Abstract:
This work was carried out to decrease color, COD and BOD in wastewater from textile industry by using the photo-Fenton oxidation process in continuous stirred tank reactor. The experiment was separated into two parts. The first part was to study the effect of parameters including feed rate of H [subscript2] O[subscript2] (5-25 ml/min), feed rate of [superscript2]+ (0-5 ml/min) and UV power (365 nm, 0-60 w) on the reduction of color, COD and BOD by 2[superscript k] factorial design experiment. The initial pH of wastewater and its feed rate were maintained constant at 7-8 and 1/min, respectively. The preliminarily results indicated that feed rate of both H[subscript2] O[subscript2] and Fe[superscript2+] had significant effect on the reduction of color and BOD which led to decrease approximately 40-50% and 40-80-% of color and BOD, respectively. For COD, no parameters in the investigated range had effect on its reduction percentages. The second part was carried out to investigate the effects of parameters fortreating textile wastewater in continuous process. The optimum condition was found at UV power of 90 W, initial pH of wastewater of 5, feed rate of Fe[superscript2+] of 5 ml/min and feed rate of H[subscript2]O[subscript2] of 25 ml/min. By employing such condition, approximately 69.2%, 99.4% and 45.5% of color, BOD and COD were reduced, respectively.