6th ICERAT - International Congress on Environmental Research and Technology, Adana, Turkey, 13 - 14 December 2021, pp.1
Textile industry wastewater has complex properties such as high chemical oxygen demand (COD), color, turbidity, temperature, pH, toxic chemicals and different types of non-biodegradable dyes. When textile wastewater is discharged directly into rivers, it causes pollution of large water bodies, so it must be treated before being discharged. Coagulation plays an important role in the removal of dyes, suspended solids and COD in the pre-treatment of textile industry wastewater. In addition, being simple and easy to apply is among the advantages of this process. Due to its advantages, in this study, the treatability of textile industry fabric dyeing wastewater was evaluated in terms of COD removal efficiency by applying the coagulation process, and ferric chloride (FeCl3), which is widely used in coagulation processes, was chosen as the coagulant. The effectiveness of the coagulation process on COD removal from textile wastewater was investigated depending on pH (4-10), coagulant dosage (0.2-1.0 g/L) and reaction time (15-60 min.) parameters. It was observed that the highest COD removal efficiency was achieved with 72% at pH of 6, FeCl3 dosage of 0.5 g/L, reaction time of 50 min. The obtained COD removal efficiency of 72% showed that the coagulation process can be applied as a pre-treatment process before the dye wastewater is discharged to conventional wastewater treatment plants, or it can be combined with another process to provide full purification.