AvaliaÃÃo dos resÃduos argiloso proveniente da indÃstria do alumÃnio como adsorvente de corantes tÃxteis

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

The environmental impact caused by the textile industries generation of liquid effluents has been a major concern. One major environmental problem caused by the textile dyeing process in industrial laundries is the large amount of effluents which contain a high amount of toxic substances such as the dye itself. Removal of color from the effluents is fundamentally important for environmental control since the dye interferes with the biological processes in the aquatic ecosystems. This paper aims to contribute with information that will help to minimize these environmental problems as well as to review existing textile effluents decoloring systems and to propose a technical system that is economically viable and that can be used by small to medium-sized companies. The use of a clay-like sludge readily available from the aluminum rolling industry was studied as an adsorbent. It uses an effluent decoloring process which is typical of cloth dye laundromats. In order to evaluate the efficiency of the filtering earth used as a dye adsorbent, three dyes were used: Remazol Black B, Remazol Red RB133 and Solophenyl Red 3Bl since they are representative of the coloring process and belong to different classes. Two studies were performed, one using chemical and another using thermal (calcination) activation of the adsorbent to find optimal conditions for the process at reduced costs. The kinetic and equilibrium in finite bath studies allowed to determine maximum adsorption capacity for each dye in three pH values. The results obtained for the calcinated residue indicated that the most removal is obtained with a larger mass (6g), less agitation (300 rpm) and lower pH (4,0). However, for adsorption capacity, maximization was obtained with amounts below entry variables: pH, mass and speed of agitation. Chemical activation of the residue was shown to be efficient with a high percentage of dye removal of up to 97%. However, a change in the solutionâs final color did now turn out to be a good alternative and the thermal activation, therefore, became the best choice. The results for the heat-activated residue (500 ÂC) was shown to have good process potential since the numbers obtained in the decoloring process were above 80% with an adsorption kinetic taking less time (<5min) than the other adsorbents used as comparison in the study; it then can be concluded that the proposal presented in this work is shown to be a viable and promising alternative to replace the high-cost physical-chemical methods in use

ASSUNTO(S)

indÃstria tÃxtil laminaÃÃo do alumÃnio terra de filtragem aluminum rolling adsorÃÃo textile industry engenharia quimica adsorption filtering earth

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