Application of nitrification and denitrification processes in a direct water reuse system for pacific white shrimp farmed in biofloc system |
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| Institution: | 1. Federal University of Santa Catarina, Chemical and Food Engineering Department, Florianopolis, SC, Brazil;2. Federal University of Santa Catarina, Aquaculture Department, Florianopolis, SC, Brazil;1. Aquaculture and Fisheries Group, Department of Animal Sciences, Wageningen University and Research, PO Box 338, 6700AH Wageningen, the Netherlands;2. Farm Technology Group, Department of Plant Sciences, Wageningen University and Research, P.O. Box 16, 6700 AA Wageningen, the Netherlands;1. AQUOS-Aquatic Organisms Health Laboratory, Aquaculture Department, Federal University of Santa Catarina (CCA, UFSC), Rodovia Admar Gonzaga 1346, 88040-900, Florianópolis, SC, Brazil;2. Chemical Engineering Department, Federal University of Santa Catarina, Brazil;3. Aquaculture Department, Federal University of Santa Catarina, Brazil;1. Escuela de Ciencias del Mar, Pontificia Universidad Católica de Valparaíso (ECM-PUCV), Avenida Altamirano 1480, CP 2340000, Valparaíso, Chile;2. Programa de Pós Graduação em Aquicultura, Universidade Federal do Rio Grande (FURG), Rua do Hotel, n°2, Cassino, 96210-030, Rio Grande, RS, Brazil |
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| Abstract: | The aim of the present study was to propose a low-cost nitrogen removal system through the nitrification / denitrification process in order to maintain the water quality required for the Pacific white shrimp superintensive cultivation in closed systems without water renewal. The increase in productivity consequently causes the accumulation of organic matter and nitrogenous compounds, especially ammonia nitrogen and nitrite, which in high concentrations can be lethal to aquatic organisms. In addition, the accumulation of solids in the system provides conditions for the emergence of opportunistic pathogens, microalgae booms, and increases the producer's cost of inputs to maintain the equilibrium physicochemical relationships required for shrimp farming. The experimental productive cycle lasted 36 days using Litopenaeus vannamei shrimps with 7.1 g ± 0.56 g and density of 350 shrimps m?³. The nitrogen removal efficiency observed during the study period was 71.3 ± 5.3 %, and the shrimp had a survival of 92.9 % and a final weight of 13.1 ± 1.4 g. Thus, we established a system (ammonia and nitrite), capable of managing solids without interaction with the sea, ensuring high biosecurity against exogenous diseases in marine shrimps farms. |
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| Keywords: | Nitrification Denitrification Superintensive system Shrimp Biofloc Aquaculture |
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