Treatability studies with chemical precipitation and ion exchange for an organized industrial district (OID) effluent in Bursa, Turkey

Treatment studies on the effluents originating from an organized industrial district (OID) wastewater treatment plant were investigated. Wastewater samples were taken from an OID where most of industries consist of textile producers having mainly dying and finishing processes. Chemical precipitation and ion exchange methods were applied to the samples in the lab conditions. Optimum removal efficiencies were determined based on the applications of different chemical species and pH. Ca(OH)2 at pH 11 has provided the maximum removal efficiency in chemical precipitation experiments. In the experiments, removal efficiencies for TSS, COD, Fe, SAC436 (spectral absorption coefficient), SAC525 and SAC620 were 96%, 27%, 94%, 75%, 88% and 90%, respectively. After chemical precipitation, ion exchange experiments were conducted to improve the quality of wastewater. Optimum dosage and resin type were determined. The experiments revealed that resin I gave the best removal rates for the parameters considered in this study. Study results indicated that the quality of the treated wastewater reached the suggested process water limits of the textile industry.