B. Pieczykolan, I. PÅ‚onka
Silesian University of Technology, Faculty of Energy and Environmental Engineering, Gliwice, PL

APPLICATION OF EXCESS ACTIVATED SLUDGE AS WASTE SORBENT FOR DYES REMOVAL FROM THEIR AQUEOUS SOLUTIONS


Organic dyes are widely used in many industries (textiles, food, cosmetics, medicine and biology). These plants produce wastewater containing dyes. Even small amounts of dyes can cause a strong coloring of wastewater. Therefore, it is very important to effectively remove residues of these pollutants from the wastewater, before discharging them into the environment. The sorption process is one of the methods used to remove dyes. However this method is often unprofitable economically in comparison with other dye removal processes, due to the high cost of commercial sorbents. Therefore, research is currently conducted in order to find waste materials that can be used as sorbents. The sorption process of two dyes were carried out (Acid Red 18 and Acid Green 16) with the use of dried excess sludge. The activated sludge (excess) came from a municipal sewage treatment plant that purifies wastewater from carbon, nitrogen and phosphorus compounds. During the study the most favorable pH of the process and the contact time of the sorbent with aqueous solutions of the dyes were determined. In addition, for established process parameters, a sorption isotherm was examined. Moreover the isotherm type was determined by analyzing various sorption models.

Keywords: dye, sorption process, waste sorbents, excess activated sludge, sorption isothe