Combination of coagulation-ultraviolet photocatalytic treatment by using zinc oxide with polyarcylamide and tannin for removal of colour
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Date
2019-07
Authors
Wan Nur Azlin Hanis Binti Jumahat
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Abstract
Water is an important component in our daily lives. The presence of toxic chemicals and
harmful bacteria may expose living things to waterborne diseases and has led a major
health risk due to the consumption of contaminated water. Wastewater from the textile
industry is one of the many environmental obstructions besides other minor issues like
solid waste and resource waste management. There are many types of synthetic dyes that
textile industry use and the discharge have massive amounts of highly coloured
wastewater. Wastewater with excessive coloured textile sorely effects the photosynthetic
function in plant and also impact aquatic lives due to low light penetration and
consumption of oxygen. Hence, textile wastewater must be treated properly before being
discharged to the environment. In this study, the different treatment methods to treat the
textile wastewater is presented. The treatment methods discussed in this study are the
coagulation and UV-photocatalytic treatment processes, where both of these methods
have been investigated with a combined method. This study involves the modification
of zinc oxide with polyacrylamide and tannin as a composite polymer to remove the
colour. The objective of this study has been successfully achieved. The modification of
composite polymer is prepared as coagulant and catalyst for both treatment methods and
it is characterized using the Fourier Transform Infrared Spectroscopy (FTIR) method.
The coagulation and photocatalytic activity of ZnO/Tannin/PAM (ZOPAT) using raw
textile wastewater is investigated by optimizing parameters such as the effect of pH
value, dosage and contact time. The optimum percentage of colour removals obtained
for UV-photocatalytic method (93.67%) at 24 hours of treatment period and for
combined method (93.92%) at 4 hours of treatment period were achieved at condition of
pH 10 and 800 mg/L of the composite polymer dosage. The decolourization of textile
wastewater is dependable on the composite polymer used for both treatment methods.