Treatment of Textile Wastewater Using Titanium Dioxide Photocatalysis to Remove COD and Color
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Date
2019-06
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Addis Ababa University
Abstract
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
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Keywords
Textile wastewater, COD, Color, TiO2 Photocatalysis