Team:Lyon-INSA-ENS/Project/Presentation

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        <img src="https://static.igem.org/mediawiki/2011/0/0e/Drapeau_francais.jpg"; width=20px; /> <a href="/Team:Lyon-INSA-ENS/HomeFr">Version Francaise</a>
 
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                                        <!-- Description projet -->
 
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    <h1 style="color: white;"> A project anchored at the heart of current concerns </h1>   
 
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Environment and risks prevention issues are a major stake in our society. The Rhône-Alpes region has
 
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understood that very early, especially through the importance of its chemical and nuclear activities.
 
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Industrial wastewater treatment permits their reuse in industrial use and improve their quality, enabling
 
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compliance with discharge standards. Various processes are currently implemented to clear the wastewater
 
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from its contaminants (e.g. biological, membrane liquid-solid separation, physical, chemical and thermal
 
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processes). One of them is bioremediation.
 
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It embraces processes that use microorganism metabolism to remove pollutants from a contaminated
 
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environment. This rather new approach, the less expensive to put in place, is especially interesting in the
 
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treatment of poorly contaminated effluents.
 
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However, these microorganisms must respect a few criteria: <br/>
 
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- harmlessness towards the environment and human nature,  <br/>
 
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- easiness of cultivation, <br/>
 
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- tolerance to treated pollutant(s), <br/>
 
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- ability to be separated from the treated effluent. <br/>
 
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It is in compliance with this latter requirement that lies our project. In fact, the immobilization of bacteria on
 
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a solid support makes it possible to retrieve more easily the residue in treated wastewater.
 
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The activity of modern nuclear power plants with pressurized water reactors generates radioactive
 
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effluents that contain among other things radioactive cobalt.
 
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The tubing of the cooling circuit is made of a steel alloy rich in stable cobalt (59Co).
 
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Undergoing neutron bombardment coming from the reactor, this stable cobalt
 
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changes into its radioactive isotope, cobalt 60 (60Co).
 
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The capture of this metal is interesting on a sanitary point of view, because it
 
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represents a danger under both its radioactive and stable forms (carcinogenic). It
 
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also represents an advantage on an environmental point of view, in order to avoid
 
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contamination of waters, soil and groundwater. Even with a short half life,
 
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cobalt 60 emits high intensity gamma rays, and decays to nickel, which is stable but
 
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polluting.
 
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Controlled immobilization of radioactive cobalt is both an important sanitary and environmental issue, which
 
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we intend to solve with an innovative and economical response.
 
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Latest revision as of 13:25, 12 September 2011