Abstract
Abstract The removal of color from textile mill effluents has been a major problem for many years. Some types of dyes are extremely resistant to degradation or removal by conventional methods of waste treatment. Among these removal methods are coagulation, extended aeration with a biological seed, activated carbon column adsorption and reverse osmosis. Studies were carried to assess the capability of four different charcoals, pine tree, chestnut tree, beech wood and oak tree, to remove industrial dyestuffs. The results show that the fluted charcoal like the pine tree or the chestnut tree is a better material than the lamellar charcoal like the beech wood or the oak tree. The Basic Red 22 (cationic dyestuff) is more easily removed than the Acid Blue 25 (anionic dyestuff), with a better affinity for the charcoal than for the peat. This rustic material can compete economically with more elaborated materials such as activated carbon for example.
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