A Case Study for The Evaluation of Different Color Removal Methods carried out on Textile Finishing Wastewater Treated by Sequencing Batch Activated Sludge System (SBASS)

In this study, first of all, removal of dyestuffs from the wastewater ,which is biologically treated but colour removal is not achieved, was investigated by chemical coagulation (FeCl3, FeSO4 and Al2(SO4)3 coagulants), Fenton oxidation (different volume of peroxide and Fe+2) and ozone oxidation(1 gr/h ozone dose) methods. According to the experimental results, maximum color removal efficiencies were determined as 67%, 68 %, 57 %, 95% and 66% (Pt-Co), respectively. Furthermore, since investigated plant’s wastewater is treated in Sequencing Batch Activated Sludge System (SBASS), biological treatability studies were run without/with using different adsorbent materials such as Waste Aluminum Sludge, Granular Activate Carbon (GAC) and Poly Aluminum Chloride (PACl). In these studies, while maximum colour removal efficiencies were determined as 38%, 62% and 44% (Pt-Co) for above mentioned adsorbents, respectively, the study without adsorbent addition was only found as %13 (Pt-Co). By the way, the cost assesment based on COD and Colour removal efficiecies for all methods were estimated. According to this, while the the minimum tretament cost is obtained for Fenton oxidation method, the maximum treatment cost was observed for ozone oxidation method for only 66% colour removal efficiency .