Water and acrylamide monomer transfer rates from a settling basin to groundwaters
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The aim of this paper was to estimate the potential leakage of acrylamide monomer, used for flocculation in a settling basin, towards the groundwaters. Surface–groundwater interactions were conceptualized with a groundwater transport model, using a transfer rate to describe the clogged properties of the interface. The change in the transfer rate as a function of the spreading of the clogged layer in the settling basin was characterized with respect to time. It is shown that the water and the Acrylamide transfer rate are not controlled by the spreading of the clogged layer until this layer fully covers the interface. When the clogged layer spreads out, the transfer rate remains in the same order of magnitude until the area covered reaches 80 %. The main flux takes place through bank seepage. In these early stage conditions of a working settling basin, the acrylamide flux towards groundwaters remains constant, at close to 10 g/year (±5).
KeywordAcrylamide Water transfer rate Clogged layer Groundwater
This work was funded by the ANR CES project 1443 AquaPOL, Contaminants, Ecosystèmes, Santé 2010. The authors thank the students Lucie MONNIN and Steeven TESSIER from the Geosciences Master’s course at Orléans University for their help during the pumping and tracer tests, the Polytech’Orléans Engineering students Jennifer DEROO and Robin VENAT for their contribution to developing the model and Dr. Elizabeth ROWLEY-JOLIVET for improving the English language.
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