School of Chemical and Bio Engineering

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Browsing School of Chemical and Bio Engineering by Author "Abeba, Kebede"

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    Treatment of Textile Wastewater Using Titanium Dioxide Photocatalysis to Remove COD and Color
    (Addis Ababa University, 2019-06) Abeba, Kebede; Berhanu, Assefa (Ass. Prof.)
    Textile industry is faced with serious environmental problems associated with its immense wastewater discharge, high BOD, COD, TS, extreme alkalinity and heavily colored effluent. It is discharged without enough treatment above the discharge limit set by EPA which affects the aquatic environment as well as human beings. Therefore, the objective of this study was to reduce COD and color from the textile wastewater by using TiO2 photocatalysis experiment to an acceptable discharge limit. In this study, effect of TiO2 dosage (400-550 mg/l), pH (7-9), and irradiation time (3-5 hr.) were investigated in batch experiment. The influent results revealed that the COD, BOD, TS, TSS, TDS and turbidity of textile wastewater were in concentration of 1150 mg/L, 210.77 mg/L, 2500 mg/L, 850 mg/L, 1650 mg/L and 190 NTU respectively. After TiO2 photocatalytic treatment the effluent resulted at the optimum condition (475 mg/L of TiO2 dosage, pH 9, and irradiation time of 5 hour) for the removal of COD and color showed that 110 mg/L of COD removal which is 90.4% in percent and 88% color removal respectively. When we see the removal of other pollutant load such as BOD, TSS, TDS and turbidity the concentration reduced to 210.77 mg/L, 25 mg/L, 74 mg/L and 22 NTU respectively which shows photocatalytic treatment of textile wastewater is the best treatment choice not only to remove COD and color but also the other pollutant load. Consequently, the experimental result showed that TiO2 photocatalysis is an efficient, cost effective and environmental friendly treatment technology for textile wa