Study of The Sorption of The Total Phenolic Compounds From Olive Mill Wastewater By Natural Soils: Conventional and Under Microwave Irradiation Kinetics.
Abstract The elimination of total phenolic compounds (TPC) from olive mill wastewater was studied by sorption under the conditions: conventional and under microwave irradiation on previously characterized soils. The sorption process has been studied in batch using inorganic materials in their natural states for sustainable development.The characterizations of the soils have shown variability in potential of hydrogen (4.6-8.9) in total nitrogen between 0.5 and 2.5% and in mineral matter which varies between 5.86 and 15.16%. On the other hand, the mineralogical characterization showed that the three soils are composed of several clay and non-clay minerals.The experimental data were analyzed using reaction models and diffusion models. The pseudo second order kinetic model provides the best correlation. It best represents the kinetics of adsorption by the natural adsorbents N1, N3 and R.The sorption models of LANGMUIR, FREUNDLICH and DUBININ-RADUSHKEVICH were used for the mathematical description of the conventional adsorption equilibrium. The best correlations were obtained with the model of LANGMUIR (r2 > 0.95) on soils N1 and N3 unlike the models of FREUNDLICH and DUBININ-RADUSHKEVICH (r2 < 0.65). The soil R can be represented by the model of FREUNDLICH (r2 ≥ 0.96) and the model of LANGMUIR (r2 > 0.93). The latter is confirmed by the value of the dimensionless coefficient RL. Removal rates of TPC were calculated. The value obtained (71 %) showed that the soil N1 is a good adsorbent. The results are satisfactory and promising.