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Industry has an important role in the development of any country and communities. Textile industry is one of my countries needed (1). The textile industry is classified into three parts: cellulose fibers, protein fibers and synthetic fibers. The type of dyes and chemicals used in the textile industry are depends on the fiber production (2). The textile wastewater has a high color, high BOD/COD and salt (TDS) load. The textile wastewater begotten from cotton dyeing industry is very polluted due to presence of reactive dyes which are not readily amenable to biological treatment (1,3). Thus, Without suitable treatment, discharge of wastewaters into water can Undesirable effects on aquatic environment by reducing light infiltration and photosynthesis; being hazardous and toxic to aquatic life (4,5). The textile wastewater must be properly treated before their discharge to the water resources and the environment (6). There are several methods for the elimination of textile wastewaters, including the application of photo decomposition (7), electrolysis (8), A-R-T-I-C-L-EI-N-F-O A-B-S-T-R-A-C-T Article Notes: Received: Jan. 3, 2017 Received in revised form: Apr. 29, 2017 Accepted: Jun. 21, 2017 Available Online: Jun 28, 2017 Background & Aims of the Study: 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. Materials and Methods: 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. Results: 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. Conclusion: The coagulation and DAF processes can be effective to treat textile wastewater from industries.

Treatment of Textile Wastewater Using a Combined Coagulation and DAF Processes, Iran, 2016