Effect of Wastewater Injection on Ground Water Quality

Legeas, M.; Carré, J.; Mérot, Ph.

doi:10.2166/wst.1992.0360

M. Legeas;

M. Legeas

*Ecole Nationale de la Santé Publique, Département Enviwnnement et Santé, Avenue du Professeur Léon Bernard, 35043 Rennes Cédex, France

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J. Carré;

J. Carré

*Ecole Nationale de la Santé Publique, Département Enviwnnement et Santé, Avenue du Professeur Léon Bernard, 35043 Rennes Cédex, France

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Ph. Mérot

**Institut National de la Recherche Agronomique, Département Enviwnnement Physique et Agronomique, 65, route de Saint Brieuc, 35042 Rennes Cédex, France

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Effluents from the treatment plant of Saint Jean de Monts and Saint Hilaire de Riez have been injected into a confined ground water for twelve years. This ground water is connected with the sea. Effluent floats on the surface of the aquifer and it disperses by dilution at the freshwater/salt water interface. The aquifer acts as a direct overflow pipe. The injection of effluent has preserved the quality of waters in the coastal area and in the Breton Marsh.

Waste water outflow, coastal area, injection into ground water, effects

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