Informations et ressources scientifiques
sur le développement des zones arides et semi-arides

Accueil du site → Master → Arabie Saoudite → Removal of Heavy Metals from Wastewater by Modified Local Clay Minerals

King Abdulaziz University (2014)

Removal of Heavy Metals from Wastewater by Modified Local Clay Minerals

AL-GHANMI, HATEM MOHAMMED

Titre : Removal of Heavy Metals from Wastewater by Modified Local Clay Minerals

Auteur : AL-GHANMI, HATEM MOHAMMED

Université de soutenance : King Abdulaziz University

Grade : Master 2014

Résumé
This thesis studied the local Saudi clay minerals ability in removing the harmful heavy metals discharged from industrial wastewater streams. After being activated by sulfuric acid under reflux conditions the clay minerals were subjected to analysis by normal analytical techniques and normal wet chemical methods to get understand the elements present in the separated local clay minerals. X-ray diffraction used to assign the chemical composition of the isolated clay minerals. The selected activated clay minerals were used to separate two hazardous metal ions from their artificial waste solutions. These elements were zinc and lead. Additional study on adsorption kinetics and mechanisms were carried out to examine the behavior of activated clay and understand the physicochemical properties for this activated clay. Activated clay showed excellent adsorption of some of the elements during the adsorption process from tested metal solutions while others had less tendency in removal. Generally, the results suggest the feasibility of local clay minerals as powerful means in removing the hazardous organic compounds in wastewaters. The obtained results on Lead removal showed the capability of clay in removing Lead and Zinc ions, and several factors affecting this process, however, solution pH found to be have highest impact among the tested conditions and optimum pH found to be about 6.0 and 5.2 for lead and zinc respectively. Langmuir and Freundlich adsorption equilibrium isotherm models were applied in order to understand adsorption isotherm, results showed that both model are fit. This indicates the random and nonspecific adsorption sites at clay surface naturally occur. to different kinetic models for the adsorption by clay. This was performed to get insights into the mechanism of the adsorption process. Pseudo first order kinetics and Pseudo second order kinetics models were applied for both metals removal data obtained. Comparing Pseudo second order with Pseudo-first-order, Pseudo-second-order found to have better representation for reaction kinetics with correlation coefficient (R2-value) is equal to 0.998 and 1 for Zinc and lead respectively.

Présentation

Page publiée le 4 décembre 2014, mise à jour le 9 novembre 2017