Wastewater from textile industry contains various
contaminants, among them dyes being considered to be highly toxic to the
aquatic biota. The aim of this paper was to investigate in batch experiments
the decolorization of synthetic aqueous solutions containing some cationic
and anionic dyes by sorption on ligno-cellulosic solid wastes, such as
softwood sawdust. Operating variables studied were: pH, sorbent dose and
particle size, dye concentration, temperature and contact time. The sawdustdye
sorption systems were described using Freundlich and Langmuir
isotherm models. The obtained results allow to estimate that the sawdust can