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Devenir de la chlordécone en conditions méthanogéniques

Abstract : Following a work published in 1996, it appears that methanogenic Archaea have the enzymatic equipment necessary to attack chlordecone, the organochlorine insecticide used in the West Indies to control populations of the black banana weevil, where this compound is currently responsible for an unprecedented health, environmental and social crisis. The aim of this work was to confirm the capacity of this group of prokaryotes to degrade CLD. It consisted of continuously feeding a small laboratory methaniser for 80 days at room temperature with a culture medium containing 2 mg CLD/L and monitoring the concentration of CLD at the inlet, outlet and in the reactor sludge, as well as the formation of any degradation products and chloride release. The reactor inoculated with the biomass of an industrial methanizer treating rum vinasses showed a methane yield close to the theoretical yield (0.35 m3/kg COD removed) and its sludge had a redox potential (EAg/AgCl = -345 to -434.2 mV), which confirms that it was operating well under methanogenic conditions. A removal of more than 99% of CLD was observed between the inlet and the outlet of the reactor, but only traces of dechlorination products (one monohydroCLD and two dihydroCLD) representing barely 0.17% of the CLD removed could be detected at the outlet of the reactor. No chloride production above background could be measured either, indicating that unidentified dechlorination products were not formed in the system. The results confirm that the methanogenic sludge used had a small dechlorination capacity for CLD, but that this was too low to be able to carry out bioaugmentation using digester sludge in the remediation of CLD-contaminated soil. The main process involved in the removal of CLD between the inlet and the outlet of the operated reactor seems to be a very efficient adsorption of CLD on the biomass of the system, which however remains to be confirmed.
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Submitted on : Saturday, July 16, 2022 - 12:54:10 AM
Last modification on : Wednesday, September 28, 2022 - 4:33:58 AM



Hervé Macarie, Yoan Labrousse, Aurélie Amic, Alain Soler, Sébastien Bristeau, et al.. Devenir de la chlordécone en conditions méthanogéniques. 44e Congrès du Groupe Français des Pesticides, Protection des cultures et santé environnementale : héritages et conceptions nouvelles, Groupe Français des Pesticides, May 2014, Schoelcher (Martinique), France. ⟨ird-03725191⟩



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