BIOSORPTION OF TECHNICAL DIRECT DYES BY ACTIVATED SLUDGE

This study aimed to determine the effect of adsorbent mass, adsorption time and concentration of dye on adsorption efficiency of activated sludge toward technical direct dyes and to know the effect of the adsorption process of the COD (Chemical Oxygen Demand) value in technical direct dyes solution. The subject of this study was activated sludge. The object of this study was the activated sludge adsorption efficiency on technical direct dyes. Adsorption process was done by conditioning the variation of the mass of adsorbent, adsorption time and concentration of technical direct dyes. Technical direct dyes solution before and after adsorption were quantitatively analyzed with a COD reactor. Technical direct black dyes solution after adsorption were analyzed quantitatively by UV-Vis spectrophotometer. Adsorption efficiency expressed in terms of concentration of adsorbed dyes divided by the initial concentration of dye solution and multiplied by 100%. The results showed that: the greater the mass of adsorbent, the higher the adsorption efficiency of activated sludge to technical direct dyes, the longer the time given to the process of adsorption, the higher the adsorption efficiency of activated sludge to technical direct dyes, adsorption efficiency decreases with increasing concentration of technical direct dyes, chemical Oxygen Demand (COD) value technical direct were decrease after adsorption process by activated sludge