Comparison of the advanced oxidation processes and adsorption with chitosan-zeolite composite in reducing the amount of airport waste water containing glycol pollution

In recent years, several methods have been considered, which include the use of adsorbents, and photo catalytic materials and carbon materials, and the most common methods for the removal of water pollutants and wastewater is the use of adsorption process by adsorbents. In this study, zeolite adsorbents, chitosan powder and synthesized chitosan-zeolite composite were used, and their application was studied to remove the cationic contaminants, ethylene glycol, from aqueous environments of airport s contaminated wastewaters in different conditions in a discontinuous manner. Non-continuous adsorption experiments were conducted to examine the effect of the factors on the removal process, including the effect of contact time of absorbent with waste water contaminant, pH, waste water initial concentration of the pollutant and the amount of consumed adsorbent. For each adsorbent, the effect of pH was considered in the range of 4 to 10, the amount of adsorbent was 0.1, 0.5, 1 and 2 g, and the concentration of contaminant was 400, 600, 800 and 1000 mg per liter. To optimize the absorption time, 30, 60, 90 and 120 min were selected. The results indicate that chitosan-zeolite composite is suitable for adsorption of ethylene glycol from industrial wastewaters, and as absorbent weight increases, the absorption rate increase too. The results of the experiments showed that the adsorbent is equilibrated with a solution of ethylene glycol for about 30 min.