Developing nutrient-rich fertilizer from toxic ammonia
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Researchers have recently found out how to use algae to convert ammonia and nitrates into a nutrient-rich fertilizer or fish feed ingredients.
A recirculating aquaculture system (RAS) is a shore-based fish farm that reuses its water by cleansing it using successive mechanical and biological processes before returning it to the fish tanks.
"The principle behind water reuse in an RAS facility is that it enables us to extract only very small volumes of new water to maintain operations," explains Norwegian researcher Charlotte Volpe.
Volpe is part of a research team participating in an innovation project called Wasteless in collaboration with facility designers Nofitech and salmon smolt producers Hardingsmolt. The project has been looking into how RAS facility operations can be made even more circular.
