Fulvic acid (FA) is a natural organic matter existing in Tianjin surface waters as a major precursor of disinfection byproducts.So fulvic acid control is very important in surface water treatment.Degradation of FA in a photocatalysis-ultrafiltration reactor using TiO2 powder catalyst was studied in terms of UV254 and total organic carbon(TOC)concentration.The key effects of influencing parameters on the photocatalytic oxidation of FA

including pH values

photocatalyst concentration

additives concentration and light intensity were investigated.The results showed the reaction kinetics of FA could be reasonably represented by first-order kinetics.In addition

it was found that there was an optimal catalyst concentration of 0.5 g8226;L-1 and low pH value.Increasing additives concentration and light intensity were favorable for TOC removal.By analyzing the relationship between rate constant and influencing factors

an overall FA oxidation rate kinetic model was established.The theoretical prediction were in good agreement with the experimental data.This reactor was a convenient way to degrade the organic matter with high efficiency.