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Etude et modélisation d'un procédé innovant de traitement de l'eau : l'airlift sous dépression ArchiMer
Barrut, Bertrand; Blancheton, Jean-paul; Rene, Francois; Champagne, Jean-yves; Grasmick, Alain; Bosc, Pierre.
Tipo: Text
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00050/16089/13566.pdf
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Foam fractionation efficiency of a vacuum airlift—Application to particulate matter removal in recirculating systems ArchiMer
Barrut, Bertrand; Blancheton, Jean-paul; Callier, Myriam; Champagne, Jean-yves; Grasmick, Alain.
The accumulation of particulate organic matter (POM) in recirculating aquaculture systems (RAS) has become an important issue with the intensification of finfish production. The objective of this study was to assess the foam fractionation efficiency of a vacuum airlift in different conditions (POM concentrations, airflow rates, bubble sizes, water renewal rates and feed addition). In sea water, the vacuum airlift allowed removing 20% of the initial POM concentration per hour (foam fractionation efficiency), corresponding to a 20.7-fold concentration factor between the tank and the foam. In rearing conditions, efficiency increased with decreasing water renewal rate or increasing POM concentration. An increase in airflow rate from 10 to 80 L min−1 in the...
Tipo: Text Palavras-chave: POM; Vacuum airlift; Foam fractionation efficiency; RAS; Aquaculture.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00138/24910/23576.pdf
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Mass transfer efficiency of a vacuum airlift-Application to water recycling in aquaculture systems ArchiMer
Barrut, Bertrand; Blancheton, Jean-paul; Champagne, Jean-yves; Grasmick, Alain.
In aquaculture, oxygen transfer and carbon dioxide stripping are the first limiting factors to fish rearing intensification. In this study we measured the O-2 and CO2 mass transfer coefficient (K(L)a) for a vacuum airlift in fresh (<1% salinity) and sea water (35 parts per thousand salinity) recirculating aquaculture systems (RAS). The airlift was composed of two concentric tubes: an inner riser tube and an external downcomer tube and can be adjusted at three different heights: 2,4 or 6 m. Several types of air injectors were tested, delivering different sizes of bubble swarms depending on their porosity and functioning conditions (low or high injection pressure), with air flows varying from 0 to 80 L min(-1). Experiments were also carried out at...
Tipo: Text Palavras-chave: Mass transfer; Airlift; Vacuum; Aquaculture; RAS; Aeration; Degasification; Salinity.
Ano: 2012 URL: http://archimer.ifremer.fr/doc/00072/18324/16001.pdf
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Separation efficiency of a vacuum gas lift for microalgae harvesting ArchiMer
Barrut, Bertrand; Blancheton, Jean-paul; Muller-feuga, Arnaud; Rene, Francois; Narvaez, Cesar; Champagne, Jean-yves; Grasmick, Alain.
Low-energy and low-cost separation of microalgae from water is important to the economics of microalgae harvesting and processing. Flotation under vacuum using a vacuum gas lift for microalgae harvesting was investigated for different airflow rates, bubble sizes, salinities and harvest volumes. Harvesting efficiency (HE) and concentration factor (CF) of the vacuum gas lift increased by around 50% when the airflow rate was reduced from 20 to 10 L min(-1). Reduced bubble size multiplied HE and CF 10 times when specific microbubble diffusers were used or when the salinity of the water was increased from 0 parts per thousand to 40 parts per thousand. The reduction in harvest volume from 100 to 1 L increased the CF from 10 to 130. An optimized vacuum gas lift...
Tipo: Text Palavras-chave: Microalgae; Foam; Flotation; Vacuum gas lift; Harvesting efficiency.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00130/24107/22369.pdf
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Water delivery capacity of a vacuum airlift – Application to water recycling in aquaculture systems ArchiMer
Barrut, Bertrand; Blancheton, Jean-paul; Champagne, Jean-yves; Grasmick, Alain.
A study was undertaken to measure the water flow (Qw) delivered by a vacuum airlift designed for recirculating aquaculture systems (RAS) in fresh (<1‰ of salinity) and sea water (35‰ of salinity). The vacuum airlift consists of two concentric tubes connected at their top to a depression chamber. The water rises in the inner tube as a result of air being injected in its lower section and flows back through the external downcomer tube. The vacuum airlift was adjusted at three different lengths: 2, 4 or 6 m and water discharge could be lifted from 0 to 30 cm. Air flow rate (Qg) varied from 0 to 80 L min−1. Different types of air injectors were tested, delivering different bubble sizes (0.1–5 mm) depending on porosity and functioning at low or high...
Tipo: Text Palavras-chave: Water circulation; Airlift; Vacuum; Aquaculture; RAS; Salinity.
Ano: 2012 URL: http://archimer.ifremer.fr/doc/00073/18457/16005.pdf
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