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ผู้เขียน หัวข้อ: An evaluation of commercially available biological filters for recirculating aqu  (อ่าน 3159 ครั้ง)
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« เมื่อ: กรกฎาคม 03, 2014, 03:28:11 PM »

An evaluation of commercially available biological filters for recirculating aquaculture systems

Todd C. Guerdat a,*, Thomas M. Losordo a, John J. Classen a, Jason A. Osborne b, Dennis P. DeLong a
a Biological and Agricultural Engineering Department, North Carolina State University, Campus Box 7625, Raleigh, NC 27695, USA
b Department of Statistics, North Carolina State University, Campus Box 8203, Raleigh, NC 27695, USA

A B S T R A C T


Three different commercially available biological filters were evaluated in triplicate on a 60 m3 tankbased Tilapia system under commercial warmwater growout conditions. The study was performed at the North Carolina State University Fish Barn?a commercial scale research and demonstration recirculating aquaculture facility operated by the department of Biological and Agricultural Engineering. Total ammoniacal nitrogen (TAN) removal rates were determined for the three types of biofilters for a range of concentrations ranging from 0.13 to 1.20 g TAN m3. TAN concentrations were varied by feed rates and
ammonium chloride additions, and limited by fish feeding response. Maximum feed rates were 65 kg feed d1 using a 40% protein diet at a maximum biomass of 5500 kg. Average observed TAN removal rates (in g TAN m3 of unexpanded media d1  standard deviation) for the three filters were 267  123, 586  284, and 667  344 for the moving bed bioreactor, floating bead filter, and fluidized sand filter, respectively. These results are considerably lower than results previously published at the laboratory scale using artificial waste nutrients. This study highlights

Keywords: Biological filtration Nitrification performance Recirculating aquaculture systems
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