Treatment of winery wastewater using a photocatalytic/photolytic reactor

Abstract In this study, an annular photocatalytic/photolytic reactor system was designed to investigate remediation of winery wastewater. The performance of the reactor was studied as a functional of various operating variables, such as gas flow rate, pH and catalyst loading. It was found that the optimum gas flow rate was 6 L/min whereas the optimum pH value is 6.5. The highest photodegradation rate and the maximum COD removal were achieved at zero catalyst loading with COD removal of about 84%. Lower rates of chemical reaction in photocatalysis compared to photolysis were possibly because of the shielding of UV light by titania particles. This hypothesis was confirmed by conducting further experiments with inert glass beads where the reaction rate decreased with particle loading in an identical manner.

[1]  Nick Serpone,et al.  Photocatalyzed destruction of water contaminants , 1991 .

[2]  R. Faure,et al.  Photocatalysed degradation of cyromazine in aqueous titanium dioxide suspensions: comparison with photolysis. , 2001 .

[3]  M. Dhananjeyan,et al.  An investigation on TiO2-assisted photo-oxidation of thymine , 1996 .

[4]  M. Stenstrom,et al.  Degradation mechanism and the toxicity assessment in TiO2 photocatalysis and photolysis of parathion. , 2006, Chemosphere.

[5]  Federico Federici,et al.  Aerobic treatment of winery wastewater using a jet-loop activated sludge reactor , 2002 .

[6]  Brent R. Young,et al.  Computational fluid dynamic (CFD) simulation of a pilot-scale annular bubble column photocatalytic reactor , 2003 .

[7]  F. Javier Rivas,et al.  Comparison between photocatalytic ozonation and other oxidation processes for the removal of phenols from water , 2005 .

[8]  H. Lasa,et al.  Photocatalytic reaction engineering , 2005 .

[9]  V. G. Pangarkar,et al.  Photocatalytic degradation of para-hydroxybenzoic acid: Relationship between substrate adsorption and photocatalytic degradation , 2000 .

[10]  M. Viljoen-Bloom,et al.  Microbiology of a biological contactor for winery wastewater treatment. , 2003, Water research.

[11]  Vishwas G. Pangarkar,et al.  Photocatalytic degradation for environmental applications – a review , 2002 .

[12]  Ha Ming Ang,et al.  A REVIEW OF SYNERGISTIC EFFECT OF PHOTOCATALYSIS AND OZONATION ON WASTEWATER TREATMENT , 2005 .

[13]  J. Bayona,et al.  Photolysis of PAHs in aqueous phase by UV irradiation. , 2001, Chemosphere.

[14]  F. Federici,et al.  High-rate aerobic treatment of winery wastewater using bioreactors with free and immobilized activated sludge. , 2000, Journal of bioscience and bioengineering.

[15]  E. Lipczynska-Kochany,et al.  Flash photolysis/high-performance liquid chromatography method for studying the sequence of photochemical reactions : direct photolysis of phenol , 1992 .

[16]  J. Crittenden,et al.  Heterogeneous photocatalytic oxidation of hazardous organic contaminants in water , 1993 .

[17]  Ruey-an Doong,et al.  Photodegradation of parathion in aqueous titanium dioxide and zero valent iron solutions in the presence of hydrogen peroxide , 1998 .

[18]  A. E. Greenberg,et al.  Standard methods for the examination of water and wastewater : supplement to the sixteenth edition , 1988 .

[19]  C. Wan,et al.  Heterogeneous photocatalytic oxidation of phenol with titanium dioxide powders , 1991 .

[20]  Y. Ku,et al.  Effect of Solution pH on the Hydrolysis and Photolysis of Diazinon in Aqueous Solution , 1998 .

[21]  M. D. Fumi,et al.  Optimisation of long-term activated-sludge treatment of winery wastewater , 1995 .