fa <table align="left" cellpadding="0" cellspacing="0" hspace="0" vspace="0"> <tbody> <tr> <td align="left"> <p><strong>Background & Aims of the Study:</strong> There are three different types of fibers used in the manufacture of various textile products: cellulose fibers, protein fibers and synthetic fibers. Textile wastewater discharge into the environment leads to irreparable damages. The main purpose of this study was treatment of textile wastewater, using a combined coagulation and dissolved air flotation (DAF) processes, Iran in 2016.</p> <p><strong>Materials and Methods:</strong> This study was an empirical-lab study which the Jar tests and DAF were used in laboratory scale. After determination of the optimal condition of pH and the optimum of concentration of poly-aluminum chloride by Jar test, the effect of the effective parameters including the concentration of the coagulant (10, 20, 30, 40, 60 mg/L), coagulation time (5, 10, 15 and 20 min), flotation time (5, 10, 15 and 20 sec), saturation pressure ( 3, 3.5, 4 and 4,5 atm) and turbidity ( 10, 20 , 30, 40, 60 NTU) on the removal efficiency of COD, BOD₅ and TSS by DAF were studied.</p> <p><strong>Results:</strong> Results of this study showed that the DAF process can treatment COD, BOD₅ and TSS up to85.7%, 80.68% and 95.6%, respectively. The appropriate condition was as follows: pH=6, initial concentration of aniline= 200 mg/L, flocculation time = 10 min, flotation time= 20 sec and the air pressure= 4 atm. Also, this study indicates that the DAF process to conclusion requires a lower dosage of poly-aluminum chloride.</p> </td> </tr> </tbody> </table> <div style="clear: both;"><strong>Conclusion:</strong> The coagulation and DAF processes can be effective to treat textile wastewater from industries.</div> Dissolved air flotation, Textile wastewater, Industrial Wastewater, polyaluminum chloride, Wastewater Treatment, Iran. 229 234 http://jhygiene.muq.ac.ir/browse.php?a_code=A-10-104-2&slc_lang=fa&sid=1 Shahin Ahmadi sh.ahmadi398@gmail.com Yes Department of Environmental Health, Health Promotion Research Center, School of Health, Zabol University of Medical Sciences, Zabol, Iran Ferdos Kord Mostafapour No Department of Environmental Health, Health Promotion Research Center, School of Health, Zahedan University of Medical Sciences, Zahedan, Iran