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Degradation of biotansformation products of nonylphenol ethoxylates by ozonation and UV/TiO2 treatment

Michihiko IkeDepartment of Environmental Engineering, Graduate School of Engineering, Osaka University, 2-1, Yamada-oka, Suita, Osaka 565-0871, JapanMasahiro AsanoDepartment of Environmental Engineering, Graduate School of Engineering, Osaka University, 2-1, Yamada-oka, Suita, Osaka 565-0871, JapanFadila Djouadi BelkadaDepartment of Environmental Engineering, Graduate School of Engineering, Osaka University, 2-1, Yamada-oka, Suita, Osaka 565-0871, JapanShinji TsunoiResearch Center for Environmental Preservation, Osaka University, 2-4, Yamada-oka, Suita, Osaka 565-0871, JapanMinoru TanakaResearch Center for Environmental Preservation, Osaka University, 2-4, Yamada-oka, Suita, Osaka 565-0871, JapanMasanori FujitaDepartment of Environmental Engineering, Graduate School of Engineering, Osaka University, 2-1, Yamada-oka, Suita, Osaka 565-0871, Japan

2002en

ABI

Annotatsiya

The degradation kinetics of biotransformation products of nonylphenol polyethoxylates (NPEOs), nonylphenol (NP), nonylphenol monoethoxylate (NP1EO) and nonylphenoxy carboxylic acid (NP1EC), by ozonation and UV/TiO2 (ultraviolet photocatalytic degradation in the presence of titanium dioxide suspension as a catalyst) were investigated using lab-scale reactors. The degradation rate of NP by UV/TiO2 was the highest among the tested NPEOs metabolites, while NP1EC showed the lowest degradation rate. In contrast, ozonation was especially effective for the breakdown of NP1EC. NP could be also degrade efficiently by ozonation, however, it was much less effective for NP1EO decomposition. Degradation of NP by both chemical oxidation processes followed first-order kinetics. The degradation curves of NP1EO and NP1EC could be approximately described by first-order kinetics also, although the degradation of NP1EC by ozonation seemed to follow a second-order kinetic.

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Identifikatorlar

DOI: 10.2166/wst.2002.0727

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