:: Volume 6, Number 3 (Summer 2017) ::
Arch Hyg Sci 2017, 6(3): 229-234 Back to browse issues page
Treatment of Textile Wastewater Using a Combined Coagulation and DAF Processes, Iran, 2016
Shahin Ahmadi *, Ferdos Kord Mostafapour
Department of Environmental Health, Health Promotion Research Center, School of Health, Zabol University of Medical Sciences, Zabol, Iran
Abstract:   (439 Views)

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.
Keywords: Dissolved air flotation, Textile wastewater, Industrial Wastewater, polyaluminum chloride, Wastewater Treatment, Iran.
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Received: 2017/01/3 | Accepted: 2017/04/29 | Published: 2017/06/28



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Volume 6, Number 3 (Summer 2017) Back to browse issues page