Denitrification in gravel-pit lakes |
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Authors: | Christine Helmer Louis Labroue |
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Affiliation: | (1) Laboratoire d Hydrobiologie, UA 695 CNRS, Université Paul Sabatier, 118 route de Narbonne, 31062 Toulouse Cédex, France |
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Abstract: | By constructing a budget of nitrate inputs and outputs in several gravel-pit lakes and directly measuring denitrification through the emission of N2O (using acetylene method), it was possible to evaluate the depolluting activity in the lakes in relation to groundwaters. Seasonal monitoring of the denitrification process allowed us to appraise the influence of various factors such as nitrate concentration, the bioavailability of carbon compounds and the temperature. The application of denitrification towards an improvement of the quality of the water pumped in the wellfields is discussed. |
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Keywords: | nitrates denitrification gravel-pit lake groundwater wellfields |
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