Stimulating Denitrification in a Marine Recirculating Aquaculture System Biofilter Using Granular Starch as a Carbon Source

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dc.contributor.authorMorrison, Megan M.
dc.contributor.authorTal, Yossi
dc.contributor.authorSchreier, Harold J.
dc.date.accessioned2019-03-29T14:52:24Z
dc.date.available2019-03-29T14:52:24Z
dc.date.issued2008
dc.description.abstractMaintaining superior water quality in intensive recirculating aquaculture systems (RAS) by controlling levels of inorganic nitrogenous waste—ammonia, nitrate and nitrite—derived from uneaten food and fecal excretion is often a challenge. In most systems, solids are removed mechanically and ammonia is oxidized to nitrate by nitrifying biological filtration; nitrate is subsequently eliminated through numerous water exchanges. Alternatively, nitrate removal is achieved using a bacterial-mediated denitrification component that reduces nitrate to nitrogen gas under anoxic conditions, a process that depends on the application of external or endogenous electron and carbon donors, e.g. carbohydrates or organic alcohols. In this study, we compared the capacity of acetate, glucose, soluble starch, and granular starches to promote the denitrifying activity of heterotrophic bacteria in biofilm-coated polyethylene beadsfrom a marine RAS moving bed bioreactor (MBB) under anaerobic conditions. Granular starches (corn, wheat, and rice) were as effective as glucose in supporting denitrification, and were 7.6 and 9.8 times more effective in removing nitrate when compared to soluble starch and acetate, respectively. Furthermore, granular starches retained their denitrification potential for longer time periods than soluble starch or acetate. The low cost, ease of use, and non-toxic nature of granular starches make them an ideal exogenous carbon source for promoting denitrification in RAS bioreactors.en_US
dc.description.sponsorshipWe thank Steve Rodgers, Eric Evans and the staff of the Center of Marine Biotechnology's Aquaculture Research Center for their assistance in this research. This work was funded, in part, by the Living Marine Resources Cooperative Sciences Center (LMRCSC) of NOAA's Educational Partnership Program and Research Grant No. IS-3424-03 from BARD, the United States-Israel Binational Agricultural Research and Development Fund. Megan Morrison was a LMRCSC graduate fellow. This is manuscript number 05-125 from the Center of Marine Biotechnology at the University of Maryland, Baltimore, MD, USA.en_US
dc.description.urihttps://ejournals.lib.vt.edu/ijra/article/view/1423/1966en_US
dc.format.extent12 pagesen_US
dc.genrejournal articles preprintsen_US
dc.identifierdoi:10.13016/m2bhyf-jzyx
dc.identifier.citationMegan M. Morrison, Yossi Tal, Harold J. Schreier, Stimulating Denitrification in a Marine Recirculating Aquaculture System Biofilter Using Granular Starch as a Carbon Source, Vol 9 (2008), Morrison , https://ejournals.lib.vt.edu/ijra/article/view/1423/1966en_US
dc.identifier.urihttp://hdl.handle.net/11603/13269
dc.language.isoen_USen_US
dc.publisherInternal Journal of Recirculating Aquacultureen_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Department of Marine Biotechnology
dc.relation.ispartofUMBC Faculty Collection
dc.relation.ispartofUMBC Biological Sciences Department
dc.rightsThis item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author.
dc.subjectfixed bed biofilteren_US
dc.subjectheterotrophic denitrificationen_US
dc.subjectmoving bed bioreactoren_US
dc.titleStimulating Denitrification in a Marine Recirculating Aquaculture System Biofilter Using Granular Starch as a Carbon Sourceen_US
dc.typeTexten_US

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