Treatment of Wastewater Containing Acid Orange 7 Using Ozonation Process and Determination of the Intermediate By-products
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...
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Water and Wastewater Consulting Engineers Research Development
2015-05-01
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doaj-8fdea6f1ec084bab8959ff624f53650a2021-03-02T08:16:20ZengWater and Wastewater Consulting Engineers Research Developmentآب و فاضلاب1024-59362383-09052015-05-0126213237935Treatment of Wastewater Containing Acid Orange 7 Using Ozonation Process and Determination of the Intermediate By-productsFarhad Ghaderi- Zafrei0Bita Ayati1Hossein Ganjidoost2Rasool Sarraf Mamoori3PhD Student of Environmental Engineering, Dept. of Civil and Environmental Engineering, Tarbiat Modarres University, TehranAssoc. Prof. of Environmental Engineering, Dept. of Civil and Environmental Engineering, Tarbiat Modarres University, TehranProf. of Environmental Engineering, Dept. of Civil and Environmental Engineering, Tarbiat Modarres University, TehranAssoc. Prof. of Ceramics, Dept. of Materials Engineering, Faculty of Engineering, Tarbiat Modarres University, TehranIn 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.http://www.wwjournal.ir/article_7935_afb44580ac03f3ae92278ebf67097698.pdfAzoCODLight AbsorbancepHConcentration |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Farhad Ghaderi- Zafrei Bita Ayati Hossein Ganjidoost Rasool Sarraf Mamoori |
spellingShingle |
Farhad Ghaderi- Zafrei Bita Ayati Hossein Ganjidoost Rasool Sarraf Mamoori Treatment of Wastewater Containing Acid Orange 7 Using Ozonation Process and Determination of the Intermediate By-products آب و فاضلاب Azo COD Light Absorbance pH Concentration |
author_facet |
Farhad Ghaderi- Zafrei Bita Ayati Hossein Ganjidoost Rasool Sarraf Mamoori |
author_sort |
Farhad Ghaderi- Zafrei |
title |
Treatment of Wastewater Containing Acid Orange 7 Using Ozonation Process and Determination of the Intermediate By-products |
title_short |
Treatment of Wastewater Containing Acid Orange 7 Using Ozonation Process and Determination of the Intermediate By-products |
title_full |
Treatment of Wastewater Containing Acid Orange 7 Using Ozonation Process and Determination of the Intermediate By-products |
title_fullStr |
Treatment of Wastewater Containing Acid Orange 7 Using Ozonation Process and Determination of the Intermediate By-products |
title_full_unstemmed |
Treatment of Wastewater Containing Acid Orange 7 Using Ozonation Process and Determination of the Intermediate By-products |
title_sort |
treatment of wastewater containing acid orange 7 using ozonation process and determination of the intermediate by-products |
publisher |
Water and Wastewater Consulting Engineers Research Development |
series |
آب و فاضلاب |
issn |
1024-5936 2383-0905 |
publishDate |
2015-05-01 |
description |
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. |
topic |
Azo COD Light Absorbance pH Concentration |
url |
http://www.wwjournal.ir/article_7935_afb44580ac03f3ae92278ebf67097698.pdf |
work_keys_str_mv |
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