Water quality in recirculating aquaculture system using woodchip denitrification and slow sand filtration.

ABSTRACT: In recirculating aquaculture system (RAS), ammonium excreted by the fish is typically transformed to less toxic nitrate by microbial activity in bioreactors. However, nitrate-nitrogen load can be harmful for the receiving water body when released from the RAS facility. A new type of water treatment system for a RAS was designed, including a passive woodchip denitrification followed by a sand filtration introduced into a side-loop of an experimental RAS, rearing rainbow trout (Oncorhynchus mykiss). In the process, woodchips acted as a carbon source for the denitrification, aiming at a simultaneous nitrogen removal and reduction of water consumption while sand filtration was used to remove organic matter and recondition the circulating water. A variety of chemical analyses and toxicological

SUBMITTER: Lindholm-Lehto P 

PROVIDER: S-EPMC7192871 | biostudies-literature | 2020 May

REPOSITORIES: biostudies-literature