UNIVERSITY OF ABDELHAMID IBN BADIS – MOSTAGANEM FACULTY OF SCIENCE Option : Process Engineering ADSORPTION TESTS OF INDUSTRIAL DYES BY HYDROXYDES OF METALS By Miss BERRACHED Rahma, Mrs H. AIT MAHAMED, Mr A. IDDOU July A poster presented at the 17th International Conference on Chemical and Biological Engineering

2 Research in Environment Improve the performance of the existing systems Dévelopment of innovating systems Energy autonomy Reuse of treated water Production of biopolymers Recovery of solvents or metals Treatment Processes Biologic Treatment Physico-chemical Treatment Biologic Treatment Activated mud Bacterian bed Biologic Disc Lagunage Physico-chemical Treatment Coagulation - Floculation Generation of muds Our Study Contribution for dealing with wastes Use of materials Elimination of a pollution dissolved in water Advantage to be regenerable ADSORPTION

Discussion 3 Orange S-RL 150 HFt HF S-BL bleu HFt HF S-RL 150 Results of the kinetics of adsorption of the orange S-RL 150 dye, on the différent materials and at différent pH 3, 6.7 and 9, show that the fixation of the dye occurs very quickly and the equilibrium point is reached after 30 min.

When comparing the kinetics of fixation of the orange S-RL 150 dye on the materials HF and HFT, we notice that the thermal change of HF improves adsorption, and the adsorbed quantity increases compared to that of the basis material. In fact, the adsorbed quantity is around 21 mg/g. In the same way, for the material HA, the adsorbed quantity is favorable for HAt compared to HA with an adsobtion capacity of about 24 mg/g. Elsewhere, it must be noted that adsorption is favorable for a pH =3. S-BL Bleu The same observations can be emitted for the case of the blue S-BL dye, with an equilibrium reached after 20min. Adsorption in this case is not impacted by the pH change and the quantities vary withithin a range of values going from 10 to 16 mg/g whatever the matérial. 4

In conclusion, we can say that the materials used havent a high affinity with organic pollutants such as the dyes taken as samples We can also say that:  The kinetics in all case, that is for all materials and the two dyes, is very quick and the equilibrium is reached after 20 minutes;  The kinetics of the elimination of the orange S-RL 150 has shown a slight influence of pH;  The kinetics of the the blue S- BL elimination of is not impacted by the pH de of the aqua solution; This work is a preliminary study to contribute to the propositions of dyed water treatment. It is still at the research stage It would be pertinent to go further in this study by investigating the following paths:  To characterize the materials by IR, DRX et MEB methods to make sure of their structure;  Optimize the mass of the materials;  To treat the materials by using other methods. 5