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Paper Information

Journal:   WATER AND WASTEWATER   2015 , Volume 26 , Number 2 (96); Page(s) 13 To 22.
 
Paper: 

TREATMENT OF WASTEWATER CONTAINING ACID ORANGE 7 USING OZONATION PROCESS AND DETERMINATION OF THE INTERMEDIATE BY-PRODUCTS

 
 
Author(s):  GHADERI ZAFREI FARHAD, AYATI BITA*, GANJIDOUST HOSSEIN, SARAF MAMORI RASOL
 
* DEPT. OF CIVIL AND ENVIRONMENTAL ENGINEERING, TARBIAT MODARRES UNIVERSITY, TEHRAN
 
Abstract: 

In this research, ozonation was used for treating wastewater containing acid orange 7 in a batch reactor. The independent parameters were initial dye concentration, pH, and ozone mass and volumetric flow rates. The experiments were conducted with initial concentration in the range of 5-250 mg/L, pH levels of 4-12, ozone mass flow rates of 12 and 20 mg/min, and volumetric flow rates of 0.5 and 1 L/min. Based on the results, the optimum conditions were achieved at a dye concentration of 100 mg/L, a pH level of 11, an ozone mass flow rate of 20 mg/min, and an ozone volumetric flow rate of 1 L/min. Dye and COD removal efficiencies in these conditions were 100% and 30%, respectively, after 150 minutes. According to the absorbance curves, light absorbance of wastewater increased by 100% in the range of 450-500 nm by ozonation under the optimum conditions after dye removal. Based on the GC-Mass test and the values of LD50, acid orange 7 was converted to toxic compounds of aniline, 1-naphthylamine, 2-naphthol, and 1, 4-naphthalenediol indicating that ozonation had to be continued until complete COD removal. Based on the Taguchi experimental design data for real textile wastewater, the optimum conditions were obtained for a pH level of 11, a gas flow rate of 1 L/min, and an ozonation injection rate of 20 mg/min.

 
Keyword(s): AZO, COD, LIGHT ABSORBANCE, PH, CONCENTRATION
 
References: 
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