الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
Phenol and its compounds are highly toxic even in low concentration, and have become the subject of intense research during the last two decades. Effluents from industries such as oil refining, paper milling, olive oil extraction, wood processing, coal gasification and textiles and resin manufacturing and agro-industrial wastes discharge phenols at levels much higher than the toxic levels set for this compound. Advanced Oxidation Processes (AOPs) such as UV, UV-TiO2, UV-H2O2, O3 and UV-O3 have become popular in recent years as efficient treatment methods for recalcitrant compounds like phenol. The present study dealt with the photocatalytic degradation of phenol using TiO2 / UV system in a tubular batch reactor with recycle. The effect of various parameters such as initial concentration of phenol, contact time, catalyst loading, solution pH value, and slurry flow rate on the photodegradation reaction was investigated to achieve maximum degradation efficiency. The results showed that the percentage of removal increases with decreasing pH and the polluted slurry flow rate while decrease with increasing the initial concentration of phenol. Also the percentage of removal increases with increasing the catalyst loading up to 1.5 g/l then decrease with further increasing in the amount of catalyst. The maximum percentage of removal is 82.73% at 25 ppm, pH 1.5, catalyst loading 1.5 g/l and slurry superficial velocity of 2.94 cm.