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Effects of aerated and non-aerated biofilters on effluent water treatment from a small-scale recirculating aquaculture system for Nile tilapia (Oreochromis niloticus L.)

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dc.contributor.authorGichana, Zipporah
dc.contributor.authorLiti, David
dc.contributor.authorDrexler, Silke-Silvia
dc.contributor.authorZollitsch, Werner
dc.contributor.authorMeulenbroek, Paul
dc.contributor.authorWakibia, Joseph
dc.contributor.authorOgello, Erick
dc.contributor.authorAkoll, Peter
dc.contributor.authorWaidbacher, Herwig
dc.date.accessioned2024-06-26T12:43:04Z
dc.date.issued2019-09-17
dc.descriptionArticle
dc.description.abstractMost recirculation aquaculture systems (RAS) use aerated biofilters to maintain suitable water quality for fish production. However, application of non-aerated biofilters may provide opportunities to lower aeration costs, water usage and concentration of all nitrog- enous wastes in the effluent water. Our study aimed at comparing the biofiltration performance characteristics of two biofilters: a conventional aerated biofilter and a non-aerated biofilter receiving the same effluent water from a small-scale RAS. The two biofilters were evaluated in triplicate and tested concurrently for seven months. Water quality parameters were monitored at the biofilter inlets and outlets and in the fish tanks. At the beginning of the experiment, the concentration of ammonia at the two biofilter outlets were not significantly different. However, the concentrations decreased with time reaching mean values of 1.33 ± 0.02 mg L-1 and 1.23 ± 0.21 mg L-1 N-NH4 in the aerated and non-aerated biofilters, respectively. Whereas phosphorus and nitrate levels were significantly high in the aerated biofilter. There was no significant difference in the growth of fish between the aerated and non-aerated biofil- ters. The results suggest that non-aerated biofilters can be as effective as aerated biofilters in maintaining suitable water quality for O. niloticus production.
dc.description.sponsorshipJKUAT
dc.identifier.citationGichana, Z., Liti, D., Drexler, S. S., Zollitsch, W., Meulenbroek, P., Wakibia, J., ... & Waidbacher, H. (2019). Effects of aerated and non-aerated biofilters on effluent water treatment from a small-scale recirculating aquaculture system for Nile tilapia (L.). Die Bodenkultur: Journal of Land Management, Food and Environment, 70(4), 209-219.
dc.identifier.urihttps://drive.google.com/file/d/1B-gypRj-jLUi94G8Slm47zfBjJaAde-J/view
dc.identifier.urihttps://repository.nrf.go.ke/handle/123456789/973
dc.language.isoen
dc.publisherJournal of Land Management, Food and Environment
dc.subjectAerated
dc.subjectDenitrification
dc.subjectNitrification
dc.subjectNon-aerated
dc.subjectRemoval efficiency
dc.titleEffects of aerated and non-aerated biofilters on effluent water treatment from a small-scale recirculating aquaculture system for Nile tilapia (Oreochromis niloticus L.)
dc.typeArticle
dspace.entity.typePublication

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