Investigation of the treatability of industrial textile wastewater with EC, ozone and EC/ ozone hybrid systems

Wastewater from the textile industry contains high concentrations of organic and inorganic chemicals. It has very strong COD, Color, BOD, and suspended solid pollutant properties. Many methods, including physical, chemical, and biological, are used in the treatment of textile wastewater and new methods are still being researched. The aim of this study is to investigate and compare the ozone and electrocoagulation treatment methods separately and in a hybrid way in laboratory scale textile industry wastewater in terms of COD and color removal. In this study, the initial COD value of the raw wastewater sample taken from the textile industry; It measured 1256 mg/L and pH 3.86. pH, conductivity (NaCl amount), current and reaction time were investigated for the removal of COD and color by purification using the electrocoagulation (EC) method. The optimum conditions for COD and color removal were found to be pH 5, 10 minutes, 1g/L NaCl and 0.25 A. Under these conditions, the COD removal was 47%, the color removal was 80% at 436 nm, 98% at 525nm, and 99% at 620nm. In the treatment with ozone (O3), pH, O3 dose and reaction time were studied. In purification with this method; 2400 mg/L O3 dose and 180 minutes were determined as optimum without changing the raw water pH. Under these conditions, the COD removal was 53%, the color removal was 97% at 436 nm, 99% at 525nm, and 99% at 620nm. As a result of the optimum pH 3, 1800 mg/L O3, 1g/L NaCl conditions determined in the EC+O3 process, the COD removal was 83%, the color removal was 94% at 436 nm, 96% at 525nm, and 97% at 620nm. In the ECO3 method, on the other hand, in 75 minutes and pH 5 conditions, the removal of COD was 61% and the color removal was 98% at 436 nm, 99% at 525 nm and 99% at 620 nm.