Abstract
Due to population growth and the intensification of economic activity, the production of solid waste is constantly increasing in Morocco [1]. Several programs consist of the establishment of controlled landfills and the rehabilitation of uncontrolled landfills. The impact of landfilling is the production of liquid effluents rich in organic, mineral, and metallic matter called leachate [2,3]. The choice of leachate treatment is based on the characteristics of the leachate. Any treatment process has advantages and limitations, so before proceeding with the treatment it is necessary to characterize the leachate to choose the appropriate process [11]. The objective of this study is to prepare synthetic leachate based on the characteristics of real leachate (case of the controlled landfill of Al Hoceima), in order to carry out treatability tests of this synthetic leachate by controlling the various parameters of analysis. This solution was made from organic (CH3CO2H, CH3CO2Na) and inorganic compounds (MgSO4, CaCl2, Ca(OH)2, NH4Cl, KOH, MgCl2), the various analyzes of this solution gave values comparable to the real solution. This work was devoted to carrying out the treatability tests of synthetic leachate by a process of adsorption on bentonite, by studying its yield to reduce the organic load.
Highlights
The controlled landfill is an ultimate link in any waste treatment sector, it is the place of elimination or storage of the final residues of the refuse treatment chains ; if they are well elaborated, and in many situations ; it is still the only form of waste treatment [2]
The synthetic leachate used for the experiments is a fluid synthesized in the laboratory to represent the same physicochemical characteristics of the real leachate from the Al Hoceima controlled landfill
The synthetic leachate used in this study is prepared in the laboratory basing on the concentrations of the compounds used in the study by D
Summary
The controlled landfill is an ultimate link in any waste treatment sector, it is the place of elimination or storage of the final residues of the refuse treatment chains ; if they are well elaborated, and in many situations ; it is still the only form of waste treatment [2]. The leachate designates any filtering liquid by percolation through the waste landfilled or contained therein, by being bacteriologically and chemically charged with dissolved and suspended organic and/or mineral substances [5,6], leachate characteristics vary from region to region and seasonally [7]. It must be treated before discharging into the natural environment to avoid environmental and/or health impacts and to meet the requirements of discharge standards [8,9], on the other hand, the continuous production of leachate constitutes a persistent threat to local waters, both surface and deep. The objective of this study is to prepare synthetic leachate based on the characteristics of the real leachate from the Al Hoceima controlled landfill and to perform treatability tests of this leachate by modifying and controlling the analysis parameters, in particular the COD
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