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Comptes Rendus Géoscience
Volume 338, n° 16
pages 1176-1183 (décembre 2006)
Doi : 10.1016/j.crte.2006.09.020
Received : 13 July 2005 ;  accepted : 29 September 2006
Impacts of the dumping site on the environment: Case of the Henchir El Yahoudia Site, Tunis, Tunisia
Impacts des décharges sauvages sur lʼenvironnement ; cas du site Henchir El Yahoudia, Tunis, Tunisie
 

Abir Marzougui , Abdallah Ben Mammou
Laboratoire de ressources minérales et environnement, département de géologie, faculté des sciences de Tunis, campus universitaire, 2092 El Manar Tunis, Tunisie 

Corresponding author.
Abstract

The Henchir El Yahoudia landfill is one among many uncontrolled dumping sites in Tunisia with no bottom liner. It is located at the southeastern edge of Sijoumi Sebkha. The site has been exploited since 1963 until 1994. It constitutes a peculiar case because of its situation, its exploitation mode and the nature of buried wastes. Leachate analysis shows that they are strongly charged with nitrogen (especially ammoniacal and kadjedahl), organic compounds with a high biodegradability and a charge of metallic elements exceeding the Tunisian norm NT 106-002. Sediment analyses show that the highest rate of heavy metals and organic matter coincides with clay-richest layers, characterized by the highest specific-surface values. The percolation of these pollutants until the groundwater between 0.5 and 5 m has provoked a pollution characterized by high rates of organic matter (BOD, COD and nitrogen) and heavy metals. To cite this article: A. Marzougui, A. Ben Mammou, C. R. Geoscience 338 (2006).

The full text of this article is available in PDF format.
Résumé

Le site de Henchir El Yahoudia représente la plus grande et la plus ancienne décharge du Grand Tunis. Cʼest une décharge non contrôlée, qui a connu plusieurs phases dʼexploitation. La localisation de la décharge en bordure de la Sebkha Es Sijoumi et la diversité des déchets qui y sont enfouis représentent les problèmes majeurs du site. Les polluants sont acheminés principalement par les lixiviats. Ces derniers renferment des teneurs en éléments traces, en matière organique et en éléments nutritifs qui dépassent la norme tunisienne NT 106-002, relative aux rejets des eaux usées dans le milieu naturel. En lʼabsence de tout système de collecte de lixiviats, ces effluents sont en contact direct avec le substratum de la décharge. Les analyses minéralogiques et géochimiques montrent que les niveaux argileux du substratum et, particulièrement les smectites, concentrent les éléments traces et la matière organique et représentent une barrière limitant la percolation de la pollution. Ceci nʼa pas empêché la contamination de la nappe, dont le niveau statique est proche de la surface. Pour citer cet article : A. Marzougui, A. Ben Mammou, C. R. Geoscience 338 (2006).

The full text of this article is available in PDF format.

Keywords : Dumping site, Leachate, Substratum, Groundwater, Pollution, Heavy metals, Organic Matter, Tunisia

Mots-clés : Décharge, Lixiviats, Substratum, Nappe, Pollution, Métaux lourds, Matière organique, Tunisie




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