One of the problems that most affect humanity today is the wastewater discharge into different water bodies. It was estimated that more than 7 million tons of wastewater are generated worldwide and are discharged into rivers, lakes, and reservoirs. Among the most dangerous wastewaters are those from inorganic chemistry research laboratories, mainly due to heavy metals. These problems have become a highly relevant topic, and numerous researchers have tried to design wastewater treatment systems that will deal more efficiently with heavy metals elimination. In this work, the synthesis, characterization, and evaluation of hydrated aluminium silicate were performed as alternative wastewater treatment from chemistry research and teaching laboratories. The compound obtained was Al 2 O 3 3SiO 2 H 2 O , which was characterized by the determination of its physicochemical properties. These revealed a low density, very porous material, with low crystallinity, strong chemical resistance, a large surface area, and a high apparent ionic exchange capacity. Absorption kinetics studies of heavy metals in aqueous solutions, through more widespread models, have demonstrated that Al 2 O 3 3SiO 2 H 2 O has excellent properties as absorbents of this material. The amorphous hydrated aluminium silicate achieves a decrease in the concentration of all the metal ions studied, reducing them to discharge levels permissible. The discharge of large wastewater volumes into the environment is currently one of the major environmental pollution concerns 1-4. Among the more common and harmful pollutants are heavy metals, which produce a vast amount of emissions worldwide (just considering the industrial facilities of the European Union member countries, 3,598 tons of heavy metals were discharged into the water in 1 year) 5,6. Discharges of wastewater from various industrial activities such as electroplating, paint production, plastics, metal materials, mining, some energy producers, and welding materials are the main sources of discharges of heavy metals content into the environment 7-10. Thus the great importance of identifying, evaluating and knowing more about the effects of the species present in these residues in order to avoid present and future damage through responsible, safe, efficient, legal and low-cost wastewater management 11-14. The toxicity of metals depends on the chemical species in which it is part, the routes of administration, and the optimal concentration levels above which they are toxic 15,16. Usually, results when an organism is subjected to an excessive concentration of the metal for an extended period, when it appears in a specific biochemical form or when the organism absorbs it by an unusual route 17,18. Since both the deficiency and the elevated levels of many metallic species can lead to adverse effects for health and the environment; Various studies have been documented on the need for them to be discharged at adequate levels. From this problem on the protection of the environment and human health; Considerable attent...

The mathematical, multiphysic, multidimensional, and electrochemical modelation of a high temperature solid oxide fuel cell system (planar electrolyte-supported configuration) is discussed in the present paper. The mass transport within the cell is studied using the Stefan-Maxwel model, and the momentum balance is solved by means of Navier-Stokes and Brinkman equations, respectively. On the other hand, the energy balance includes the generation term coupled with the convection and conduction equations. It was demonstrated that the diffusion resistances play an important role in the cell performance, and the oxidant concentration is enough high to work at fuel utilization coefficient of 0.8. The current density suffers a reduction (10 A/m 2 to 1.5 * 10 −3 A/m 2 ) due to the variation of reactants concentration at the cell outlet and the diffusive flux resistances. The developed models can be used to further analyses and to study a solid oxide fuel cell working with other fuels but hydrogen.

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