REMOVAL OF BASIC DYE FROM TEXTILE WASTEWATER BY APPLYING ADVANCED OXIDATION PROCESSES USING FENTON REAGENT
Creators: name: KUMLACHEW AKELE ZEWDIE
Publisher: name: National Academic Digital Repository of Ethiopia
Year: 2019
Subjects: Declorization, COD, BOD, TS, Turbidity, Fenton, Advanced Oxidation Process, and Industrial Effluents

description: Environmental problems of textile industries are mainly caused by discharges of wastewater. The textile sector has a high-water demand and generation of coloured pollutants. The wastewater has different compositions and concentrations of pollutants, and the dyeing wastewater has intense colour. Most of the manufacturing sectors in Ethiopia use imported raw yarn for the production of different colour yarn using different dying technology. Wastewater produced from this activity may cause damage to the quality of the receiving water bodies, (the aquatic ecosystem) and there environmental components.<br> The removal of dyes from effluents is required, but because of the high cost and in efficient processes of conventional methods of dye removal, Ketema Kebede textile factories directly discharging their partially treated wastewater into their nearby streams. The efficiency of colour removal depended on the type of wastewater and concentration of pollutants contained within the stream. The main objective of this study is to remove blue nine basic dyes from textile wastewater by applying advanced oxidation processes using Fenton reagents.<br> The effects of advanced oxidation process in dye removal, effects of wastewater type, pollutant concentrations, pH of the solution and amount of oxidizing agents, in particular of hydrogen peroxide, on the yield of decomposition of dyes during Fenton reaction were investigated.<br> The experimental parameters and number of experiments were determined using design expert software. The effects of the experimental parameters such as dye dosage and, time on colour removal on the simulated wastewater was investigated. Maximum removal<br> <br> efficiency of 94.60 % were observed at pH of 3, initial concentration of 100 mg/L and reaction time of 30 min. Through ANOVA analysis, it was found that pH has significant effect on the colour removal efficiency than the remaining factor. After oxidation process of real wastewater, colour removal efficiency of 76.30% was observed at optimum operating conditions, (pH of 3 and reaction time of 30 min.), [and the chemical, biological and physical properties of real textile wastewater sample of COD, BOD, Total Solid, Turbidity of obtained 24 mg/l, 2.5 mg/l, 38.1 mg/l, 22 NTU,)] respectively. The decolourization efficiency of real wastewater result was lower than the removal efficiency of synthetic wastewater at the same experimental conditions. This might be due to the presence other contaminant like heavy metals and organic compounds in the solution, which may reduce the efficiency of oxidization process.<br> Further researh recommended on focuse the effect of mixing speed and the different oxidant dosage and on decrease the range of point selection for imprtant parameters in order to get less variance of data distribution in the declorization activity.