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Analysis of sedimentation and resuspension processes of aquaculture biosolids using an oscillating gridAward-winning

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10.1016/j.aquaeng.2008.01.004
 
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Masaló Llorà, IngridMés informacióMés informacióMés informació
Guadayol, Oscar
Peters, Francesc
Oca Baradad, JoanMés informacióMés informacióMés informació
Document typeArticle
Defense date2008-01
Rights accessRestricted access - publisher's policy
All rights reserved. This work is protected by the corresponding intellectual and industrial property rights. Without prejudice to any existing legal exemptions, reproduction, distribution, public communication or transformation of this work are prohibited without permission of the copyright holder
Abstract
Sedimentation and resuspension processes of aquaculture biosolids (non-ingested feed and faeces) are analysed using vertically oscillating grids as a source of turbulence in fluid tanks. An oscillating grid system consists of a container in which a grid is stirred vertically generating a well-known turbulent field that is function of amplitude and frequency of oscillation, distance between grid and measurement point, and mesh spacing of the grid. The grid used in this study had a mesh spacing of 1.2 cm, and was calibrated using different amplitudes (1, 1.5 and 2 cm), frequencies (from 1 to 6 Hz) and distances (2.4, 2.7 and 3 cm). After calibration, the turbulence needed to resuspend biosolids and to maintain them in the water column following different times of consolidation, and with biosolids of different origin, was analysed. It was observed that the turbulence needed to resuspend aquaculture biosolids increased with the time of consolidation. When the turbulence was decreased after a resuspension process, the next sedimentation of biosolids showed a hysteretic behaviour: turbulence needed to resuspend a fixed percent of biosolids from the tank bottom is substantially higher than that needed to maintain the same percentage suspended in the water column. Differences in resuspension behaviour of biosolids originated in different tanks were also observed. The method provides useful information that can be compared with turbulence generated by fish swimming activity, in order to determine the culture conditions, which can promote self-cleaning conditions in a particular tank.
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Menció d'Honor 2010 que atorga l'Aquacultural Engineering Society
CitationMasaló, I. [et al.]. Analysis of sedimentation and resuspension processes of aquaculture biosolids using an oscillating grid. "Aquacultural engineering", Gener 2008, vol. 2, núm. 38, p. 135-144. 
Award-winningAward-winning
URIhttp://hdl.handle.net/2117/19103
DOI10.1016/j.aquaeng.2008.01.004
ISSN0144-8609
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  • AQUAL - Aqüicultura i QUALitat dels productes aquàtics - Articles de revista [11]
  • Departament d'Enginyeria Agroalimentària i Biotecnologia - Articles de revista [1.161]
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