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Removal of Methyl Orange in Aquaculture Water by Spray-Coated Tio2 Photocatalysis

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Removal of Methyl Orange in Aquaculture Water by Spray-Coated Tio2 Photocatalysis

Aquaculture consumes a significant amount of fresh water and also pollutes it. Off-flavor compounds are one of the main concerns in aquaculture water problems. This work is a preliminary exploration of removing off-flavor compounds in aquaculture systems. In this study, methyl orange is a surrogate compound, and photocatalysis is selected as an optimal technology to remove methyl orange in aquaculture wastewater. Titanium dioxide (TiO2) is the essential photocatalyst for the degradation reaction of organic compounds such as methyl orange and offflavor pollutants. In consideration of some unknown effects of TiO2 on fish, immobilizing TiO2 onto a glass plate is an ideal technology. A photodegradation reactor was designed as a recirculating system. In parameter optimization experiments, a flow rate of 2.5 mL/s, a water depth of 2 mm, and a TiO2 dosage of 0.25 mg/cm3 were determined. Through inductively-coupled plasma mass spectrometry (ICP-MS) detection, fixing TiO2 powder onto a glass plate provides a stable system that can be efficiently used in aquaculture systems. Due to the presence of natural organic matter (NOM), the methyl orange removal efficiency in aquaculture water was worse than in deionized water, but still resulted in 93% removal after 6 hours. This indicates that although NOM interferes with the photocatalysis results, if reaction time is extended, acceptable removal efficiencies are achieved. The present work can be applied to a subsequent photocatalysis study on removing off-flavor compounds in aquaculture systems.

Citation: Zhao W, Zhang Y, Gonzalez LR, Zhong F, Ergas SJ, et al. (2015) Removal of Methyl Orange in Aquaculture Water by Spray-Coated Tio2 Photocatalysis. J Chem Eng Process Technol 6:237

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