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Rôle des zones tampon végétalisées sur les transferts d'azote et de phosphore vers les milieux aquatiques

Abstract : The conservation of water quality is a major issue in the 21th century in particular with the increase in the human population. Water-treatment plants rejections represent a risk of pollution of the receiving environment, in particular in nitrogen and phosphorus, with fatal effects for the health and the environment. It is to limit this pollution that the vegetated buffer zones (VBZs), systems of infiltration, where water and nutrients retention are expected, were developed. This study has for main objective to better understand the transfers of nutrients in this type of system. The impact of the various compartments - soil, vegetation, microflora- was studied in two VBZs ditches type, situated downstream to vegetated water-treatment plants in service and in an experimental zone with controlled modalities. This study demonstrated the importance of site hydraulic, soil texture and VBZ surface in effectiveness of water and nutrients retention. The impact of microbial compartment depends largely on the hydraulic retention time bonds to VBZ surface and oxygenation rate of the effluent. Vegetation allows microbial activity improvement but its role in nutrients retention and removal is minor because of high quantities brought by effluents. The soil is the major compartment in phosphorus retention, although a rapid saturation of soil phosphorus could limit this potential. These observations demonstrate variability in the effectiveness of VBZ in water and nutrients retention. This variability could be minimized by planning and management measures. The study of nutrients transfers deserve to be further study and extended to all types of VBZ.
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https://tel.archives-ouvertes.fr/tel-01726330
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Submitted on : Thursday, March 8, 2018 - 10:55:09 AM
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  • HAL Id : tel-01726330, version 1

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Sarah Koenig. Rôle des zones tampon végétalisées sur les transferts d'azote et de phosphore vers les milieux aquatiques. Géochimie. Université de Strasbourg, 2016. Français. ⟨NNT : 2016STRAH022⟩. ⟨tel-01726330⟩

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