Experimental Design and Response Surface Methodologies Use for the Treatment of Leachates by Electrocoagulation Process
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ORIGINAL ARTICLE
Experimental Design and Response Surface Methodologies Use for the Treatment of Leachates by Electrocoagulation Process E. Selmane Bel Hadj Hmida1,2 · H. Abderrazak3 · T. Ounissi1 · K. Djebali4 Received: 31 January 2020 / Accepted: 19 May 2020 © The Tunisian Chemical Society and Springer Nature Switzerland AG 2020
Abstract In order to optimize conditions for the treatment of leachates by electrocoagulation process by using aluminum (Al) electrodes, the experimental design methodology was applied. Indeed, all factors considered have an important effect to treat leachates which likely contaminate groundwater, rivers and grounds. The investigated variables were initial pH (U1), reaction time (U2) and applied current density “J” (U3). The response surface methodology was applied by using the Doehlert Matrix. The statistical analysis was performed by using NemrodW software (LPRAI, version 2000). Suitability of the model and the success of Doehlert Matrix design for the optimization of the electrocoagulation process indicates that the predicted and experimental values were in fair agreement. In addition, the postulated model is valid and predictive. According to the response surface methodology, the optimal conditions for 98% of COD and 97% of color intensity removal responses were found at the current density 14.4 mA cm−2; the reaction time 72.5 min and the initial pH 6.2. Keywords Leachates · Electrocoagulation process (EC) · Chemical oxygen demand (COD) · Color intensity · Response surface methodology (RSM)
1 Introduction The population growth in addition to the increase of the anthropogenic activities had resulted in a large rise of municipal as well as industrial solid waste production (SWP) for nearly all the countries around the word. As a consequence, a fundamental interest in the SWP manage Electronic supplementary material The online version of this article (https://doi.org/10.1007/s42250-020-00149-0) contains supplementary material, which is available to authorized users. * E. Selmane Bel Hadj Hmida [email protected] 1
Laboratoire de Chimie Analytique et Electrochimie, Département de Chimie, Faculté des Sciences de Tunis, Campus Universitaire, 2092 Tunis, Tunisia
2
Institut préparatoire aux Etudes d’Ingénieurs El Manar, Campus Universitaire, 2092 Tunis, Tunisia
3
Laboratoire des Matériaux Utiles, Institut National de Recherche et d’Analyse Physico-Chimique, Technopole Sidi Thabet, 2020 Ariana, Tunisia
4
Espace d’Appui à la Recherche et de Transfert Technologique, Centre de Biotechnologie de Borj-Cedria (CBBC), BP‑901, 2050 Hammam‑lif, Tunisia
is crucial to avoid an environmental catastrophe. Nevertheless, landfilling remains the most used technique, owing to its economic advantages, for the ultimate disposal of solid waste material [1]. The capital of Tunisia represents an example with the most densely populated region in the country including a large agglomeration and a constantly expanding industrial activity. Borj Chekir landfill which was created in 1999 o
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