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

Autor: Jouni Vielma, Jani Pulkkinen, Petra C. Lindholm-Lehto, Juha Koskela, Tapio Kiuru
Rok vydání: 2019
Předmět:
Denitrification
Health
Toxicology and Mutagenesis
Recirculating aquaculture system (RAS)
Aquaculture
010501 environmental sciences
01 natural sciences
Slow sand filter
law.invention
Water Purification
chemistry.chemical_compound
Bioreactors
Nitrate
law
Sand
Inductively coupled plasma optical emission spectrometry (ICP-OES)
Water Quality
Environmental Chemistry
Animals
Organic matter
Filtration
0105 earth and related environmental sciences
chemistry.chemical_classification
Nitrates
Recirculating aquaculture system
Ion chromatography (IC)
04 agricultural and veterinary sciences
General Medicine
Pulp and paper industry
Pollution
Inductively coupled plasma mass chromatography (ICP-MS)
Rainbow trout
chemistry
Heavy metals
Gas chromatography (GC)
040102 fisheries
0401 agriculture
forestry
and fisheries
Woodchips
Water quality
Research Article
Zdroj: Environmental Science and Pollution Research International
ISSN: 1614-7499
Popis: 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 tests were performed to study the suitability of the process and to ensure the absence of harmful or toxic substances in the system. The results did not show increased toxicity, and no increased mortality was reported for the raised species. After the start-up of the system, the concentrations of fatty acids (e.g., hexadecanoic acid
Databáze: OpenAIRE
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