrate is transferred back to the pond while the paste from the final stage of the filtration process is pumped into a spray dryer to remove the moisture, resulting in the free-flowing fine powder.
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