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. Professora de magistério superior da UTFPR -Pato Branco (PR), Brasil. Edilson da Silva FerreiraQuímico pela Universidade Federal do Rio de Janeiro (UFRJ) -Rio de Janeiro (RJ), Brasil. Mestre em Química pela UFSC -Florianópolis (SC), Brasil.Professor Titular da UTFPR -Pato Branco (PR), Brasil. Resumo AbstractThe objective of this study was to evaluate the capacity to remove copper ions (II) from synthetic aqueous solutions through biosorption using the fungus Pleurotus ostreatus. The fungus was grown in minimal medium and used as biosorbent dry. It was used a factorial design 2 3 with three replicates at the central point to determine the best working condition and this corresponded to the lowest concentration of biosorbent and longer experiment, removing 86.01% of copper ions (II). Kinetic studies allowed to verify the maximum biosorption revealing that in five minutes biomass reached its saturation capacity. The Langmuir model was the best fit to the experimental data of biosorbent Pleurotus ostreatus.

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The dental wastewater can contribute to the total daily mercury load on the environment. Factorial design of experiments is useful to analyze factors that influence this solubility. The aim of the present study was to design experiments to examine the effects of operational variables, humic acid, temperature, pH and contact time that may affect the solubility of total mercury as dental amalgam residue in reduction process. Based on the factorial design of experiments, the humic acid concentration was the most significant factor in this process, followed by other factors. The parameters affecting the solubility of total mercury showed that when the [HA], T and CT increases and pH decreases there is an important increase of total mercury concentration in process. For the tested conditions, the high total mercury concentration was obtained using the humic acid concentration = 1.0 g L-1 , temperature = 35 o C, pH = 4.0 and contact time = 10 days.