Efficient water treatment achieved in recirculating aquaculture system using woodchip denitrification and slow sand filtration.

ABSTRACT: For a recirculating aquaculture system (RAS), a passive water treatment system was designed for efficient discharge nutrient removal and water reuse in RAS production. Denitrification in a woodchip bioreactor filled with birch wood (Betula pendula) followed by sand filtration was introduced into a side-loop of an experimental RAS rearing rainbow trout (Oncorhynchus mykiss). Denitrification efficiency remained high (96%) throughout the experiment and reached a nitrogen removal rate of 15 g NO₃-N m^-3 per day. Sand filtration was used to remove dissolved and particulate matter and improve water quality before being returned to water circulation. To ensure the absence of harmful substances in the system, heavy metals were quantified. Additionally, off-flavor-inducing comp

SUBMITTER: Lindholm-Lehto PC 

PROVIDER: S-EPMC8636402 | biostudies-literature | 2021 Dec

REPOSITORIES: biostudies-literature