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Issue
Korean Journal of Chemical Engineering,
Vol.25, No.4, 663-669, 2008
A continuous photocatalysis system in the degradation of herbicide
Areerachakul N, Vigneswaran S, Ngo HH, Kandasamy J
The performance of both batch and continuous photo-catalytic reactors was studied to evaluate their capabilities in removing the sulfonyl urea herbicide of metsulfuron methyl (MM). It was found in a batch reactor that the addition of a small amount of powder activated carbon (PAC) significantly increased the rate of degradation of MM. The continuous photo-catalytic system resulted in 57% of MM removal. When a small dose of activated carbon was added in the photo-catalytic system, MM removal increased to 78-86% MM removal for retention times between of 5.25-21 min (corresponding to withdrawal rates of 10-40 mLmin.1). In this study, the pseudo first order rate constants of a continuous photo-catalytic system revealed that shorter retention times were associated with lower rate constants. Solid phase micro extraction/gas chromatography (SPME/GC) results showed that high concentrations of MM were broken down to small volatile organic compounds (VOCs) by photo-catalytic oxidation. PAC adsorbed the photo-products and increased the degradation of MM.
Keywords: Metsulfuron Methyl; Heterogeneous Photocatalysis; Powder Activated Carbon; Batch Photo-catalytic Reactor; Continuous Photo-catalytic Reactor
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