bachelorThesis
Remoção dos corantes azul de metileno e laranja reativo 64 por carvão produzido a partir de lodo de ETE
Fecha
2017-06-14Registro en:
MEDEIROS, Válber Rodrigo Ribeiro de. Remoção dos corantes azul de metileno e laranja reativo 64 por carvão produzido a partir de lodo de ETE. 2017. 60f. Trabalho de Conclusão de Curso (Graduação em Engenharias Química), Departamento de Engenharia Química, Universidade Federal do Rio Grande do Norte, Natal, 2017.
Autor
Medeiros, Válber Rodrigo Ribeiro de
Resumen
The contamination of waterbodies by effluents containing dyes has been an object of attention
to several scholars. The presence of dyes in the water reduces the transparency of the medium,
hindering the penetration of solar rays and, consequently, affecting the execution of
photosynthesis by the aquatic flora. In addition, the use of colored water is extremely limited,
since its aesthetics is an indication of quality and, therefore, essential to the consumer. In this
sense, several methods for treating colored effluents have been developed in the last decades.
Among them, adsorption is certainly one of the most efficient, especially when performed
with activated carbon, which undergoes physical-chemical treatments to ensure a high internal
porosity. However, the cost of obtaining this adsorbent is usually very high. Therefore, as a
less expensive alternative for the removal of dyes, the present work proposes the use of
charcoal – whithout undergoing any activation processes – made from sewage sludge of a
wastewater treatment plant. Starting from synthetic effluents based on methylene blue and
reactive orange 64, the kinetics and the equilibrium of each dye were evaluated, concluding
that methylene blue is adsorbed according to the kinetic model of pseudo-second order and is
best described by the Langmuir isotherm, whereas the reactive orange 64 has its sorption
kinetics responding to the pseudo-first order model and is best represented by the Freundlich
isotherm. Using 0.040 g of charcoal, a 99.51% removal (absence of apparent color) was
obtained for 10 mg/L methylene blue solutions. In the case of the reactive orange 64, using
0.25 g of charcoal, a 93.51% removal (absence of apparent color) was obtained in 10 mg/L
solutions.