Response of sediment biofilm to increased dissolved organic carbon supply in groundwater artificially recharged with stormwater |
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Authors: | Arnaud Foulquier Florian Mermillod-Blondin Florian Malard Janine Gibert |
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Institution: | 1.Université de Lyon,Lyon,France;2.Université Lyon 1,Lyon,France;3.UMR CNRS 5023, Ecologie des Hydrosystèmes Fluviaux,Villeurbanne,France |
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Abstract: | Purpose Best management practices encompass diverse artificial groundwater recharge (AGR) systems that heavily rely upon the capacity
of the soil and vadose zone to retain large quantities of organic matter generated during stormwater runoff on urban catchments.
However, the supply of stormwater-derived dissolved organic carbon (DOC) at the water-table region of aquifers can enhance
the rate of biogeochemical processes by fueling heterotrophic microbial metabolism. This study examined changes in the abundance
and activity of sediment biofilm in response to increased DOC supply at the water table of an urban aquifer intentionally
recharged with stormwater. Changes in microbial abundance and activity under field conditions were compared with those measured
in laboratory slow filtration columns supplied with an easily biodegradable source of DOC. |
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