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08-09-2018 | Original Paper | Issue 6/2019

Bulletin of Engineering Geology and the Environment 6/2019

Candidate areas for wastewater stabilization ponds utilizing GIS and metal adsorption capacities of native clayey deposits: Mornag case study (NE Tunisia)

Journal:
Bulletin of Engineering Geology and the Environment > Issue 6/2019
Authors:
Jamel Ayari, Rim Azouzi, Abdelkrim Charef, Amor Smati

Abstract

The main objective was to determine candidate areas for proposed wastewater stabilization ponds (WSPs) to treat municipal wastewater from rural communities in Mornag, Tunisia. To attain our goal, geology, topography, proximity to surface water, proximity to residential areas and proximity to main roads were gathered and analyzed in a geographic information system. For each criterion, a suitability map was created by classifying the study region into two discrete categories: suitable and unsuitable areas. A final suitability map showing candidate areas for WSPs was produced by overlaying different resulting criteria maps. Then, batch adsorption experiments and infiltration–percolation tests by experimental column were carried out to determine the efficiency removal of native clayey deposits of candidate areas for Pb, Cd and Cu in the presence or absence of organic matter, in order to verify their potential use as filter substrate of heavy metals from treated wastewater by WSPs. The performances of filter materials used in wastewater treatment systems were determined. Thus, their lifetime could be estimated.

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